NO:2021.

04

NXZM、NXZ(H)M
Automatic Transfer Switch

User Instructions

Standard: IEC/EN 60947-6-1

 Safety Warning
1 Only professional technicians are allowed for installation and maintenance.

2 Installation in any damp, condensed-phase environment with inflammable

and explosive gas is forbidden.

3 You are prohibited from touching the conductive part when the product is
operating.

4 Do not install the product at places where gas medium can cause metal
corrosion and insulatin damage.

5 After installing the product, finishing the inspection of load side line and
splitting the fire-resistance circuit, the controller must be set to “Manual”
position and the product must be set to split position. Switch the controller
to “Auto” position after line fault is eliminated.

6 To avoid dangerous accidents, the products should be installed and

secured according to the instructions.
7 This product is applicable to environment A. The product will generate
harmful electromagnetic interference if used in environment B, in which
case, user should take proper protective measures.
 NXZM、NXZ(H)M Automatic Transfer Switch

1 Applicatin Information
a) The normal application temperature of the product is -5℃~+40℃;
Note: If you need to use the product under -25℃~+70℃, please consult the manufacturer.

b) If you need to use the product above 2000m altitude, please consult the manufacturer;
c) Pollution class: class 3;
d) Installation category of main circuit: Ⅲ;
e) Enclosure protection class: IP20.

2 Inspection and Test

Inspection

Tools required

1.Determine
Phillips screwdriver
product
technical
Word screwdriver
parameters.
Allen wrench 2.Type AT and
BT controllers
Hex wrench
have the
function of
communication.
Fig 1 Inspection

Tabla 1 Standard accessories

Product NXZM-63、125 NXZM-160 NXZM-250 NXZM-400、630 NXZM-800 Total

model NXZHM-63、125 NXZHM-160 NXZHM-250 NXZHM-400、630 NXZHM-800 (Pcs)

M6 X 12 M8 X 16 M8 X 16 M10 X 30 M12 X 35 3P 2X6

Wiring screw
4P 2X8

3P 2X4
Flash barrier
4P 2X6

Type A 5
wiring
terminal
of Type AT
6
external Type B
signal
(controller)
Type BT 7

split wire 2m (optional) 1

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 NXZM、NXZ(H)M Automatic Transfer Switch

Manual test

Turn the toggle switch to Off position Normal On position

the Manual position

Alternative Off position

On position Reset the handle

Fig 2 Manual test

Power-on test

Turn the toggle switch to Automatic mode Manual mode Setting mode
the Automatic position

Stop mode Generator activation Failure alarm Automatic transfer Automatic transfer
(absent for PC class) Operating transfer Return transfer
delay time delay time
Fig 3 Power-on test

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 NXZM、NXZ(H)M Automatic Transfer Switch

3 Outline and Installation Dimensions

Outline & installation dimensions

Hmax
A
C H1
L G H2

B2
B1

D
B

Fig 4 Outline and Installation Dimensions

Tabla 2 Outline and Installation Dimensions

Unit: mm

H H1 H2
Product model A B B1 B2 C D G L M N
S H S H S H

NXZM-63、125
300 240 230 223 267 220 25 178 178 190 151 161 47 56 9 17
NXZHM-63、125

NXZM-160
340 250 245 240 307 230 30 194 167 195 152 180 50 9 17
NXZHM-160

NXZM-250
390 250 367 240 357 230 35 225 181 216 155 190 49 50 9 17
NXZHM-250

NXZM-400、630
535 334 464 342 475 304 44 304 234 198 66 11 26
NXZHM-400、630

NXZM-800
660 344 477 344 600 314 58 385 238 203 68 11 26
NXZHM-800

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 NXZM、NXZ(H)M Automatic Transfer Switch

