5
Instruction Leaflet
I. L. 29-889B
Effective June 2011
Instructions for Digitrip RMS 910 Trip Unit
eaton corporation
www.eaton.com
1.1.1 Operational Status and Protection TRIP Indicators
The "Green" Light Emitting Diode (LED) in the lower right corner of
the Trip Unit (Figure 1) "blinks" once each second to indicate the Trip
Unit is operating normally .
otee:
N
If the LED is steadily "GREEN", i .e . not blinking, the Trip Unit is not
ready . Check the 120 VAC control power to the Power / Relay Module, if the
LED is not blinking (see Section 1 .4 .) .
The LEDs, shown in Figures 1 and 3 thru 8 on the face of the Trip
Unit, light "RED" to indicate the reason for any automatic trip opera-
tion . As indicated in Figures 3 - 8, each LED is strategically located
in the related segment of the time-current curve depicted on the
face of the Trip Unit . The reason for trip is identified by the segment
of the time-current curve where the LED is lighted "RED", and is
also identified on the Display . Following an automatic protection trip
operation, the external control power to the Power / Relay Module
(see Section 1 .4) will maintain the LED "RED" and will continue to
send a
TRIP
signal to
LOCKOUT
the circuit breaker until the Trip
Unit is
RESET.
The Digitrip RMS 910 Trip Unit can be
RESET
in two
ways:
•
Either press and release the "
TRIP RESET
" button (See Figure 1
lower right corner just above the "
UNIT STATUS
" LED);
or
•
By the "Trip Reset" remote communications function (see Section
5 .9 .) .
Figure 1. Digitrip RMS 910 Trip Unit Type LSIG with Rating Plug.
Green LED's
Light to Identify
Which Value Is
Presently Being
Displayed in
Window
The Unit INCOM
Address
Catalog Number
LED's light "Red"
to indicate cause
of trip
Time-Current
Curve for Ground
Protection
SPB Rating Plug
View Settings in
Window
Adjust Protection Settings
for Desired Values with
Rotary Switches
Trip Unit Operation Status
"Blinking Green"=OK (See
Section 1 .1 .1)
R-Frame Rating Plug
Press and Release "Trip
Reset" Push Button to
Reset Trip Unit
Press and Release "Test"
Push Button to Initiate
Self-Test (See Section 4)
Press and release "STEP" Push button
to Display Value of Next Parameter in
Window
Press and release "PEAK RESET"
Push button to Reset Peak Demand
Reading to Zero
4-Character
Display Window
Keyed
Receptacle
for Auxiliary
Power Module
Connector (See
Section 1 .6)
Time-Current curve for
Phase Protection
DS Rating Plug
