Honeywell VARIODYN D1 Installation Instruction page 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.
L1
L2
L3
N
1 3 5 7
11
A1
1
A2
12
2 4 6 8
PE
L1 L2 L3 N
MSU
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)
FB 798663.GB0 / 05.19
Installation Instruction VARIODYN
L1 L2 L3 N
2
12
14 11 24 21
11
®
D1 System
45