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Installation Instructions
Model MPS-12
Power Supply Module
OPERATION
The Model MPS-12 from Siemens Industry, Inc. is a
high current power supply that provides the MXL
System with primary 24 VDC power. It is rated at
12 amps and is unfiltered and unregulated. The
MPS-12 supplies the MXL Control Panel or PSR1and its expansion modules with the power required for normal operation. The module incorporates a 5 amp resettable circuitbreaker on the
primary input, a 15 amp fuse on the 24V output, and
a built-in AC line filter for surge and noise suppression. The MPS-12 mounts in an MXL enclosure
backbox.
INSTALLATION
Always remove power before installation.
The installation kit for the MPS-12 includes the
following:
Four #10 nuts
Two #10 lockwashers
Two #10 flat washers
Two ¼" nuts
One 14 gauge green ground strap
2. Place the mounting bracket for the MPS-12 over the
two studs provided in the enclosure. (Refer to
Figure 1.)
3. Secure the MPS-12 to the enclosure by slipping the
flat washers, then the lockwashers, and finally the
nuts over the two studs. Tighten them securely.
4. Connect the AC mains to the MPS-12:
Terminal
Black (hot) 1
White (neutral) 2
Green (earth ground) 3
5. Install the 14 gauge green ground strap spade lug
side to Terminal 3 (green, earth ground) of the
MPS-12. Secure the ring lug side of the ground
strap to the nearest available stud in the enclosure.
The stud size may vary depending on the actual
system modules and enclosure used. Because the
stud may be either a #10 thread or ¼" thread, nuts
for both have been provided. The ground strap
provided is long enough for all applications and the
ring lug is good for both #10 and ¼" studs. If
possible, install the ring lug under one of the lockwashers and nuts which secure the MPS-12 itself.
The MPS-12 is designed to operate from a 120
VAC, 60 Hz power source. Use a separate or
dedicated circuitbreaker. Wire in accordance with
local codes and Article 760 of the NEC, NFPA 70,
latest edition.
Run the earth ground from a suitable source to the
MPS-12. Check local requirements. Conduit is not
an acceptable conductor.
1. Make sure that the dedicated circuitbreaker
for the MPS-12 is turned off at the mains.
Siemens Industry, Inc.
Building Technologies Division
Florham Park, NJ
P/N 315-092030-8
6. When used with a PSR-1:
Connect the 8-wire cable coming from the MPS-12
to the PSR-1 at P10.
When used with an MMB-2/-3 or SMB-2:
Connect the 8-wire cable coming from the MPS-12
to the MMB-2/-3 or SMB-2 at P14.
When used with an MMB-1 or SMB-1:
Connect the CIA-12 Cable Adapter, P/N 500-692825,
to the 8-wire cable coming from the MPS-12, and
then to the MMB-1 or SMB-1at P1.
Siemens Building Technologies, Ltd.
Fire Safety & Security Products
2 Kenview Boulevard
Brampton, Ontario
L6T 5E4 Canada
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Figure 1
MPS-12 in MXL Enclosure
POWER CABLE TO:
PSR-1, P10
MMB-1/SMB-1, P1
MMB-2/SMB-2, P14
MMB-3, P14
P/N 315-092030-8
Figure 2
Front of MPS-12
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