Sentry Model HM-535 Power Supply
Installation and Service Manual
430-535 0104 © 2004 Heritage MedCall, Inc.
9
on two data lines. The Sentry model HM-588 terminal board provides a simple and
clean method for making the wiring connections between a power supply, 2 data lines,
and the apartment panels. Seldom are data lines connected to the 51 panels maximum.
Therefore the power supply is rarely connected to it's 104 panel limit.
Sentry Devices Maximum current requirements:
HM-520 Sentry Plus Panel
0.085 Amps
85mA
HM-523 Intercom Panel
0.063 Amps
63mA
HM-524, 527, 528 Host Panel
0.045 Amps
45mA
HM-541 Remote Call Station
0.015 Amps
15mA
HM-544 Remote Assurance Panel
0.022 Amps
22mA
HM-545 Latching Call Station
0.030 Amps
30mA
HM-547 Pendant Receiver (standby)
0.010 Amps
10mA
Pendant Receiver (activated)
0.035 Amps
35mA
HM-560 Smoke Detector (standby)
0.010 Amps
10mA
Smoke Detector (activated)
0.020 Amps
20mA
HM-681 Dome Light
0.300 Amps
300mA
HM-685 Strobe Light
0.050 Amps
50mA
HM-694 Security Keypad (standby)
0.035 Amps
35mA
Security Keypad (speaker siren)
0.800 Amps
800mA
When calculating the power supply load, the devices that turn on temporarily or during
call acknowledge are not figured into the total current. Generally models HM-523, HM-
541, HM-544, HM-545, HM-681, HM-685 and the siren mode of the HM-694 security
keypad are not included in current calculations.
Total the current of all the devices in each apartment. Divide the 12 Amps of the power
supply rating by the total apartment current. This will give the maximum number of
apartments that can be powered by one supply.
7.0
WIRING LAYOUT
An important consideration is how the building will be wired between the power supply
and apartments. For simplicity of wiring and servicing, always attempt to group all the
apartments in one hallway, on a floor, or in a wing, so they are powered by the same
power supply. When following the wiring design recommendations, all the apartments
on one side of each hallway should be wired together, and each side then connected to
the terminal block. As apartments get wired into groups, the groups are totalled to
determine the current load to the power supply. This number is always rounded down to
the lesser number so that the power supply is seldom connected to a full load.
Note that usually adding another power supply to a system is simpler and more cost
effective than installing a complex wiring scheme that would break up obvious
apartment groups.
