411 Series Digital Communicators (411/411UD/411UDAC)

4X Series (MS-4424, MS-4412B, MS-4424B, MRP-4424)

Batteries and Battery Chargers

FCPS-24F Field Charger Power Supply

FCPS24FS6 Field Charger Power Supply with Built in NAC Synchronization

FCPS-2404 Field Charger Power Supply

MS-5012 Fire Alarm Control Panel

MS-5024 and MS-5024UD Fire Alarm Control Panels

MS-5210UD Fire Alarm Control Panel

Sensiscan 200 Fire Alarm Control Panel

Sensiscan 2000 Fire Alarm Control Panel

UDACT-F Digital Communicator/Transmitter
MS-5/10

411 Series

Dialer Runaway feature on 411 Series communicators

When a control panel encounters a large number of trouble conditions within a certain timeframe, and its digital communicator bombards the Central Station with phone calls, it is considered Dialer Runaway. The 411 Series Digital Communicators feature the ability to understand this condition and stop the repetitive dialing after 20 trouble incidents.

See Also: 411 Digital Alarm Communicator Transmitter Manual

The piezo sounds on the 411 DACT with no COMM FAIL light on

The following DACT troubles include:

• Input channel open circuits
• Phone Line 1 or 2 Voltage Fault
• Phone Number 1 or 2 Communication Fail with Comm Fail LED on
• Total communications fail or communications disabled.

See Also: 411 Digital Alarm Communicator Transmitter Manual

Powering up the 411 DACT annunciates a Trouble

The 411 DACT defaults to "Communications Disabled" at Address 64, which causes a trouble at power up. This is completely normal.

See Also: 411 Digital Alarm Communicator Transmitter Manual

411 and 411UD Does not Power Up

When using a 12-volt FACP to power a 411 DACT, the dialer doesn't power up—even though power is attached correctly. To fix:

1. Check Jumper J4 on the 411/411UD to configure the DACT for its operating voltage
2. For 24 VDC: remove the jumper; For 12 VDC: leave the jumper in place.

See Also: 411 Digital Alarm Communicator Transmitter Manual and 411UD Digital Alarm Communicator Transmitter Manual

411 DACT manual:  Silence button not pictured

The latest version of the 411 DACT has a button for silencing local trouble signals.

See also: 411 Digital Alarm Communicator Transmitter Manual

How to return a 411 DACT to default programming

1. Press the Mode key, enter "3337", and then press Enter.
2. Within 5 seconds, press the Mode key, enter "3337", and then press Enter.

When reprogramming is complete, the display goes blank.

4X Series (MS-4424, MS-4412B, MS-4424B, MRP-4424)

Using the 4XZMF zone relay module with MS-4424 activates of the relays on the module

When using the 4XZMF zone relay module, the relays activate when the initiating zone activates: Zone 1 trips relay 1, Zone 2 trips relay 2, Zone 3 trips relay 3, and Zone 4 trips relay 4. Any zone programmed for alarm will activate its associated relay and the general alarm relay on the 4XZMF. Any trouble condition on the panel activates the general trouble relay on the module.

Note: If zone 4 is programmed as a Supervisory zone it will activate Relay 4 on the module, but not the general alarm or general trouble relay.

See Also: MS-4424 Instruction Manual

4XZM: Activating Relays 3 and 4

Using a 4XZM, how can I get relays 3 and 4 to activate with outputs 3 and 4 when the control panel only has two NAC Circuits?

When using the 4XZMF zone relay module, the relays will activate when the initiating zone activates: Zone 1 trips Relay 1, Zone 2 trips Relay 2, Zone 3 trips Relay 3, and Zone 4 trips Relay 4. Any zone programmed for alarm will activate its associated relay, and the general alarm relay on the 4XZMF. Any trouble condition on the panel will activate the general trouble relay on the module. Note: If Zone 4 has been programmed as a Supervisory zone, it will activate Relay 4 on the module, but not the General Alarm or System Trouble relay.

See Also: MS-4424 Instruction Manual

MS-4412B/4424B: Zone 4 set as a Supervisory input and Notification Appliance Circuits Activate

If Zone 4 is set as a Supervisory input, both Notification Appliance Circuits will activate for Supervisory conditions. To activate only one Notification Appliance Circuit (Circuit 2), cut SUPV 1 jumper. To disable both Notification Appliance Circuits from activating on a Supervisory, cut SUPV 2 jumper. Refer to the manual for jumper location.

