NXZM
、
NXZ(H)M Automatic Transfer Switch
6
Product troubleshooting
11
Table 5
Non-common fault and solution
Description
Causes and solutions
Controller display failure
Press Inquiry button. An indication of E-1 corresponds to
circuit breaker trip on the normal power supply side, and
that of E-2 corresponds to circuit breaker trip on the
alternative power supply side. the code (E-1/E-2) appears.
check if the main power supply has a short-circuit or a
overload failure
，
After elimination of the failure, switch
the product to the manual mode. Then press stop button
or rotate the handle to stop position then closing. And an
indication of E-3 corresponds to motor failure or motor
line disconnection. The code (E-3) appears, switch the
product to manual mode and press Normal or Alternative
button to confirm whether the product can be converted.
If not, repair or replace the product.
Table 6 Common failure and solution
Description
The display interface of controller is
not on after powering up
Cause
Solution
Poor contact at incoming line terminal.
Controller fuse is blown.
Make sure the incoming line terminal is
firmly connected and in good contact.
Replace the fuse.
The product still shows fire control linkage after the fire
control linkage signals are removed from 501 and 502
terminals of the controller.
After the signals are removed, switch the product to
manual mode and press Confirm/Return button. It is only
after this sequence that the controller will retreat from fire
protection linkage mode to normal operation.
When a fault occurs to the normal or alternative power
supply, the product fails to switch to the faulty power
supply automatically or manually.
After the controller detects a failure of the normal or
alternative power supply, it will not switch on the faulty
power supply in manual or automatic mode, unless a
closing is forced with the handle.
The product fails to automatically transfer in automatic
mode when the main power supply has recovered from a
fault to the under (over)-voltage transfer setting value.
There is a +10V return value between undervoltage
transfer value and recovery value, and a -10V return
difference between overvoltage transfer value and
recovery value. The recovery value for power supply must
be bigger than the total of transfer value and return value.
The product is not connected to neutral
phase, especially for a 3P product.
Make sure the incoming line terminal is
firmly connected and in good contact.
Phase loss or failure.
Check if the main circuit voltage is
normal.
The displayed voltage of phase A, B
and C is above 300V
One circuit of power supply of the
product is not connected to neutral
pole of the product is connected to
the live wire by mistake.
Conduct wiring correctly according to
the Instructions (main circuit). Wrong
connection will burn down the
controller.
