Publicité
Les langues disponibles
Les langues disponibles
Operating instructions
MOC3ZA
Notes
Note
8014608/1DS0/2022-02-16
Subject to change without notice
Product description
3.6
Operation with DC motors
It is possible to use the Standstill Monitor MOC3ZA for the detection of the standstill of DC
motors if the motors generate a remanence voltage as they coast down.
➢ For this purpose connect the measurement input terminals as for a single-phase AC
motor.
As the remanence voltage on DC motors is always a DC voltage, during operation and
on coasting down the MOC3ZA signals a constant offset or wire break error on the ERR
LED and on the semiconductor output ERR.
None of the other functions are impaired.
➢ If the storage of errors is deactivated by fitting a jumper to the terminals S2/X1, the
MOC3ZA can detect the safe motor standstill (see section 8.3.5 "Error storage and
deletion" on page 69).
3.7
Operation with electronic motor controllers
It is possible to use the Standstill Monitor MOC3ZA for the detection of the standstill of
motors with electronic motor controllers (e.g. frequency converters, brake modules), if the
latter do not supply any output voltage in case of motor standstill (i.e. in the case of
frequency inverters there must not be, e.g., any position control and in the case of brake
modules the brake voltage must be switched off).
If the frequency inverter supplies a DC offset or if there is braking with a DC voltage, then
during this time an offset or wire break error will be signaled on the ERR LED and on the
semiconductor output ERR.
This error can be reset automatically by briefly switching off the supply voltage or by fitting
a jumper between the terminals S2/X1.
In the case of operation with frequency converters, it may be necessary to use screened
measurement connection cable to the motor; the screen must be connected to the motor.
© SICK AG • Industrial Safety Systems • Germany • All rights reserved
en
Chapter 3
55
Publicité
Chapitres
