GE Industrial Solutions EntelliGuard TU Trip Units - Manual (Page 55)

DEH-4567B EntelliGuard TU Trip Units: UL/ANSI Models
Trip Unit Integration
©2012 General Electric All Rights Reserved 45
SECTION 7. TRIP UNIT INTEGRATION
REDUCED ENERGY LET-THROUGH (RELT) SWITCH WIRING
The RELT switch may be connected to a manually operated
two-position switch, a remote sensor, or both
simultaneously. The EntelliGuard TU trip unit provides a
feedback capability directly from the trip so you know the
signal got to the trip unit and the settings have changed.
Optionally, an indicating light may also be connected to the
source of control power so the user knows if control power
is available to change the setting. The trip unit does not
require its own control power to accept a RELT input and
change the Instantaneous trip pick according to the user
settings. However, if control power is available to the trip
unit, the feedback signal will function immediately, rather
than when the trip unit becomes self-powered through its
load current.
Figure 7-1: RELT Connection when Using Positive
Feedback from EntelliGuard TU Trip Unit
Figure 7-2: RELT Connection Without Positive Feedback
from EntelliGuard TU Trip Unit
TIM1 WIRING
Figure 7-3: TIM1 Wiring