Cattron-Theimeg i-Key, Operation & Maintenance Manual

Page: 23 / 90


01/2001, CATTRON - THEIMEG
TM
Section 2, Page 3
Typical method of operation , continued.
Figure 2-2 below shows the Operate (OPR) relay and optional Reset (RST) relay wired to control a
mainline contactor. This configuration requires the operator to activate the reset function on the
controller after he/she has turned the unit on. Once reset, the ML contactor stays energized until OPR
de-energizes.
In addition to being energized by the presence of a signal from the controller, OPR is under supervision
of the Automatic Safety Override (ASO) circuit. The ASO circuit disables the OPR (shutting down the
controlled machinery) if a directional output relay is active when no corresponding command is being
received from the controller. In this event, no action is required by the operator to stop the equipment.
The ASO safety circuitry will stop motion automatically without any operator command when a
directional output relay fault is detected.
Figure 2-2. Operate (OPR) contactor and Reset Relay (RST) wiring
OPR
120V
RST
R
R
C
C
5.0A
5.0A
L1
ML
ML
ML
MANUAL
DISCONNECT
L2
L3
LL1
LL2
LL3
TO
MOTOR
RECEIVER/DECODER EXISTING CONTROLS