Dimensions of split module of controller and cabinet door

Unit: mm
64 17 4.5 60
105

101
60≤a≤62
101≤b≤103
Thickness≤2.5

Fig 5 Dimensions of split module of controller and cabinet door

4 Installation and wiring

Wire connection dimension

Fig 6 Wire connection dimension

Tabla 3 Wire connection dimension

Unit: mm

Product model a b c Torque

NXZM/NXZHM-63
8.0 17.5 6.5 4 N·m
NXZM/NXZHM-125

NXZM/NXZHM-160 7.5 16 8.5 10 N·m

NXZM/NXZHM-250 10 23.5 8.5 12 N·m

NXZM/NXZHM-400
10.5 30.5 11.5 30 N·m
NXZM/NXZHM-630

NXZM/NXZHM-800 15 43 14 40 N·m

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 NXZM、NXZ(H)M Automatic Transfer Switch

Tabla 4 Sectional area, width and number of copper wire

Unit: mm

Rated current 10 16 25 32 40 50 63 80 100 125 160 180

Cross-sectional
area of copper 1.5 2.5 4.0 6.0 10 10 16 25 35 50 70 95
wire or copper bar
The number of copper
1
wire or copper bar
Rated current 200 225 250 315 350 400 500 630 700 800
Cross-sectional
area of copper 95 95 120 185 185 240 150 185 240 240
wire or copper bar
The number of copper
1 2
wire or copper bar

Product wiring diagram

4P Product wiring diagram

Normal power bus-bar Alternative power bus-bar

Normal power Alternative power

Voltage signal
sampling line
Main power
supply

1. Main power
supply and
voltage signal
Load bus-bar 4P
sampling line
phase
3P Product wiring diagram sequence must
be consistent.
Normal power Alternative power
Normal Alternative 2. During
bus-bar bus-bar
power power wiring, the
Wiring terminal of
neutral line voltage signal
sampling line in
order as shown.
Wrong wiring
may lead to
burn down of
the controller.
3P
Load bus-bar

Fig 7 Product wiring diagram

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 NXZM、NXZ(H)M Automatic Transfer Switch

neutrul line
neutral line
Alternative
Connect to the external

Normal
terminal of controller
directly.
Any forms of electrical
connection of these terminals is
strictly forbidden.

Signal and control terminal wiring diagram

Common Common

201 202
1. Any type of
Note: Please tear off the sticker before use electrical
and keep it for future use. connection
between
terminal 201
and teminal
It is used under the 202 is
Grid-power generator
Note:
prohibited,
mode and may be omitted,
but the delay of generator
Do not connect Active output otherwise the
201 and 202. AC230V/0.5A
start-up default to 0s. controller will
be burnt!
2. Terminal 501
and 502 of
controller can
only be
Commom connectd with
passive closing
signal to
achieve fire
cintrol linkage.
If they are
directly
connected to
any active
signal, the
To the remote power

Used for Grid-Power generator Terminals 501 and 502 can

mode only and connected to the onlybe connected to passive
signal, optionally via a relay
controller will
generator as needed, In the case
of the normal power supply fails, contactor. be burnt.
of generator

terminal 601 land 603 are Terminals 503 and 504 are
connected. connected after the off of fire 3. Strip at least
control. After the fire control
Note: signal bering removed, for the
8mm of the
1: Dotted line is the internal structure of the controller. ATSE switch to“Manual”and insulation of
then press Confirm/Return in
2: Type A controller doesn’t have functions of generator control the wire before
automatic mode, or press
(601 602 603) and feedback output of fire protection control (503, 504). Comfirm/Return directly in inserting it into
3: Type AT and BT controllers have the function of communication.
manual mode. the terminal.
Fig 8 Signal and control terminal wiring diagram

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 NXZM、NXZ(H)M Automatic Transfer Switch

Installation of the display module (on cabinet door)

Fig 9 Installation of the display module

Installation of flash barrier

If a megameter with capacity over 500V

is used to measure the insulation
resistance of the circuit breaker, please
disconnect the secondary circuit of the
controller.
Fig 10 Installation of flash barrier

5 Controller setup
Instructions of controller operation interface

1 2 20 21 22 1 Indication of automatic working mode;

2 Indication of manual working mode;
3 Failure indication

4 When the breaker is tripped due to failure or short-

circuit of the switch, this lamp will be on; (absent for
5 9
class PC)
3 10
6 4 Display area of normal power voltage parameters
7 11
It displays normal power voltage parameters and
12
transfer delay time under the working condition, and
8 13
displaying symbols under the setting condition;
23
19 5 Indication of the on or off of breaker on the normal
power side, the light will flash if a failure of the
14 18
normal power occurs;

