Sentry Model HM-535 Power Supply
Installation and Service Manual
430-535 0104 © 2004 Heritage MedCall, Inc.
8
5.0
SPECIFICATIONS
LINE VOLTAGE
110 to 128 Volts, 60 Hz
AC LINE CURRENT
3.0 Amps Max.
OUTPUT VOLTAGE
12.8V to 15.5V DC
LINE REGULATION
2% Output, 102 to 125V Input
LOAD REGULATION
2% Output, No Load to 12 Amps
OUTPUT CURRENT
12 Amps Max.
CURRENT LIMIT
Factory Set at 12.5 Amps
BATTERY
Sealed Gel type
12 Volt, 15 Ah
BATTERY FUSE
12 Amp, Type 3AG
OPERATING 50 C (122 F) max. ambient
TEMPERATURE
DATA
Standard Sentry protocol,
COMMUNICATION
1200 baud, RS 485.
Permanently set to address 63
6.0
POWER SUPPLY LOAD ESTIMATES
The HM-535 Power Supply has a rated output of 12 Amps. This output limits the
amount of devices that can be powered by a single power supply. All installations have
a host panel in each apartment and most include a smoke detector, and remote call
switches. Many installations use other Sentry devices as options, such as dome lights,
intercoms, and security. A table in the section below shows the current draw of each
device. Use this table to calculate the total current draw per apartment, then determine
how hallways or wings will be wired to figure the current draw to the apartment groups.
Knowing the total current in a typical apartment will also determine the maximum
number of apartments that can be powered by a single HM-535 Power supply.
EXAMPLE:
The typical apartment with one host panel and one smoke detector:
Sentry recommends to always figure current with smoke detectors in the alarm state,
70mA. With the host panel at 45mA and the smoke detector at 70mA the apartment
total is 115mA. The 12 amp rating of the 535 power supply is divided by the .115A
(115mA) to show a total of 104 apartments with this configuration can be powered from
one power supply.
As a basic guide for estimating typical installations, Sentry usually uses '100 apartments
maximum' to approximate power supply requirements. Always calculate currents before
providing a final design and consider all possible optional devices. The '100 apartment'
number estimate also relates well with the data line capacity which is limited to 51
apartments maximum each. Usually one power supply is used to power all apartments
