Date Code 20011009
SEL-701-1 Monitor
Settings Calculation
Output Configuration
3.47
Output Contact Fail-Safe, Trip Duration, & Starting Lockout Settings
The SEL-701-1 Monitor allows you to enable fail-safe output contact operation
for monitor contacts on an individual basis. When contact fail-safe is enabled, the
monitor output contact is held in its energized position when monitor control power is
applied and falls to its deenergized position when control power is removed. Output
contact deenergized positions are indicated on the monitor chassis and in
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 monitor 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 monitor 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
monitor 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.
Table 3.37
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
Содержание SEL-701-1
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