15 17 6 Indication of setting condition;

16 7 Indication of on or off of breaker on the alternative
power side, the light will flash if a failure of the
alternative power occurs;
Fig 11 Controller setup

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 NXZM、NXZ(H)M Automatic Transfer Switch

8 Indication of the start of stop function;

9 Unit of voltage time and frequency of the normal power;
10 Phase of A, B, C;
11 Unit of voltage, time and frequency of the alternative power;
12 Display area of alternative power voltage parameters
It displays alternative power voltage parameters and transfer delay time under the working
condition, and displaying symbols under setting condition;
13 Indication of the start signal of generator;
14 Confirm/return button
Press this button to save changes and exit in setting mode;
And restore normal operation status in fire protection linkage mode;
15 Button for compulsorily switch to the normal power
Under manual control mode, If the normal power supply is normal，press this button, it can
compulsorily switch to normal power;
If it is setting condition, this button is the “scroll up” button of setting programs;
16 Button for compulsorily switch to the alternative power
Under manual control mode, if the alternative power supply is normal, press this button, it can
compulsorily switch to alternative power;
If it is setting condition, this button is the “scroll down” button of setting programs;
17 Off button
Under manual control mode, if either line of both power lines is normal and press this button, it will
switch to the off position;
If under the setting mode, this button is the minus button for setting parameters;
18 Failure inquiry button
When the switch fails and malfunction lamp on the failure screen is on, press this button, the detail
malfunction code can be displayed in the screen;
19 Setting button
Press this button to enter into the parameter setting menu of the controller;
20 Indication of automatic charge and automatic recovery mode;
21 Indication of automatic charge and without automatic recovery mode;
22 Indication of generator (automatic charge and automatic recovery) mode;
23 Indication of communication status.

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 NXZM、NXZ(H)M Automatic Transfer Switch

Parameter setting for controller

Note: The parameter settings for display

For setting of the switching value of normal
power supply undervoltage,press to increase module and communication
and to decrease function default as follows:
1 Setting of undervoltage switching
value: Default to 187V, user-settable
For setting of the switching value of normal
power supply overvoltage,press to increase 160V~200V.
and to decrease
2 Setting of overvoltage switching value:
Default to 263V, user-settable
240V~290V.
For setting of the switching delay time,press
to increase and to decrease 3 Setting of switching delay: Default to
5s, user-settable 0s~180s.
4 Setting of return delay: Default to 5s,
For setting of the switching valueaof alternative user-settable 0s~180s.
power supply undervoltage,press to increase
and to decrease
5 Setting of generator start-up delay:
Default to 5s, user-settable 0s~180s.
6 Setting of generator shutdown delay:
For setting of the switching valueaof alternative
power supply over voltage,press to increase Default to 5s, user-settable 0s~180s.
and to decrease

For setting of the return delay time,press

to increase and to decrease

For setting of the delay time of generator

start-up,press to increase and to decrease

For setting of the delay time of generator

stop,press to increase and to decrease

For setting of switching modes,press and

Button instruction:
to change mode.(If the digital is 000,it refers to When the controller is in
grid-grid autormatic charge and automatic return;
if the digetal is 001,it refers to grid-grid automatic operation, press the set button
chargr and without automatic return;if the figital
is 002,it refers to grid-power generator mode) to set the interface of parameter
setting menu, and press“ ”
For setting of modbus communication address and “ ”in the setting menu
in the range of 1-247,press to increase and
to decrease to page up / down the setting
items. Press the comfirm/return
button to exit the setting menu;
For setting of modbus communication baud rate.
press“ ”and“ ” to
0:9.6kbps; 1:19.2kbps. modify parameters.

Remote locking:(on/off)default off.

