Areva MiCOM P225, Technical Manual

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P225/EN FT/B11 User Guide
Page 44/52 MiCOM P225
4.11.12 The ABS sub-menu: Minimum time between a stop and a start
The ABS (anti-backspin) function imposed a waiting time between a stop and a re-start of
the motor. This waiting time makes it possible to stop rotating before the motor is re-started.
It is based on the use of an adjustable time delay: tABS.
This time-delay is initiated when a motor stop is detected. As long as this timer is running, an
ABS indication issued. This ABS indication disappears at the end of the tABS time-delay.
Current flowing into motor
Motor running
t
ABS
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ABS
4.11.13 VOLTAGE CHECK sub-menu: Validation of voltage presence before a start
This function makes it possible to check that the system voltage level is sufficient to allow a
satisfactory motor start sequence.
It is only valid when the relay "sees" the motor as stopped.
With the motor stopped, the P225 relay issues a "BUS VOLTAGE" indication if the measured
voltage (between phases A and C) is below a settable threshold, "V BUS".
The pick-up and drop-off of the "BUS VOLTAGE” indication are instantaneous.
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Internal
logic
informations
&
V
A-C
Motor
halted
V BUS<