NOTIFIER AVPS-24 Power Supply Instructions
- June 9, 2024
- NOTIFIER
Table of Contents
NOTIFIER AVPS-24 Power Supply Instructions
Use the following instructions for repair of MPS-24 or AVPS-24 power supplies that may have a defective PTC component.
- Verify the fire alarm system has the defective component. Systems which may exhibit this problem include AM-2020, AFP1010, XP, System 5000, System 2500, Sen siskin 2000, or System 500 models which were shipped from Notifier/Fire· Lite between May, 1991 and January 15, 1992. Only those systems which use the MPS-24, MPS-24E, MPS-24F, AVPS-24, AVPS24E or AVPS-24F modules may have the problem. MPS-24A or MPS-24B series power supplies are not affected.
The defective part is a particular PTC (Positive Temperature Coefficient) resistor which is used for power limiting, and acts as a self-restoring fuse. It limits the power for unregulated DC indicating appliances. Although rated for 3.75 amperes, the component may activate after 2 to 10 minutes if the load current exceeds 2.0 amperes, causing a shutdown of any indicating appliances or other output devices connected to the system. This component is a yellow disk, marked “E7500 3.75A”, located on the power supplies as shown below. On the enclosed replacement board, the non-defective part is marked with the same number, but is noticeably thicker.
- Notify the local fire department, building owner, and other local authorities of the plan to temporarily disconnect the fire alarm system for service.
- Shut off main AC power to the system.
- Disconnect all batteries connected the MPS-24 or AVPS-24 power supplies.
- Remove all wires and cables connected to the PC board on the MPS-24 or AVPS-24 power supplies. If necessary, mark the wires to aid re-installation.
- Remove 7 screws from the MPS-24 or 4 screws from the AVPS-24 as shown above. Set the screws aside for later reinstallation.
- Remove the PC board and replace with the board supplied by this kit. Install the screws.
- Connect all wires and cables in their original position on the PC board. Do not yet connect the batteries.
- Apply AC power to the system.
- Connect the batteries.
- Test the system, especially the power supply outputs.
- Notify all authorities that the fire alarm system is again operational.
- Package the board with the defective PTC in the carton used with this kit.
Return to: Notifier/Fire· Lite Alarms Repair Department 12 Clintonville Rd. North ford, CT 06472
References
Read User Manual Online (PDF format)
Read User Manual Online (PDF format) >>