PNOZ e3.1p
Operating Manual PNOZ e3.1p
21240-EN-09
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Function description
When supply voltage is applied and the set operating mode is detected (initialisation
phase), the "POWER" LED is lit. The unit is ready for operation when the feedback loop is
closed.
} Input circuit: Contact at S12 closed and contact at S24 open (e.g. safety gate closed)
– There are high signals at safety outputs 14 and 24 and auxiliary output Y32.
– LEDs "CH.1" and "CH.2" are lit.
} Input circuit: Contact at S12 open and contact at S24 closed (e.g. safety gate open)
– There are low signals at safety outputs 14 and 24 and auxiliary output Y32.
– LEDs "CH.1" and "CH.2" go out.
Feedback loop
Before a safety output is switched on, a test is run to establish whether the contacts ahead
of feedback loop input Y6 are closed. If a contact is open, an error is detected and LEDs
CH.1 and CH.2 will flash alternately. It will not be possible to switch the unit back on until
the feedback loop is closed and the safety function has been reset.
The feedback loop contacts are also checked when the signal at the output changes from
high to low. After this signal change, the contacts at the feedback loop input must close
within 150 ms. If a contact is still open after 150 ms has elapsed, an error is detected and is
displayed as a flashing code (1,8) (see Faults – Interference [ 20]). It will not be pos-
sible to switch the unit back on until the error has been rectified and the supply voltage has
been switched off and then on again.
AND/OR connection
The PNOZ e3.1p has two logic inputs S35 (OR) and S36 (AND) for logic connections
between several units.
Operating modes
} Dual-channel operation: Earth faults in the input circuit and shorts between the input cir-
cuit contacts will be detected.
} Automatic start: Unit becomes active once the contact at S12 has been closed and the
contact at S24 has been opened in the input circuit.
} Monitored start: Unit is not active until the start button has been operated and then re-
leased.
} The start-up test prevents automatic restarting after a power failure and subsequent re-
turn of voltage. The unit checks whether safety gates that are closed have been opened
and then closed again when supply voltage is applied.
} Increase in the number of available contacts by connecting contact expandsion modules
or external contactors/relays.
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