See Also: MS-4424 Instruction Manual

Batteries and Chargers

How long does it take for the CHG-120F to fully-charge completely-discharged batteries?

CHG-120F can recharge as follows:

• 25 AH batteries in 9 hours
• 55 AH batteries in 20 hours
• 120 AH batteries in 38 hours

See Also: CHG-120F Manual

How to Connect two 100 AH batteries to the CHG-120F

Refer to instructions in the CHG-120 Series Addendum.

How to use a remote battery charger with a particular control panel

To use a remote battery charger with a control panel, you must be able to disable the control panel's onboard battery charger. For more information, refer to the control panel manual.

Getting a "No Bat" message with batteries connected to the panel

A "Lo Bat" message is generated when the battery voltage drops below 20.4 volts.

Connecting two sets of batteries to double the amp-hours

On a 24 VDC control panel, you normally use two 12-volt batteries connected in series. To double the amp-hour capacity of your secondary power source, you have to connect two sets of series-connected batteries in parallel. This doubles the amp-hours. Before you do this, be advised of the following:

• Factory Mutual (FM) does not recognize (thereby voiding FM approval of the system) series-parallel battery connections.
• Make sure the battery charger is capable of adequately charging the total amp-hours.
• Do not mix batteries of different voltages (6, 12, or 24), amp-hours or age (old and new). Always use four identical batteries in this scheme.
• Make sure you can supply an adequate housing for the four batteries.

Battery Calculations

The data sheet for the notification appliances I want to use lists two alarm current draws—regulated and FWR. Which value do I use for battery calculations? My NAC supply is FWR.

Use the regulated current draw for your notification appliances because the battery is the perfect filter—it provides straight, clean DC. If your NAC supply is FWR (Full-Wave Rectified) and you are doing supply calculations to ensure that you do not overload the power supply in alarm while operating on AC, use the unfiltered current draw.

See Also: Battery Calculations and Manuals.

How to test the charger output to see if the charger is working

Most questions of charger integrity stem from the existence of a trouble condition. The system indicates a battery trouble or display a "LO BAT" or "NO BAT" message. The vast majority of times, failing batteries are the cause of these troubles. Batteries have a limited life and must be replaced regularly.

The easiest and most useful way to test the charger functioning on any fire panel is to install a known good set of batteries in the system, let them charge up 24-30 hours, and then disconnect AC and run a load test. Beyond this, there is no simple way to test the battery charger of a Fire-Lite control panel.

The MS-9600/MS-9600LS displays the charger output voltage in its Read Status function. Alternately, you can test if the charger is basically functioning by measuring the voltage across the batteries with a digital voltmeter (DVM). If the voltage fluctuates in the millivolt range (regardless of the actual value), the charger is functioning. This is because the output of the charger is pulsed (not steady DC).

FCPS-24F

How to configure the FCPS-24F with a Nonresettable Power Output

On the FCPS-24F, can I have two circuits activate notification appliances and the two remaining circuits supply a steady 24 volts?

All four circuits are factory set as Notification Appliance Circuits (NACs). Alternately, circuits 2 and 4 can be nonresettable power outputs. To change circuit 2 to a nonresettable power circuit, cut R175. To change circuit 4 to nonresettable, cut R176.

See Also: FCPS-24F Drawing and FCPS-24F Manual

Can the inputs of an FCPS-24F be activated by a NAC circuit that has a System Sensor MDL module on it?

Yes, but the Synch signal will not be transferred from the inputs of the FCPS-24F to the outputs so the FCPS-24F NACs will not be synchronized. Furthermore, some distortion of the audible signal may occur, particularly with a steady DC NAC signal.

For full synchronization, install a slave MDL module on the outputs of the FCPS-24 and synchronize it with a master MDL module. However, do not daisy-chain the FCPS-24F outputs in this case. Note: The inputs on the FCPS-24F can be activated by 9-32 VDC filtered or unfiltered.

Alternately, consider the FCPS-2404 (4 amp/1 NAC) which will transparently transfer a synchronized signal from an MDL module though to its output.

See Also: FCPS-24F Drawing and FCPS-24F Manual

Can I use a synchronization module with any manufacturer's notification appliance?

No. The notification appliances and the synchronization module(s) have to be specfically designed to work with each other. System Sensor, Wheelock, and Gentex manufacture synchronization modules to work exclusively with their own appliances. Refer to each manufacturer for more information.

