CHINT NXZ Series User manual

NO:2021.04
Standard: IEC/EN 60947-6-1
User Instructions
NXZ Series
Automatic Transfer Switch

Safety Warning
1
2
3
4
Only professional technicians are allowed for installation and maintenance.
Installation in any damp, condensed-phase environment with inflammable
and explosive gas is forbidden.
You are prohibited from touching the conductive part when the product is
operating.
Do not install the product at places where gas medium can cause metal
corrosion and insulatin damage.
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.
To avoid dangerous accidents, the products should be installed and
secured according to the instructions.
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.
5
6
7

1
2
Applicatin Information
a) The normal operating ambient temperature of the product is - 5 ℃ ~ + 40 ℃;
Note: if it is used within the range of - 35 ℃ ~ + 70 ℃, please consult with the manufacturer.
b) If the altitude exceeds 2,000m, please consult with the manufacturer;
c) Class of pollution: Class 3;
d) Main circuit installation category:Ⅲ
e) Enclosure protection class: IP20.
;
Inspection and Test
01
NXZ Automatic Transfer Switch
Inspection
Determine product technical parameters.
Necessary tools
Cross screwdriver
Straight screwdriver
Outer hexagon
Figure 1 Inspection
2m
M3×12,M3
M4×60,M4 M5×70,M5
×1
×1
×3 ×1
×3 ×1 ×1
M8×100,M8
Product model NXZ-125 NXZ-250 NXZ-630 Note
Specification
of mounting
screw and nut
Standard
Flash
barrier
3P
4P
4
8
9
5
6
1
1
2
2
External
signal
terminal
Type
A
Type
B
Wire
Wire holder
Wire holder
mounting
screw
Mounting
screws and
nuts
Optional, for split
type installation of
display module,
indicated when
ordering.
Tabla 1 Standard accessories

NXZ Automatic Transfer Switch
02
The installation, operation and maintenance of the product are only carried out by
qualified professional.
Double switch off position ① ②
Normal switch on position Standby switch on position
③④
Manual debugging
Power -on test
Setting state mode Start-up mode of generator
Move the orange
button to the
operating
position
Automatic mode
＋
-
＋
-
SET
＋
-
AUTO GENERATCR
AUTO
on on
OFF
SET
ON
OFF
AUTO
MANU
I II
I
II
on on
OFF
SET
ON
OFF
AUTO
MANU
I II
I
II
on on
OFF
SET
AUTO
MANU
I II
Figure 2 Manual debugging
Figure 3-1 Power -on test

03
NXZ Automatic Transfer Switch
A B B1 E F GL H H1 H 2 H 3 H4 A1 Dd
Start-up mode of fire control
Manual mode
＋
-
＋
-
STOP
B(max)
B1
D
A(max)
A1
E
F
L
G
H4
H(max)
H1
H2
H3
＋
-
Normal Standby
Duplexing
Setting
Automatic
Manual
2XØd
3
Outline and Installation Size
Outline and Installation Size of NXZ-125 630~
Unit: mm
Product
model
Outline size Installation size
NXZ-125
NXZ-250
NXZ-630
245
295
436
130
175
272
220
304
461
30
35
58
4.5
6
9
5.5
8
13
126
175
230
21
29
41
71
99
131
107.5
146
192
21
29
41
229.5
275
400
113
152
240
4.5
6
9
21.5
27.5
43
MANU
on on
OFF
SET
ON
OFF
AUTO
MANU
I II
I
II
AUTO
on on
OFF
SET
OFF
AUTO
MANU
I II
I
II
OFF
Figure 3-2 Power -on test
Figure 4 Outline and Installation Size of NXZ-125~630
Tabla 1 Manual debugging

NXZ Automatic Transfer Switch
04
1 The phase sequence of normal and standby power supply must be
consistent. Phase N wiring cannot be wrongly connected. Normal
power supply has priority over standby power supply in terms of wiring
of power line end.
The front end of the normal and standby main circuit of the product
shall be equipped with SCPD (fuse) produced by the company
consistent with the identification on the product nameplate or SCPD
(fuse) with the same breaking capacity.
2 For the wiring of the load end of 3P product, the N pole is not
connected, and the wiring of its power line end is same as 4P product.
During wiring, incorrect N-pole wiring may result in the
burn-out of the controller!
Main circuit conductor
Normal power bus Alternative power bus.
Load bus
4P product wiring diagram
Main
circuit
Normal power supply I Normal power supply Ialternative power supply II alternative power supply II
1 3 5 N1 3 5 N1 3 5 N1 3 5 N
3Pole 4Pole
4
Installation and Wiring
Installation method
Figure 5 Installation method

