Specifications

4 MONITOR ISM™/AFx™ IP Connectivity Guide
22-9058 v2.1
1.3 Power
Considerations
AC power to the Control unit is 16VAC,
using a 37-40 VA Transformer.
Exception:
European cabinets may include a 230V to 16V toroidal
transformer.
Each main panel can provide up to 750 mA
for all loads (modules/SNAPP bus, plus
auxiliary power connections).
Expansion modules typically draw 150 mA
(excluding door and elevator controllers--which
normally include a dedicated power supply)
. The
host IP interface board draws 250 mA, and
slave boards draw 75 mA. Adding power
supplies for the IP boards is
recommended.
Devices should be clustered together, and
situated close to the power supply. Otherwise
additional power supplies should be added. (Use
a multi-meter to ensure adequate voltage is
available at each device (at least 12.5 volts to
allow for reasonable battery backup operation
during a power failure). Current loss due to cable
length/overloading can also cause failures.
Exception: Elevator controller and Multi-Tenant
Apartment Security System keypad installations
include unique power and cabling aspects.
Always refer to the installation instructions
provided with each device.
Note: For multi-door controller cabinets and
other heavy-load cabinets that include their own
power supplies, the Module Bus (+12) line should
be treated as a 'pass-through' type of connection
only, with only the Module Bus A, B, and ( − )
lines connecting to the devices inside the
cabinet.
Peripheral devices that draw current, such as
smoke detectors and motion detectors should be
powered from the module they are connected to
– rather than from the control panel auxiliary
power terminals.
1.4 Grounding
System cabinets must each be connected
to a locally approved earth ground using 18
AWG (or heavier) stranded wire.
The cable shield for any RS-485 links must
be earth grounded at the main panel, and
spliced together at all junction points (to
distribute the shield ground to all sections of
the cable). It must not be terminated
anywhere else.