See Also: System Sensor Web Site

Amp/Volt meter for the FCPS-24F

The part number for the Amp/Volt meter is MPM-4F. The meter mounts in the lower left-hand corner of the FCPS-24 cabinet and connects to the circuit board with a cable that is provided with the meter.

See Also: FCPS-24F Drawing and FCPS-24F Manual

FCPS-24FS 6/8

Connecting Two or More Power Supplies in Sync

The Sync source Panel or first FCPS-24FS 6/8 in a series of 2 or more should be set as a Sync Generator or "Master." Use one of the output circuits off the "Master" FCPS-24FS 6/8 to trip the second power supply. The second power supply and all others after it will all be configured as "Sync Followers" or "Slaves".

See Also: FCPS-FS6 & FS8 Field Charger Power Supplies Manual

Configure a Nonresettable Power Output

On the FCPS-24FS 6/8, can I have two circuits activate notification appliances and the two remaining circuits supply a steady 24 volts?

All four circuits are factory set as Notification Appliance Circuits (NACs). You can also use Split Alarm Mode, the auxiliary power from terminals 9 and 10, and feed them into terminals 7 and 8 observing the proper polarity. This will activate Outputs 3 and 4 continuously.

See Also: FCPS-FS6 & FS8 Field Charger Power Supplies Manual

Activating FCPS-24FS 6/8 Inputs by a NAC circuit connected to a System Sensor MDL Synch module

For the FCPS-24FS 6/8 to follow the sync signal, you must jumper the NAC input trigger to Sync In+ and Sync In – (jump terminals 3 to 1 & 4 to 2 on TB4) and set Dip Switch 3 to On, which makes the power supply a "Sync Follower" or "Slave." The outputs of the FCPS-24FS 6/8 NACs will now be synchronized with the circuit used to activate it.

Note: When using a NAC that is unfiltered, the outputs of the FCPS-24F S6/8 will sync with one another but may not sync with the synched circuit used to activate the power supply.

Also consider the FCPS-2404 (4 amp/1 NAC) which will transparently transfer a synchronized signal from an MDL module though to its output.

See Also: FCPS-FS6 & FS8 Field Charger Power Supplies Manual

Using a synchronization module with any manufacturer's notification appliance

Notification appliances and the synchronization module(s) must be designed specifically to work with each other. System Sensor, Wheelock, and Gentex manufacture synchronization modules to work exclusively with their own appliances. Refer to each manufacturer for more information.

See Also: System Sensor Web Site

Synchronize Gentex notification devices (horns, strobes, horn/strobes or mini-horns) with the outputs of an FCPS-24FS 6/8

The FCPS-24FS 6/8 uses the Gentex Commander 2 synchronization protocol. If the Gentex devices do not use this protocol, they may not operate properly. To correct this problem, disable the synchronization output of the FCPS-24FS 6/8 by setting dip switches 1 and 2 to the OFF position. Next, install the necessary Gentex Sync Module. (Consult Gentex for the proper sync module.)

FCPS-2404

How is the FCPS-2404 supervised?

The output circuit is supervised by the FCPS-2404 Notification Appliance Circuit's End-of-line resistor.

See Also: FCPS-2404 Manual

Will coded signals pass through the FCPS-2404?

A coded (e.g. ANSI Temporal) NAC circuit can be used to drive the FCPS-2404 the power supply will repeat the code.

Note: JP10 (External Strobe Sync Feature) must be positioned in the DISABLED position (left two pins jumpered) to support coded signals. Refer to the FCPS-2404 manual.

See Also: FCPS-2404 Manual

How many FCPS-2404s may be daisy-chained together?

You can connect (daisy-chain) up to four FCPS-2404s.

See Also: FCPS-2404 Manual

Mounting Sync or Control Modules in a FCSP-2404 cabinet

The optional hardware kit (part number 90273) allows for mounting of two control modules or one control module and one sync module.

See Also: FCPS-2404 Manual

MS-5012

Perform Basic Programming on the MS-5012

To leave one mode, you have to go into another mode, including a return to normal operation from any other mode. To accomplish this, press the Mode key followed the code that represents the mode of operation desired. For instance, to return to normal mode from programming mode, press the Mode key, enter 6676, and then press ENTER/STORE.