NXZ Automatic Transfer Switch
≤a
≤b
≥φc≤a
≤b
≥φc
abc
NXZ-125
NXZ-250
NXZ-630
8
10
15
21.5
27.5
43
6
8
12
2
25~50mm
70~120mm2
185mm (≤320A)
2
240mm (400A)
2
150mm (500A)
2
185mm (630A)
2
6N·m
12N·m
5610
30N m·
M6×16
M8×20
M12×35
NXZ-125 NXZ-250 NXZ-630
1
1
1
1
2
2
Wire connection
Unit: mm
Product model Cable specifications Number of conductors allowed
to be clamped into the terminal
Product model
Specification of binding screw
Torque
Wrench
05
Figure 6 Wire connection
Tabla 3 Sectional area, width and number of copper wire

NXZ Automatic Transfer Switch
06
Note: Only communication terminal wiring is added to type B controller
on the basis of the signal and control terminal wiring of type A controller.
RS485
Active AC230V/0.5A
Indication of normal state Indication of alternative state
Normal neutral
Power signal Power signal Alternative neutral Closing signal Closing signal
The user should connect corresponding terminal as needed
Passive input
Passive output Passive contact
Note: The dash line refers to the internal circuit of controller
Auxiliary power
supply
Fire control
signal
Control of power
generation start-up
Auxiliary power
Passive Input Passive Output
Fire Linkage Control
Split interface
Generator control
II Power indicator
Passive outputAC230V Output
I Power indicator
Signal and control terminal wiring
Figure 7 Type A controller
AC230V Output

07
NXZ Automatic Transfer Switch
Used in grid - power generation mode only
and connected to the generator as needed,
or omitted. In case the normal power supply
fails,terminals 502 and 503 are connected.
1.Used in grid - power generation mode and may be omitted, but the
delay of generator start-up defaults to 0s.
2.Communication terminal wiring must be connected.
Normal neutral
Normal power supply
Normal closing
Alternative neutral
Alternative power supply
Alternative closing
To fire control room
State of internal contact
of the normal controller
of normal power supply
To the remote power
of generator
Connected to upper computer (RS485)
Terminals 401 and 402 can only be connected to passive signal.
If the fire control signal is active signal, the normally open contact of
relay must be connected to the controller after switching through the
relay. Terminals 403 and 404 are connected after the duplexing of fire
control. After the fire control signal being removed, the normal
operating state can be restored by pressing any key on the controller.
+ -
RS485
+ -
Figure 8 Type B controller
Typical application
Auxiliary power
Passive Input Passive Output
Fire Linkage Control
Split interface
Generator control
II Power indicator
Passive output
AC230V Output
I Power indicator
AC230V Output
Figure 9 Typical application

NXZ Automatic Transfer Switch
08
1. Any form of electrical connection is prohibited between the two groups of terminals; otherwise it may result in the burn-out of controller!
Indication of normal state Indication of alternative state
2. Terminals 401 and 402 of type A and type B controllers can be connected with passive closing signal only to achieve fire control
linkage. If they are directly connected to any active signal, the controller will be burnt out.
① The product is in the state. Move the orange button
the manual position.
to
② Pull out the limiting piece and lock it.
5
Installation of Isolation Padlock
Figure 10 Installation of isolation padlock

09
NXZ Automatic Transfer Switch
54
109
127
829
6
Split-type Display Module
Outline size
127
111~112
55~56
2Xφ3.5
Installation cabinet opening size (mm)
Figure 11 Split-type display module
Figure 12 Installation cabinet opening size

NXZ Automatic Transfer Switch
10
3
2
0.8N·m
ST2.9
4
2 nuts
2 screws
Note: The nuts are installed by fastening screws on the back.
0.9N m·
M3
5 6
7
12
2
Split (cabinet surface) installation of display module
Figure 13 Split installation of display module

