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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.

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