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Chapter 3
WARNING
54
© SICK AG • Industrial Safety Systems • Germany • All rights reserved
Product description
PWR A1/A2
Motor speed or
voltage on L1/L2/L3
Wire break
on L1/L2/L3
13/14
23/24
33/34
53/54
ON
41/42
ERR
3.5
External device monitoring (EDM)
The static external device monitoring monitors whether the positively guided contactors
have dropped out prior to enabling the output circuits. The N/C contacts for the external
device monitoring are connected between S1 and X1.
Operate the terminals S1/X1/S2 with volt-free contacts!
The terminals S1/X1/S2 have no electrical isolation in relation to the measurement circuit
L1/L2/L3. They must therefore be operated with volt-free contacts with isolation to suit
the measurement circuit L1/L2/L3. Otherwise the safe function of the Standstill Monitor
MOC3ZA is not ensured (see chapter 5 "Electrical installation" on page 59).
If external device monitoring (EDM) is not required, a jumper must be fitted to terminals
S1/X1.
t
t
E
E
Standstill time t
s
Test time on switching on PWR
Operating instructions
MOC3ZA
Voltage threshold U
an
Test time for the
input signals
t
= 2 ... 2.5 s
E
8014608/1DS0/2022-02-16
Subject to change without notice
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