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Chapter 3
3
Product description
WARNING
WARNING
50
© SICK AG • Industrial Safety Systems • Germany • All rights reserved
Product description
This chapter provides information on the special features and properties of the Standstill
Monitor MOC3ZA. It describes the construction and the operating principle of the device.
➢ Please read this chapter before mounting, installing and commissioning the device.
Always take into consideration the safety of the entire system!
The MOC3ZA is suitable for the provision of safety-related functions as part of a system or
machine. Further devices and components are generally incorporated in such a system. It
is the responsibility of the manufacturer of the system to ensure the overall safety-related
function of the system by means of the correct selection, mounting, wiring, adjustment and
operation of the components.
3.1
General description
The Standstill Monitor MOC3ZA permits the sensor-less monitoring of electric motors for
safe standstill. It detects the standstill of three-phase motors, single-phase motors and DC
motors that generate a voltage due to their remanence as they coast down. By adjusting
the voltage threshold for the standstill detection (U
between the voltage dropping below the voltage threshold and switching on the safety-
related output relay) the function can be adapted to a large number of different motors
and applications.
Properties
safe standstill monitoring of three-phase and single-phase AC motors
safe standstill monitoring of DC motors
suitable for use with frequency inverters
no external sensors necessary
direction of rotation-independent standstill detection
wire break detection in the measurement circuit
adjustable voltage threshold for standstill detection
adjustable standstill time
LED indicators for motor standstill, wire break and supply voltage
3 enable current paths as safe outputs for up to 250 V AC (normally open contact)
1 positively guided N/C contact for up to 250 V AC
1 non-safety output as application diagnostic output for 250 V AC (normally open
contact)
2 non-safety outputs as semiconductor application diagnostic outputs for 24 V DC
Always ensure the MOC3ZA setting is safe in the context of your application!
You are responsible for the correct setting of the MOC3ZA in relation to the voltage
threshold U
and standstill time t
an
corresponding tests under worst-case conditions.
Test the suitability of the motor!
If the motor current is gradually reduced to zero by a frequency inverter or soft starting
device, the motor may be demagnetized. In this case check whether the remaining
remanence voltage is sufficient to ensure correct standstill detection.
) and the standstill time (t
an
. The correct setting must be determined by
s
Operating instructions
MOC3ZA
: time delay
s
8014608/1DS0/2022-02-16
Subject to change without notice
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