Sel 411L - Page 792

P.12.32
SEL-411L Relay Protection Manual Date Code 20151029
Bay Control
ACSELERATOR QuickSet SEL-5030 Software Bay Control Screens
Disconnect Switch Status. Wire the normally open and normally closed
auxiliary contacts from each disconnect switch to relay inputs, and program
the relay inputs into 89AM01 and 89BM01 SEL
OGIC control equations. The
89AM01 and 89BM01 SEL
OGIC control equations report the state of the
disconnect switch auxiliary contacts. Both equations must be programmed for
the disconnect switch status and alarm logic to function correctly.
89AM01 := IN203
89BM01 := IN204
Disconnect Alarm Pickup Delay. This setting monitors the open/close
operations (the undetermined time) of the disconnect switch. When the
disconnect alarm timer expires, an alarm condition exists and the 89AL1
Relay Word bit asserts. Set the 89ALPm timer longer than the expected
operation (undetermined state) time, and also slightly longer than the 89CSTm
or 89OSTm seal-in timers in the case when the relay provides the seal-in
circuit. This provides the disconnect switch more time to complete the close or
open operation in the case that the inertia on the motor rotor keeps the
disconnect motor moving. Setting 89ALPm timer longer than the 89CSTm
seal-in timer also guarantees that the close signal will not be removed before
the disconnect switch is completely closed. The expected disconnect operation
time in this example is 300 cycles. 89ALPm is entered in cycles and has a
range of 1–99999.
89ALP01 :=300
For this example, assign the expected operation time to every one of the three
disconnect switches.
Disconnect Close/Open Control. Program SELOGIC control equations
89CCNm and 89OCNm to close or open disconnect switch m, respectively.
Take care when programming these equations because there is no breaker
jumper supervision or access level safeguards in place for this disconnect
operate method.
The default settings close the disconnect switch when 89CCm is asserted and
LOCAL Relay Word bit is deasserted. Similarly, the default settings open the
disconnect switch when 89OCm is asserted and LOCAL Relay Word bit is
deasserted.
89CCN01 := 89C01
89OCN01 := 89O01
Disconnect Close/Open Seal-in Timers. The seal-in timers assert the
close or open signal long enough to allow the disconnect operation to
complete. Set the seal-in timer 10 to 15 percent longer than the expected
disconnect operate time to give the disconnect switch time to complete the
operation. 89CSTm and 89OSTm are entered in cycles and have a range of
1–99999. The example shown anticipates a disconnect switch operate time of
approximately 300 cycles.
Cold weather and low battery voltages can impact disconnect switch operation
times. Be sure to consider these conditions when setting the seal-in timers.
The relay contacts must not be used to break the motor coil current. An
auxiliary contact with adequate current interrupting capacity must first
interrupt current supply to the motor before the relay contact opens. Include
the auxiliary contact clearing time when setting the disconnect seal-in timer.
89CST01 := 280
89OST01 := 280