Schweitzer Engineering Laboratories SEL-701 - Table 4.36 Output Contact Fail-Safe Trip Duration, and Starting Lockout Settings

Date Code 20010719 701 Motor Protection Relay
Settings Calculation
Output Configuration
4.45
Output Contact Fail-Safe, Trip Duration, & Starting Lockout Settings
Table 4.36 Ou tp ut Contact Fail-Sa fe, Trip Durati on, and Starting Lockout Setting s
The SEL-701 Relay allows you to enable fail-safe output contact operation for
relay contacts on an individual basis. When contact fail-safe is enabled, the relay
output contact is held in its energized position when relay control power is applied and
falls to its deenergized position when control power is removed. Output contact
deenergized positions are indicated on the relay chassis and in Figure 2.11 on
page 2.14 in Section 2: Installation.
When TRIP Contact Failsafe is enabled and the TRIP output contact is
appropriately connected to the motor breaker or contactor, the motor is automatically
tripped when relay control power fails. This setting/connection philosophy is
appropriate if the protected motor is more valuable than the process that the motor
supports. In critical applications where the protected motor is not more valuable than
the process, you may want the motor to run even if the relay is out of service. In this
case, disable TRIP Contact Failsafe by selecting N.
The Minimum Trip Duration Time is the minimum amount of time that the relay
trip signal will last in the event of a fault. Set this time at least as long as your motor
breaker operate time or your motor contactor dropout time. In the event of a thermal
element trip or a trip caused by the starts per hour limit or minimum time between
starts function, the trip signal will remain until the motor thermal estimate has cooled
or time has passed to permit another start.
Antibackspin Setting
Table 4.37 An tiba ckspin Setting
In certain pump applications, fluid flowing backward through the pump may spin
the pump motor for a short time after the motor is stopped. It is dangerous to attempt to
Table 4.36 Output Contact Fail-Safe and Trip Duration Settings
Setting Prompt Setting Range
Setting Name =
Factory Default
Enable TRIP Contact Failsafe Y, N TRFS = Y
Enable OUT1 Contact Failsafe Y, N OUT1FS = N
Enable OUT2 Contact Failsafe Y, N OUT2FS = N
Enable OUT3 Contact Failsafe Y, N OUT3FS = N
Minimum Trip Duration Time 0.00–400.00 s TDURD = 0.50
Table 4.37 Antibackspin Setting
Setting Prompt Setting Range Setting Name = Factory Default
Antibackspin Starting Delay 0–60 min ABSDLY = 0