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Settings
The setting elements necessary for the cold load protection and their setting ranges are as follows:
Element
ICLDO
TCLE
TCLR
TCLDO
[CLSG]
[CLDOEN]
These settings are required for all setting groups and the same settings must be entered for the setting
elements above.
2.10 Trip Signal Output
As shown in Figure 2.10.1, all the trip signals are introduced into one of the seven user configurable
binary output circuits. One tripping output relay with a pair of normally open and closed contacts
is provided to trip the local circuit breaker. If the breaker failure protection is applied, the back-trip
signal CBF TRIP is introduced into another binary output circuit to trip adjacent circuit breakers,
as shown in Figure 2.10.2.
After the trip signal disappears by clearing the fault, the reset time of the tripping output relay can
be set with the scheme switch [Reset] to "instantaneous(Ins)", "delayed(Dl)", "dwell(Dw)" or
"latched(Lat)". The time of the delayed drop-off "Dl" or dwell operation "Dw" can be set by TBO.
The setting is respective for each output relay.
When the relay is latched, it is reset with the RESET key on the relay front panel or a binary input
signal REMOTE RESET. This resetting resets all the output relays collectively.
When instantaneous reset of the tripping output relay is selected, it must be checked that the
tripping circuit is opened with a circuit breaker auxiliary contact prior to the tripping output relay
resetting, in order to prevent the tripping output relay from directly interrupting the circuit breaker
tripping coil current.
Settings
The setting elements necessary for the trip signal output and their setting ranges are as follows:
Element
Range
[RESET]
Ins / Dl / Dw / Lat
TBO
0.00 – 10.00s
Range
Step
0.10 – 10.0 A
0.01 A
0-10000 s
1 s
0-10000 s
1 s
0.00-100.00 s
0.01 s
Off / 1 / 2
Off / On
Step
Default
Ins
0.01s
0.20s
49
Default
Remarks
0.50 A
Cold load drop-off threshold setting
100 s
Cold load enable timer
100 s
Cold load reset timer
0.00 s
Cold load drop-off timer
Off
Cold load setting group
Off
Cold load drop-off enable
Remarks
Output relay reset time. Instantaneous,
dwell, delayed or latched.
6 F 2 T 0 1 7 2
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