NXZ Automatic Transfer Switch
AUTO MANU
ON
OFF
Over
Under
Over
Under
ON
OFF
SET GENERATOR STOP ＋
-
Ⅰ on
OFF
on Ⅱ
SET
AUTO
MANU
7
Display and Operation Interface
Description of the operation interface of controller display module
① Indication of automatic and manual operating modes;
② Indication of state setting;
③ Indication of generator start-up signal;
④ Indication of fire control linkage function start-up;
⑤ The display area of normal power state parameters shows normal supply voltage parameters with
switching delay time in the state and of operation , and shows setting items parameters in the setting
state;
⑥ The display area of alternative power state parameters shows standby alternative voltage parameters
and return delay time in the operating state and setting parameters in the setting state;
11
⑦ Setting button (press this button to enter the parameter setting menu of controller);
⑧ Select button of automatic / manual switching mode
It is used to select the automatic / manual switching mode in normal use and to save and exit in the
setting state;
⑨ Off button
In the manual control mode, if any of the two circuits of power supply is normal, press this button to
switch to the off position, while in the setting state, this button is used to set parameter decrease;
⑩ Switching button of normal power supply
In the manual control mode, if the switch is in the alternative position, press this button to switch to
the normal power supply, while in the setting state, this button is used as the page-up button of
setting items;
Switching button of alternative power supply
In the manual control mode, if the switch is in the normal position, press this button to switch to the
alternative power supply, while in the setting state, this button is used as the page-down button of
setting items;
+button
This button is used to set parameter increase in the setting state.
Ⅰ
Ⅱ
Figure 14 Display and operation interface

NXZ Automatic Transfer Switch
12
Parameter setting of controller display module
AUTO
MANU
For setting of the switching value of normal power supply
undervoltage, press to increase and to decrease.
＋
For setting of the switching value of normal power supply
overvoltage, press to increase and to decrease.
＋
For setting of switching delay, press to increase and
to decrease.
For setting of the switching value of alternative power supply
undervoltage, press to increase and to decrease.
＋
＋
SET
AUTO
ON
OFF
For setting of the switching value of alternative power supply
overvoltage, press to increase and to decrease.
＋
For setting of return delay, press to increase and
to decrease.
＋
For setting of the delay of generator stop, press to
increase and to decrease.
＋
For setting of the delay of generator start-up, press
to increase and to decrease.
＋
For setting of switching mode, press and keys to change the
switching mode (if the last digital is 0, it refers to grid - grid automatic
charge and automatic recovery; if the last digital is 1, it refers to automatic
charge and no automatic recovery; if the last digital is 2, it is grid - power
generation mode).
＋
I
II
SET
AUTO
MANU
AUTO
MANU
AUTO
MANU
AUTO
MANU
AUTO
MANU
AUTO
MANU
AUTO
MANU
AUTO
MANU
SET
SET
SET
SET
SET
SET
SET
SET
Figure 15 Parameter setting of controller display module

For setting of communication address, press to increase and
to decrease.
For setting of parity check, 0 refers to no check, 1 refers to odd
parity, and 2 refers to even parity.
Setting of baud rate: 1:2400 2:4800 3:9600 4:19200
5:38400
＋
NXZ Automatic Transfer Switch
13
AUTO
ON
OFF
I
II
AUTO
MANU
SET
AUTO
MANU
AUTO
MANU
AUTO
MANU
SET
SET
SET
SET
(Note: Please ask our after-sales service staff for communication protocol.)
■ Button instruction:
When the controller is in operation, press th e s ett ing bu tto n t o s et the interface of
parameter setting menu, and press “ ” and “ ” in the setting menu to page up / down
the setting items. Press the automatic / manual button to exit the setting menu; press “ ”
and “ ” to modify parameters.
＋
Note: The parameter settings for display module and communication function default as follows:
Setting of undervoltage switching value: Default to 187V, user-settable 160V~200V;
Setting of overvoltage switching value: Default to 263V, user-settable 240V~290V;
Setting of switching delay: Default to 5s, user-settable 0s~300s;
Setting of return delay: Default to 5s, user-settable 0s~300s;
Setting of generator start-up delay: Default to 5s, user-settable 0s~300s;
Setting of generator shutdown delay: Default to 5s, user-settable 0s~300s;
Switching and power mode: Default setting: automatic charge and automatic recovery (grid - grid), and user
can set automatic charge and no automatic recovery (grid - grid), automatic charge and automatic recovery
(grid - power generation);
Default parameter setting for communication function: address: 1; baud rate: 9600bps; parity check bit: odd
parity; data bits: 8; stop bit: 1.
Figure 16 Parameter setting for communication function

