Simultaneity Of The Measured Signals; Error Storage And Deletion; Error Rectification; Tab. 5: Error Rectification - SICK MOC3ZA Notice D'instructions

Operating instructions
MOC3ZA
Note

WARNING
Note

Tab. 5: Error rectification

8014608/1DS0/2022-02-16
Subject to change without notice
Fault diagnosis
8.3.4

Simultaneity of the measured signals

As a further safety function the signals on both measurement channels are continuously
compared (L2 against L1 and L3 against L1). In this way the internal failure of a
measurement channel can be detected at an early stage.
If the signals on the measurement channels differ in relation to the voltage threshold set
for longer than 2.5 s (one measurement channel > U
simultaneity error is signaled: The semiconductor output ERR switched on and the ERR
LED flashes  Red with the error code 5.
If then also the measurement channel that had supplied signals > U
any further signals (measurement input voltage drops to < U
remains nevertheless saved, i.e. the output relays are switched off.
A simultaneity error is only reset once simultaneous signals > U
both measurement channels. If then the signals on both measurement channels again
(simultaneously) drop to < U
If the simultaneity error occurs frequently on the motor coasting down, e.g. with slow
coasting down, then you can solve this problem with the following measures:
➢ Set the voltage threshold U
➢ Connect the measurement circuit to the motor using a single-phase configuration
instead of a three-phase configuration.
➢ If necessary undertake a new safety assessment.
8.3.5

Error storage and deletion

In the case of errors caused externally, "wire break/offset" and "EDM", the user can
choose whether the error messages remain saved after the rectification of the error or are
automatically deleted:
 S2/X1 open: Errors remain saved
 S2/X1 jumpered: Errors deleted
Do not use the storage of external errors for safety purposes!
The storage of the external errors "wire break/offset" and "external device monitoring" is
not designed for safety-related purposes. During the safety assessment you must
therefore assume the automatic deletion of these error messages after the rectification of
the related error.
The infrequently occurring internal device errors (e.g. due to temporary faults) can be
deleted by switching off and on again the supply voltage. If it is not possible to delete this
type of internal error despite re-applying the supply voltage with the correct magnitude,
there may be a fault in the device. In this case return the device for checking and repair.
8.4

Error rectification

This section addresses possible errors and how you can react to them. You will find a
description of the LEDs in chapter 3.2 "Controls and status indicators" on page 51.
© SICK AG • Industrial Safety Systems • Germany • All rights reserved
an
, the output relays are energized again.
an
higher.
an
and the other < U ), then a
an
, has not provided
an
), the simultaneity error
an
are detected again on
an
en
Chapter 8
69