PSWZ X1P
Operating Manual PSWZ X1P
21005-EN-11
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Block diagram/terminal configuration
**Insulation against the non-marked area and between the relay contacts: Basic insulation
(overvoltage category III), protective separation (overvoltage category II); at 250 V, 4 kV
***Insulation against the non-marked area and between the measurement connections: Ba-
sic insulation (overvoltage category III), protective separation (overvoltage category II); at
690 V, 6 kV
}
Channel 1: L1-L3
}
Channel 2: L2-L3
Function description
The device uses two separate measuring channels to measure the regenerated voltage, in-
duced from the motor during the rundown period. If the voltage falls below the set response
value (standstill threshold), the PSWZ X1P enables the monitored plant.
When used with frequency converters, the PSWZ X1P cannot detect standstill until the con-
troller inhibit has been switched off.
After the supply voltage U
B
is switched on, the unit performs a self test. The unit simulates a
situation in which the release value is exceeded and the measuring circuit has an open cir-
cuit. The correct function of the output relay and feedback loop is also tested. The test
takes approx. 1.5 s.
The unit is ready for operation when the feedback loop is closed and the measuring circuits
are not interrupted.
}
Procedure when the measuring voltage falls below the response value U
on
on both chan-
nels L1-L3 and L2-L3:
– LEDs "POWER", "CH.1 IN", "CH.2 IN" and "OUTPUT" are lit.
– Safety contacts 13-14 and 23-24 are closed, auxiliary contact 41-42 is open.
– A high signal is present at semiconductor output Y32.
}
Procedure when after the motor has started, the voltage in one of the two measuring cir-
cuits exceeds the release value U
off
:
– Safety contacts 13-14 and 23-24 are opened redundantly, auxiliary contact 41-42 is
closed.
