Installation Instruction VARIODYN
®
D1 System
FB 798663.GB0 / 05.19
45
6.3.1 Protection against a break in the neutral wire
The neutral conductor monitoring module (Part No. 584970) should be used to protect against a break in the
neutral conductor occurring. This module is connected upstream with the MSU contactor (Part No. 584971) and
enables the safe and immediate all-pole interruption of the power supply in the event of:
•
undervoltage
•
phase failure
•
asymmetry, including for reverse voltage
•
neutral conductor missing in the system
•
neutral conductor break in the device supply cable
•
neutral conductor mixed up with phase
The control panels must only be connected to the mains by qualified electricians and in compliance with all
relevant standards and guidelines.
M
AI
NS
m
ax
.
3 x
18
A
L1 L2 L3 N
PE
L1
L2
L3
N
1 3
5
2 4 6 8
L1 L2 L3 N
12
11
14
11
24
21
11
12
1
2
MSU
7
A1
A2
Fig. 38: Wiring example – protection against break in neutral conductor
Protection (Part No. 584971)
Neutral conductor monitoring module (Part No. 584970)
MSU
Main-Switch-Unit (MSU) (Part No. 583371.21)