NXZ Automatic Transfer Switch
Normal operation of
normal power supply
Failure of normal
power supply T1
Disconnection of
normal power supply
Disconnection of
normal power supply
Disconnection of
normal power supply
Power up of alternative
power supply
Connection of alternative
power supply
Connection of alternative
power supply
Connection of alternative
power supply
Recovery of normal
power supply T2
Normal operation of
normal power supply
Normal operation of
normal power supply
Start-up of generator
Generator output reaches
set value T1
Failure of alternative
power supply T2
Power supply of
alternative power source
Recovery of normal
power supply T2
Disconnection of
alternative power supply
Disconnection of
alternative power supply
Disconnection of
alternative power supply
Power up of normal
power supply
Power up of normal
power supply
Power up of normal
power supply
Power up of normal
power supply T4
Connection of normal
power supply
Connection of normal
power supply
Connection of normal
power supply
Generator shutdown
Flow Chart of Automatic Charge and Automatic
Recovery (Grid - Grid) of Controller
Flow Chart of Automatic Charge and No Automatic
Recovery (Grid - Grid) of Controller
Flow Chart of Automatic Charge and Automatic Recovery
(Grid - Power Generation) of Controller
Failure of normal
power supply T1
Failure of normal
power supply T3
Power up of alternative
power supply
Power up of alternative
power supply
Recovery of normal
power supply
Motion flow of controller
14
I: Normal power supply
II: Alternative power supply
T1: Switching delay time
Failure of normal power supply, time before
disconnection of I
T2: Return delay time
Recovery of normal power supply, time before
disconnection of II
T3: Generator start-up delay time: 0s~300s
adjustable
T4: Generator shutdown delay time: 0s~300s
adjustable
Figure 17 Motion flow of controller

NXZ Automatic Transfer Switch
8
Installation of Flash Barrier
15
Inter-phase flash barrier
①Be sure to install flash
barriers before product
operation.
Do not operate the
product with wet
hands.
Check if the wiring is
correct.
After installation, the
insulation resistance to
the ground shall not be
less than 10mΩ.
Before insulation test,
please pull out the
product controller first.
②
③
④
9
Common Faults and Solutions
Table 4 Non-common Faults and Solutions
Description Causes and solutions
The state of fire control linkage remains after the fire
control linkage signal of terminals 401 and 402 of the
controller is removed.
When the normal power supply or alternative power
supply fails, the product cannot be manually or
automatically switched to the failed circuit of power supply.
In automatic state, when the normal power supply recovers
from the fault to the set undervoltage switching value, the
product does not switch automatically.
After the signal is removed, the user needs to press any
key to exit the fire control linkage state and resume the
normal state of operation.
The controller will not switch on and connect to the failed
power supply either manually or automatically when it
identifies the failure of normal power supply or alternative
power supply, unless it is switched on with the handle.
The undervoltage switching value and recovery value of
the controller have +10V return difference, and the
overvoltage switching value and recovery value have -10V
return difference, so the power supply recovery value must
exceed the switching value plus the return difference.
Figure 18 Inter-phase flash barrier

NXZ Automatic Transfer Switch
16
Table 5 Common Faults and Solutions
Description
The indicator lamp of controller is not
on after powering up.
Causes Solutions
Poor contact at incoming line terminal.
Failure of the fuse on the controller.
Make sure the incoming line terminal is
firmly connected and in good contact.
Install a new fuse.
Phase loss of controller. Corresponding phase voltage is lower
than the set undervoltage.
Eliminate the wiring failure.
Poor contract of corresponding phase
wiring.
Power failure, switch to the normal
power supply.
The controller displays the failure of
normal switch in switching. The controller is in manual state. Move the orange button to the electric
position.
The controller displays the voltage of
phases A, B and C above 300V.
One circuit of power supply of the
product is not connected to the zero
line or the N pole of the product is
connected to the live wire by mistake.
Conduct wiring correctly as per the
instructions (main circuit). Incorrect
connection to the live wire may burn
out the controller.
10
Warranty
Under the normal storage and transportation conditions and on the premise that the product
packaging or product itself is in good condition, the warranty period of the product is 36 months from the
date of production, and the following situations are not covered by the warranty:
1)Damage caused by user’s improper use, storage and maintenance.
2)Damage caused by the organization or personnel not designated by the company or by the user's
own dismounting and repair.
3)The product exceeds the warranty period.
4)Damage caused by force majeure.
11
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.

QC PASS
Test date: Please see the packing
ZHEJIANG CHINT ELECTRICS CO., LTD.
NXZ
Automatic Transfer Switch
IEC/EN 60947-6-1
PD1 Check 15
17
NXZ Automatic Transfer Switch

NXZ Series
Automatic Transfer Switch
User Instructions
Zhejiang Chint Electrics Co., Ltd.
Add: No.1, CHINT Road, CHINT Industrial Zone,North Baixiang,
Yueqing, Zhejiang 325603,P.R.China
E-mail: [e-mail]
Website: http://en.chint.com