Mode entry codes are:

See Also: MS-5012 Manual

Phone Line Faults: PH_1, PH_2, no_1, no_2

Note: All Fire-Lite communicators come factory defaulted to send a 24-hr test report to each number (Primary and Secondary) each day, MAKE sure the test times are programmed for at least 15 minutes of separation.

See Also: UDACT-F Instruction Manual

How to Do Step Through the program

You can step through programming with the Up/Down arrow keys or the Enter/Store key, BUT, if you have changed or deleted any of the Primary or Secondary phone number factory default event codes, pressing enter while scrolling though addresses 16, 42, and 56 will default the event codes back to factory settings.

See Also: MS-5012 Manual and MS-5024/MS-5024E Manual

How to Change Phone Numbers and Transmission Codes

The telephone number and/or transmission codes cannot be changed while the dialer is communicating with the central station. Enter programming mode and allow the panel to dial the central station and receive a "kiss off" and release the phone line. After this occurs, the information may be changed.

DO NOT attempt to disable the dialer in programming by entering a zero in field 56.

Applies to MS-5024, 5024UD, 5210UD etc.

Enabling the Communicator to Communicate with a Central Station

The MS-5012 comes factory defaulted with address 56 programmed as a "0", for Fire Panel only operation. For the panel to communicate, address 56 would have to be programmed with a "1", for a slave communicator operation, or a "2" for Fire panel/communicator operation.

Applies to MS-5024, 5024UD, 5210UD

Can the control panel be powered up on batteries only?

No. It is not possible to power up any of these panels on batteries alone—AC power must be applied first.

How many zones on the MS-5012 can support 2-wire smoke detectors?

Zone 2 and Zone 3 are the only zones on the MS-5012 that can support 2-wire smoke detectors. For Zone 3 to support 2-wire smoke detectors address, program 52 with a "2" and wire the zone for NFPA Style B.

Upon activation of zone 2, the display reads A2 but the MS-5012 is sending a "FF" and an "EF" for restoral.

When address #56 is programmed as a "1" for Slave Communicator enabled, the reporting codes are altered for zone #2 to send a TROUBLE condition, "FF" and "EF". Refer to Chapter 6 (Slave Communicator Configuration) in the 5012 Manual.

MS-5024 and MS-5024UD

How to perform basic programming on the MS-5024 (UD)

To leave one mode, you have to go into another mode, including a return to normal operation from any other mode. To accomplish this, press the Mode key followed by the code that represents the desired mode of operation. For example, to return to normal mode from programming mode: press the Mode key, enter 6676, and then press ENTER/STORE. Mode entry codes are:

Phone Line Faults: PH_1, PH_2, no_1, no_2

NOTE: All Fire-Lite communicators come factory defaulted to send a 24-hr test report to each number (Primary and Secondary) each day, MAKE sure the test times are programmed for at least 15 minutes of separation.

See Also: UDACT-F Instruction Manual

How to step through the program

You can step through programming with the Up/Down arrow keys or the Enter/Store key, BUT, if you have changed or deleted any of the Primary or Secondary phone number factory default event codes, pressing enter while scrolling though addresses 16, 42, and 56 will default the event codes back to factory settings.

See Also: MS-5024/MS-5024E Manual

How to Change Phone Numbers and Transmission Codes

The telephone number and/or transmission codes cannot be changed while the dialer is communicating with the central station. Enter programming mode and allow the panel to dial the central station and receive a "kiss off" and release the phone line. After this occurs, the information may be changed.

Note: DO NOT attempt to disable the dialer in programming by entering a zero in field 56.

Applies to MS-5024, 5024UD, 5210UD

How to Program Test Times

When programming the times to test to the central station, use addresses 21-24 to set the Primary time and use addresses 47-50 to set the Secondary time. The time you set for the Primary test time should be at least 15 minutes apart from the Secondary test time becPrimary and the Secondary information is transmitted over the same incoming telephone line. If this procedure is not followed, either the Primary or the Secondary central station telephone numbers could FAIL to communicate and the panel will display PH_1 or PH_2.

Enabling the Communicator to Communicate with a Central Station

The MS-5012 comes factory defaulted with address 56 programmed as a "0" for Fire Panel only operation. For the panel to communicate, program address 56 with a "1" for slave communicator operation or a "2" for Fire panel/communicator operation.

Applies to MS-5024, 5024UD, 5210UD

PK-5024UD Software Compatibility with Windows 95, XP, 2000

Earlier versions of his software did not operate on Windows 95. Version 1.4 (and higher) is Windows 95 compatible. Version 4.0 is compatible with Windows 2000 and Windows XP.