Fig 12 Parameter setting for controller

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 NXZM、NXZ(H)M Automatic Transfer Switch

Controller operation process

Normal operation of
Normal operation of normal power supply
normal power supply
Failure of normal
Failure of normal power supply T3
power supply T1

Start-up of generator
Disconnection of
normal power supply
Generator output reaches
set value T1
Power up of alternative
power supply
Disconnection of
normal power supply
Connection of alternative
power supply
Power up of alternative
power supply
Recovery of normal
power supply T2
Connection of alternative
Disconnection of power supply
alternative power supply
Recovery of normal
Power up of normal power supply T2
power supply
Disconnection of
Connection of normal alternative power supply
power supply
Power up of normal
power supply

Connection of normal
Flow Chart of Automatic Charge and Automatic power supply

Recovery (Grid - Grid) of Controller Power up of normal

power supply T4

Generator shutdown
Normal operation of
normal power supply
Flow Chart of Automatic Charge and Automatic Recovery
Failure of normal
power supply T1 (Grid - Power Generation) of Controller

Disconnection of
normal power supply I: Normal power supply
Power up of alternative
power supply
II: Alternative power supply
T1: Switching delay time
Connection of alternative
power supply
Failure of normal power supply, time before
Recovery of normal
power supply
disconnection of I
T2: Return delay time
Power supply of
alternative power source
Recovery of normal power supply, time
Failure of alternative
before disconnection of II
power supply T2

Disconnection of
T3: Generator start-up delay time: 0s~180s
alternative power supply adjustable
Power up of normal
power supply T4: Generator shutdown delay time: 0s~180s
adjustable
Connection of normal
power supply

Flow Chart of Automatic Charge and No Automatic

Recovery (Grid - Grid) of Controller

Fig 13 Controller operation process

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 NXZM、NXZ(H)M Automatic Transfer Switch

6 Product troubleshooting
Table 5 Non-common fault and solution

Description Causes and solutions

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
Controller display failure 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.

After the signals are removed, switch the product to

The product still shows fire control linkage after the fire
manual mode and press Confirm/Return button. It is only
control linkage signals are removed from 501 and 502
after this sequence that the controller will retreat from fire
terminals of the controller.
protection linkage mode to normal operation.

After the controller detects a failure of the normal or

When a fault occurs to the normal or alternative power
alternative power supply, it will not switch on the faulty
supply, the product fails to switch to the faulty power
power supply in manual or automatic mode, unless a
supply automatically or manually.
closing is forced with the handle.

There is a +10V return value between undervoltage

The product fails to automatically transfer in automatic transfer value and recovery value, and a -10V return
mode when the main power supply has recovered from a difference between overvoltage transfer value and
fault to the under (over)-voltage transfer setting value. recovery value. The recovery value for power supply must
be bigger than the total of transfer value and return value.

Table 6 Common failure and solution

Description Cause Solution

Make sure the incoming line terminal is
Poor contact at incoming line terminal.
firmly connected and in good contact.

The product is not connected to neutral Make sure the incoming line terminal is
The display interface of controller is phase, especially for a 3P product. firmly connected and in good contact.
not on after powering up
Controller fuse is blown. Replace the fuse.

Check if the main circuit voltage is

Phase loss or failure.
normal.
One circuit of power supply of the Conduct wiring correctly according to
The displayed voltage of phase A, B product is not connected to neutral the Instructions (main circuit). Wrong
and C is above 300V pole of the product is connected to connection will burn down the
the live wire by mistake. controller.

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 NXZM、NXZ(H)M Automatic Transfer Switch

7 Environmental Protection
In order to protect the environment, the product or product parts should be disposed of according to
the industrial waste treatment process, or be sent to the recycling station for assortment, dismantling and
recycling according to local regulations.

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NXZM、NXZ(H)M Automatic Transfer Switch

QC PASS
NXZM、NXZ(H)M
Automatic Transfer Switch
IEC/EN 60947-6-1

PD1 Check 15

Test date: Please see the packing

ZHEJIANG CHINT ELECTRICS CO., LTD.

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NXZM、NXZ(H)M
Automatic Transfer Switch
User Instruction

Zhejiang Chint Electrics Co., Ltd.

Add: No.1, CHINT Road, CHINT Industrial Zone,North Baixiang,
Yueqing, Zhejiang 325603,P.R.China
E-mail: global-sales@chint.com
Website: http://en.chint.com