Datasheet

Relays for functional safety
Safety relays PNOZ X
PSWZ X1P
Pilz GmbH & Co. KG, Felix-Wankel-Straße 2, 73760 Ostfildern, Germany
Telephone: [phone], Telefax: [phone], E-Mail: [e-mail]
2016-09
521
} Procedure when after the motor has started, the voltage in one of the two measuring
circuits exceeds the release value U
off
:
– Safety contacts 13-14 and 23-24 are opened redundantly, auxiliary contact 41-42 is
closed.
– A low signal is present at semiconductor output Y32.
– LEDs "CH.1 IN", "CH.2 IN" and "OUTPUT" go out.
To reactivate, the voltage at both channels L1-L3 and L2-L3 must fall below the response
value U
on
within the time t
g
(simultaneity monitoring) and the feedback loop must be closed.
The response value U
on
can be set jointly for both channels in order to suit the motor that is
to be monitored. The release value U
off
(hysteresis) corresponds to twice the response
value.
If the simultaneity requirement is exceeded, the "FAULT" LED is lit and on the semicon-
ductor output Y35 there is a High signal. The PSWZ X1P does not enable the monitored
plant. The fault is reset by applying a High signal and then a Low signal at the reset input.
Self test
An internal self test is carried out during initial commissioning and each time the supply
voltage is switched off and on. The process simulates switching all measuring voltages on
and then off again. Provided no error occurs during the self test, the unit will then be ready
for operation.
Operating modes
} Single-phase operation:
– One measuring circuit (calculated at two different measuring points) affects both
channels
} Three-phase operation:
– Two redundant (identical) measuring circuits affect channel 1 and 2
– Voltages in the measuring circuit are monitored (failsafe in the event of a short cir-
cuit)