See Also: PK-5024UD Remote Upload/Download Software Manual

Difference between the MS-5024 and the MS-5024UD

The MS-5024UD has upload/download programming functionality —the MS-5024 does not.

See Also: MS-5024/MS-5024E Fire Control Communicator Manual

Supervising the ADM-24 Supervision

After installing the ADM-24 and wiring the RZA-5F, the panel does not recognize or supervise the keypad. Address 78 needs to be programmed to a "1" for the panel to recognize and supervise the annunciator.

See Also: MS-5024/MS-5024E Fire Control Communicator Manual

Activation of a "Supervisory" zone sends a different code than shown in the Event Code table.

When ANY zone is programmed as a "SUPERVISORY", the event code for that zone is automatically changed from a "1" for alarm to an "8" for supervisory.

Example: Panel is programmed for a 4+2 format; Zone #4 is programmed for Supervisory. Activation of zone #4 will display "SUP 4" on the panel and the code sent will be an "84" instead of a "14".

See Also: Programming section of the MS-5024/MS-5024E Fire Control Communicator Manual

MS-5012

How to Perform Basic Programming on the MS-5210UD

To leave one mode, you have to go into another mode, including a return to normal operation from any other mode. To do this, press the Mode key followed by the code that represents the desired mode of operation. For example, to return to normal mode from programming mode: press the Mode key, enter 6676, and then press ENTER/STORE. Mode entry codes are:

How Select Programming Mode

To get into programming: Press Mode, then 7764, then Enter/Store, then select the level of programming you need: P"1" = Level 1, P"2" = Level 2, P"3" = Level 3, P"4" = Level 4. To exit programming back to Normal mode, Press Mode, 6676, Enter/Store.

Phone Line Faults: PH_1, PH_2, no_1, no_2

Note: All Fire-Lite communicators are shipped with a factory default to send a 24-hr test report to Primary and Secondary Central Station Phone Number daily. Make sure the test times are programmed for at least 15 minutes of separation.

See Also: UDACT-F Instruction Manual

Adding Annunciators Causes all Trouble LEDs to Flash

When adding an LED-10 or AFM-series annunciator, all the trouble LEDs flash. To fix, enable the annunciator in Level 3 programming (P3) of the MS-5210UD.

MS-5210: Can I Change the Enter/Exit codes?

No. You cannot change Enter/Exit codes.

Cannot Save Program Changes

Typically, this can occur if you do not correctly step through the program (for example, using the ENTER key). To correctly step through or review the program, use the Up and Down arrow keys. Only use the Enter key when making changes to the program.

How to Change Phone Numbers and Transmission Codes

The telephone number and/or transmission codes cannot be changed while the dialer is communicating with the central station. Enter programming mode and allow the panel to dial the central station and receive a "kiss off" and release the phone line. After this occurs, the information may be changed.

DO NOT attempt to disable the dialer in programming by entering a zero in field 56.

Standard Relays on the MS-5210UD board

The MS-5210UD ships with a Normally Open (NO) general alarm contact and a Normally Closed (NC) general trouble relay. These relays are programmable for general panel conditions (Alarm, trouble, supervisory, comm fail, process monitor) only-not for specific zones. Note: If you need Form-C (Common, NO, and NC) relays, use the optional NAC-REM module or ACM-8RF module. The ACM-8RF module can be used to follow zones.

How to Increase NAC Power

The only way to increase NAC power is using a remote supply such as the FCPS-24FS 6/8. Note: It is not possible to increase the output of the Notification Appliance Circuits using the APS-6RF.

Powering up on Batteries

You cannot power up the control panel with batteries only. You must apply AC power first to power up the control panel.

Sensiscan 200 and Sensiscan 2000

CPU-2000 indicates a trouble

The CPU-500 indicates a trouble by illuminating the AC, System Alarm, Supervisory, and System Trouble LEDs.

Some Notification Appliance Circuits Don't activate during Walk Test

Walk Test only activates Notification Appliance Circuits programmed as "silenceable".

How to Enter Walk Test Mode

1. Plug in the programming key
2. Press "123-1233
3. Press ENTER twice. Note: If you do not press Enter twice, Walk Test will not function properly.

Info: CPU 2000 NAC fuse ratings

F1 and F2 are part of the protection circuitry for Indicating Circuits one and two on the CPU. They are rated at A4, 125V.

