2
ELECTRICAL CONNECTIONS
Remove all system power before installation,
first battery and then AC.
(To power up, first
connect the AC and then the battery.)
Primary Power
Primary power for the PSR-1 is provided by the
MPS-6 or MPS-12. Both of these mount in the
lower right-hand corner of the MXL enclosure.
Follow the instructions below for the appropriate
power supply.
MPS-6
—
Install the MPS-6 (See MPS-6 Instruc-
tions, P/N 315-090334). With the AC mains
disconnected, connect the MPS-6 power cable to
P12 of the PSR-1.
Be sure that the jumper
assembly is installed in P10 of the PSR-1. If
this jumper is not installed, the PSR-1 will
detect a permanent AC fail or indicate auxilia-
ry power voltage is low.
Change F2 to a 15A fuse, P/N 105-224090.
Change F3 to a 6A fuse, P/N 105-268095.
MPS-12
—
Install the MPS-12 (See MPS-12
Instructions, P/N 315-092030). Remove and
discard the jumper assembly installed in P10 of
the PSR-1. Disconnect the AC mains. Connect
the MPS-12 power cable to P10 of PSR-1.
Battery Calculations
Battery backup is a requirement for the MXL. To
determine the size battery you must use, follow
the procedures listed below. The MXL can
charge a battery of up to 55 amp hours. A bat-
tery size calculation form is provided on page 3.
1. Record all the modules required in the form
on the following page.
2. Calculate each row across and place the total
in the right column:
Total Standby 24 VDC
Module Current
3. Total the right-hand column and record it at
the bottom of the form opposite
Total
System Current.
4. For
NFPA 72 Local and 72 Proprietary
systems
multiply the total system current by
24 and record it at that
Total AH location.
or
For
NFPA 72 Municipal Tie and 72 Remote
Station systems
multiply the total system
current by 60 and record it at that
Total
AH
location.
or
For
FM Appoved Deluge/PreAction
systems
multiply the total system current by
90 and record it at that
Total AH location
.
5. Multiply the AH Total by 1.3 to obtain the final
battery amp hour capacity and record it
opposite
Battery Size.
Three battery models are UL listed for use with
the MXL:
BP-61—24V, 15 AH
BTX-1—a set of 12V, 31 AH
BTX-2—a set of 12V, 55 AH, 65 AH, or 75 AH*
* Although larger batteries may be used, as
noted, the 55 AH capacity must be used for
determining battery requirements.
Select the battery that meets or exceeds the final
calculated battery amp hour rating. Use an
external battery box with the BTX-2 model.
Do not connect the batteries at this time.
Power Supply Load Calculations
To ensure that the power supply is not over-
loaded, complete the worksheet on page 4.
1. Enter the quantity of each module in the
enclosure.
2. Caclulate both the 24V and 5V loads for each
row.
3. Total the Active 24V and Active 5V columns.
4. Ensure that both totals are within the power
supply output ratings in the table below.
POWER SUPPLY OUTPUT RATINGS
Module
Active 24 VDC
Module Current
Active 5 VDC
Module Current
PSR-1/MPS-6
6 amps
800 mA
PSR-1/MPS-12
12 amps
800 mA
