MONITOR FUNCTIONS

SYSTEM POWER-UP INHIBIT

The System Monitor provides a Power-up Inhibit function. This function allows each monitor to

inhibit its alarms during power-up or whenever a system supply voltage falls below its operating

level. After power-up, the inhibit function remains active for approximately 2 seconds.

RACK INHIBIT

When activated by a external contact closure this function places all monitors in bypass, disables

all alarms, zero scales all outputs, and de-energizes the system OK relay. The connections for this

function are located on the power input module (PIM) at the rear of the rack.

SUPPLY VOLTAGES OK

Seven LEDs located behind the front panel of the System Monitor are ON to indicate the voltage

supplies are functioning. The voltage supplies are +VRH, +VRL, +7.5V, +5V, REF, -7.5V, and -VT.

There is a green LED (SUPPLIES OK) on the front panel of the System Monitor. When this LED is on

all of the voltage supplies are functional.

SYSTEM RESET

The System Monitor provides the ability to cause a System Reset. Closing external contacts

through terminals on the PIM or pressing the RESET switch on the front panel will cause a System

Reset.