14
Instruction Leaflet
I. L. 29-886B
Effective August 2011
Instructions for Digitrip RMS 610 Trip Unit
eaton corporation
www.eaton.com
1.4 Power / Relay Module
The Power / Relay Module (PRM) (see Figure 10) is separate from
the RMS Digitrip 610 Trip Unit itself, and is
not required
for the Trip
Unit to perform its
protection functions
. The Power / Relay Module
performs two functions . First, it uses available external control
power (120 V 50/60 Hz ac, 6 VA) to operate the display window and
reason for trip LED indicators . Second, it provides relay contacts for
use by other devices remote from the circuit breaker .
Figure 10. Power / Relay Module.
The relays operate when the Trip Unit detects the following condi-
tions, as shown in Figure 2:
•
Short-Circuit Trip Alarm
•
High Load Alarm
•
Long Delay Trip Alarm
•
Ground fault Trip Alarm (types LIG, LSG, LSIG) or Neutral Over-
Current Alarm (types LI, LS LSI) as shown in Figure 2 .
Each relay contact is rated for 120 V, 50/60 Hz AC, 1 .0 Ampere .
The High Load Alarm contact operates after the load current has
exceeded 85% of the long delay current setting,
I
r
for 40 seconds .
The 40-second delay allows the system to "ride through" momentary
high load conditions and avoid nuisance alarms .
The Long Delay Trip Alarm contact operates after the breaker TRIPS
due to over-load conditions which exceeded the Long Delay Trip set-
tings .
For Type LSG, LIG, and LSIG Trip Units, the Ground Fault Trip Alarm
contact operates after the breaker TRIPS due to conditions which
exceed the Ground Fault protection settings . For Type LS, LI, and
LSI Trip Units, the Neutral Current Alarm contact operates when the
neutral current exceeds the Long Delay Current protection setting,
I
r
.
The Short-Circuit Trip Alarm contact operates after the breaker TRIPS
due to an INSTantaneous trip, Short-Delay Trip, DISCriminator trip, a
Fixed Instantaneous OverRIDe trip, or a Rating PLUG trip as appli-
cable .
Even without available external control power, once the load cur-
rent through the circuit breaker exceeds approximately 20% (40%
if single phase) of the frame / current sensor rating, the green LED
will flash "On and Off" once each second, to indicate the Trip Unit
is energized and operating properly, and all protection functions are
functioning . However, the display window will remain dark .
otee:
N
If 120 Vac control power is lost to the Power / Relay Module, the
LOCKOUT after trip will reset and the breaker can be closed again . However
the cause of trip bit will remain set in the Digitrip's non-volatile memory and a
cause of trip message will reappear when control power returns . A complete
clearing of cause of trip history may be accomplished by depressing the reset
push-button when the Digitrip unit is powered up (indicated by the Unit Status
flashing) .
1.5 Auxiliary Power Module
The Auxiliary Power Module or APM (Cat . No . PRTAAPM), illustrated
in Figure 11, is an encapsulated power supply that requires a 120 Vac
input at either 50 or 60 Hz . It provides an output of 32 Vdc (nominal
40 Vdc open circuit) which is used during testing of the Digitrip RMS
610 Trip Unit, whenever 120 Vac control power is not available to
the Power / Relay Module (see Section 1 .4) . When a drawout circuit
breaker is equipped with a Digitrip RMS 610 Trip Unit, it can be con-
veniently set and tested while the circuit breaker is either out of its
cell or in its cell in the "Test", "Disconnect", or "Withdrawn" positions
by using the Auxiliary Power Module .
The Auxiliary Power Module is equipped with a unique plug-in con-
nector suitable only for plugging in to the keyed receptacle in the
upper right corner of a Digitrip RMS Trip Unit as shown in Figure 1 .
This avoids the inadvertent use of an incorrect type power module .
The APM is suitable for use with older Digitrip RMS 500, 600, 700,
800, as well as newer RMS 510, 610, 810, and 910 Models .
Figure 11. Auxiliary Power Module.
Plug for 120Vac
Receptacle
Trip Unit Connector (Fits into Keyed
Cavity in Top Right Corner of Trip
Unit . See Figure 1)