Remote Switch Functions

You can program remote switch functions to perform Reset, Acknowledge, Signal Silence, Emergency Alert, and Pre-signal Inhibit from the IZ-8F card.

• Use circuits 1, 5, 6, 7, and 8 to perform these functions.
• Program he selected circuit must be programmed as a supervisory and non-alarm point.
• The circuits will act as panel points, performing the desired function when the end-of-line resistor is shorted.

Workaround for CPU Programming Key

What do I do if I don't have a CPU Programming Key? Temporarily short out the program key pins on the CPU with a 47K-ohm resistor.

CPU-2000: No LEDs on New Install

On a new install, there are no LEDs lit on any module, and the piezo constantly sounds. What is wrong? Check the top Row Ribbon Cable (P/N 71087) for proper connection—the connector with none of the gray ribbon wires "notched/cutout" is the end that should go into the CPU-2000.

Sensiscan 2000: Problems When Disabling a Zone

I have disabled a Sensiscan 2000 zone and the Disable LED is on, but no LED on any zone cards.

Disabling a circuit will cause the Trouble LED for that circuit and the Disabled Circuits LED to turn on. If an IZ-4F module is installed it is possible that one of the "phantom" zones has been disabled. The phantom zones are the 4 unused circuits on the right hand side of the IZ-4F. Even though they are unused, the CPU still see's those circuits when stepping through Disabling/Enabling Circuits. So a phantom zone could be disabled, but since there is no Trouble LED for that circuit, only the Disabled Circuits LED is lit.

To correct this condition:

• If you have an IZ-8F installed in the system, power down the system completely and swap the IZ-4F and IZ-8F positions, upon power up it should show which phantom zone had been disabled. Enable the zone, power down, swap the modules back, and then power up.
  

OR:

• Perform a Clear Program. NOTE: The panel will have to be reconfigured, and then re-program after the Clear Program.

Silence Switch Won't Silence

On a new installation, the panel is in trouble and I don't have the ability to silence the system. Why doesn't the silence button work?

The first thing that needs to be done after the initial installation of a Sensiscan 2000's components is to perform a RECONFIGURE on the CPU-2000. This identifies the components attached to the CPU. The reconfigure can be performed by installing your programming key and the pressing 123-1231 <ENTER>. You MUST then press the #3 button to store the configuration before removing your programming key.

After a RECONFIGURE, correctly installed modules will act as follows:

• IZ-8F all red and yellow LEDs will light.
• IZ-4F all red and yellow LEDs will light.
• IC-4F/ICE-4F four green LEDs on left—all eight if the expander is installed—will light.
• CR-4F/CRE-4F four yellow LEDs on the right—all eight if the expander is installed will light.
• TC-2F/TC-4F all eight green LEDs will light.

UDACT-F

Phone Troubles (Note: applies to MS-5012, 5024, 5024UD 5210UD.)

PH_1 Primary Number Communication Fault

PH_2 Secondary Number Communication Fault

no_1 Primary Phone Line Fault

no_2 Secondary Phone Line Fault

A "PH 1" trouble is a failure of the primary telephone number and the "PH 2" trouble is a failure of the secondary telephone number to communicate with the Central Station. A "NO" trouble indicates that the phone line voltage has fallen below 4 volts for at least 2 minutes. The primary telephone line is represented by "1" and the secondary phone line is represented by "2".

See Also: UDACT-F Instruction Manual

Cannot Connect to the Central Station

Try changing the dialing type to rotary. The phone line may be a rotary dial line only. Also, switching to rotary slows the dialing rate which may help if the phone system is slow.

See Also: UDACT-F Instruction Manual

MS-5/10

The MS-5/10UD disconnects my premise phones on incoming phone calls.

The most common cause of this is improperly wired phone jacks. Verify that the service is coming IN on pins 4 & 5 (TIP and RING) and OUT on pins 1 & 8. If this is correct try reversing the TIP and RING (pins 4 & 5, of the RJ-31X block), it has been found that incorrect polarity is the cause for this issue.

Tech Tip:

It has been determined that polarity is a key factor in the MS-5/10 phone disconnects. Verify the correct wiring of the RJ-31X block, confirm that the service is coming IN on pins 4 & 5 (TIP and RING) and OUT on pins 1 & 8. If this is correct try reversing the TIP and RING (pins 4 & 5), this has been found to be very successful in resolving this issue.