Functions
6-1637SJ62 Manual
C53000-G1140-C121-1
Please note, the overload protection does not have a pickup comparable to the other
protective functions. The general relay pickup time is first started with the trip signal,
and an abnormal occurrence is opened. The dropout of the thermal image of the over-
load protection ends the fault message and, thereby, the running time from general re-
lay pickup to general device dropout.
6.18.2 Tripping Logic of the Entire Device
6.18.2.1 Description
General Trip The tripping signals for all protective functions are connected by “OR” and generate a
message indicating that the device has initiated a trip signal.
This message can be configured to an LED or binary output, just as the individual trip-
ping messages can.
Terminating the
Tripping Signal
• All trip signals from a protection function hold the 5HOD\75,3 function, and
start the minimum trip signal duration timer (set at address 7PLQ75,3&0',
see Figure 6-69). This trip signal duration timer ensures the trip signal is transmitted
to the circuit breaker for a sufficient amount of time, even if the function which is-
sued the trip signal drops out quickly. The trip signal is only terminated after all pro-
tection functions drop out AND the minimum trip signal duration expires.
• A further condition for terminating the trip signal is the opening of the circuit breaker.
This is monitored, using the status feedback indications from the circuit breaker and
current flow monitoring.
• Finally, it is possible to latch the trip signal until it is manually reset (lockout func-
tion). The reset takes place either by pressing the LED reset key or by activating an
appropriately masked binary input. A precondition, of course, is that the circuit
breaker trip coil – as usual – remains energized at the circuit breaker as long as the
trip signal is present, and that the trip coil current is interrupted by the auxiliary con-
tacts of the circuit breaker.
Figure 6-69 Terminating the Trip Signal
T
70LQ75,3&0'
S
R
Q
&
From
Trip
52 Open
S
R
Q
Lockout–Function
(Output Relay Stored)
Lockout Reset
(Using LED–Reset)
Relay TRIP
F# 0511
Protective
Functions
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