PNOZ e1p
Operating Manual PNOZ e1p
21242-EN-13
| 9
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.
} Input circuit is closed (e.g. E-STOP pushbutton not operated):
– There are high signals at safety outputs 14 and 24 and auxiliary output Y32.
– The LEDs "CH.1" and "CH.2" are lit.
} Input circuit is opened (e.g. E-STOP pushbutton operated):
– There are low signals at safety outputs 14 and 24 and auxiliary output Y32.
– The LEDs "CH.1" and "CH.2" go out.
Feedback loop
Feedback loop is connected in series to the start circuit. Before a safety output is switched
on, a test is run to establish whether the contacts in the feedback loop are closed. If a con-
tact 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 func-
tion has been reset.
With automatic start, the feedback loop contacts are also checked when the signal at the
output changes from high to low. After this signal change, the feedback loop contacts 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 [ 16]). It will not be
possible to switch the unit back on until the error has been rectified and the supply voltage
has been switched off and then on again.
Operating modes
} Single-channel operation: Input wiring in accordance with EN 60204, no redundancy in
the input circuit; earth faults in the input circuit and start circuit are detected.
} Dual-channel operation: Redundant input circuit; earth faults in the input circuit and start
circuit are detected, with or without detection of shorts between the pushbutton contacts.
} Automatic start: Unit is active once the input circuit has been closed.
} 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 the input circuit is opened and then closed when
supply voltage is applied.
} Increase in the number of available contacts by connecting contact expandsion modules
or external contactors/relays.
To Next Page
Loading...
Need help?
General
