1MDU07212-YN Rev. D Section 4
Protection and Control Function
REF601 / REJ601 / REM601 33
Application Manual
4.9.2.2 Inputs to Motor startup / Stalling protection
Table 19: Inputs to startup supervision/stalling protection I2t n<, 51LRS/14/48/66
Input signal for showing the motor is not
stalling (from speed switch)
Table 19: Inputs to startup supervision/stalling protection I2t n<, 51LRS/14/48/66, continue
Blocking of function via binary input
4.9.2.3 Outputs to Motor startup / Stalling protection
Table 20: Outputs from startup supervision/stalling protection I2t n<, 51LRS/14/48/66
Motor operate signal for stalling protection.
Motor operate signal for thermal stress.
Lockout condition for restart of motor
Measured motor latest startup time in sec
Measured motor latest current time in amp
Time left for restart when lockstart is enabled
in minutes
4.10 Phase reversal protection
4.10.1 Functionality
The phase reversal protection is used to detect the reversed connection of the
phases to a three-phase motor by monitoring the negative phase sequence current
(I2) of the motor. Function starts when the negative sequence current (I2) exceeds
the set value. The operate time characteristics is based on definite time (DT) i.e.
function operates after a predefined operate time.
4.10.2 Principle of operation
The measured negative sequence current is compared to the set I2R>. If the
measured value exceeds the set I2R>, the level detector activates the timer module.
On activation, timer activates the I2R> START output. The time characteristic is
according to Definite Time (DT). When the operation timer has reached the value
set by the tI2R>, the protection TRIP output is activated. If the fault disappears
before the module operates, the function resets immediately, and the protection
START output is deactivated.
The protection could be blocked by settings or via binary input of the relay.
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