Jntech JNP370LS-V1 Original operating instructions

I
Quick Installation
JNP370LS-V1
JNP550LS-V1
QI-JNP-550LS-V1-EN-V1.0
Solar pumping inverter

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Contents
1 Inverter unpacking................................................................ 1
2 Installation procedure...........................................................2
2.1Prepare installation tools............................................. 2
2.2 Installation Direction and spacing dimension..........2
2.3 Installation of Inverter................................................. 3
3 Electrical Connection........................................................... 5
3.1 Connecting Terminals of Inverter.............................. 5
3.2 Cable Selection for Electrical Connection............... 6
3.3 AC Side Electrical Connection.................................. 7
3.3.1 Single phase pump description..........................7
3.3.2 Capacitor removal example................................9
3.4 DC side connection................................................... 11
3.5 Inverter grounding..................................................... 13
3.6 Water Level Sensor Connection............................. 14
3.6.1 Water level sensor interface define...............14
3.6.2 Water level sensor connection....................15
4 Disassembling.....................................................................17
4.1 The Disassembling of PV Connector..................... 17
5 Commissioning................................................................... 17
5.1 Verify before Commissioning.................................. 18
5.2 Inverter first commission.......................................... 20
6 Appendix: Troubleshooting................................................22

1
1 Inverter unpacking
Check according to Packing List whether all the parts are
correct and in good condition or not. Accessories are
shown as below:
Figure 1-1 inverter and common accessories
Table 1-1 description of inverter and common accessories
No
Description
No
Description
1
Solar pumping inverter
7
Packing list
2
Blue ring tool
8
Water level sensor A
3
Expansion bolt
9
Quick installation
guideline
4
PV connector
10
Water level sensor B
5
Water pump connector
11
Certification of
inspection
6
Sensor and
communication
connector (Option)

2
2 Installation procedure
2.1Prepare installation tools
The following tools will be needed during inverter
installation and wire connection.
Table 2-1 recommended tools for inverter installation and
conductor installation
Sketch map
Name
Recommend
specification
Function
MC4 wire
crimpers
M2.5~M8
Used for PV connector
wire core pressure
welding.
Electric drill
Ф8
Used for inverter
installation plate fixed
hole drilling.
Straight
screwdriver
Ф3
Used for the AC wire
installation.
Cross
screwdriver
Ф5
Used for
disassembling inverter
cover.
Hammer
6 pound
Used for expansion
bolt
2.2 Installation Direction and spacing
dimension
The inverter shall be installed vertically or tilted backwards
with a maximum angle of 10°.

3
Figure 2-2 installation orientation
The minimum installation spacing dimensions are shown
below:
Directio
n
Minimum
space
Direction
Minimum
space
Above
100cm
Sides
100cm
Below
100cm
Front
100cm
2.3 Installation of Inverter
Step 1：
Drill holes in the
selected installation
position with
1200mm for two
holes of Ф8.

4
Figure 2-3 installation diagram
Step 2:
Use hammer to make
expansion bolt in
the holes.
Step 3:
Align the lifting lug of
the water pump inverter
with the expansion
screw, hang it, and
finally tighten the
expansion
bolt.expansion nut.

5
3 Electrical Connection
3.1 Connecting Terminals of Inverter
Input and output terminals is on the bottom of the
inverter, including DC input and AC output terminal, RS
485 communication and water level sensor terminals,
shown as below:
Figure 3-1 schematic diagram of external connection of
inverter
Table 3-2 connection terminal marking:
Terminals
Description
PV+/ PV-
PV array DC positive/negative input terminals
MOTOR
Output terminal, connect with AC pump
SENSOR
Water level sensor signal input terminal
(optional)
Grounding terminal

6
Table 3-3 selection of DC circuit breaker:
Model
Recommended parameters of DC circuit
breaker
JNP370L
440VDC,20A
JNP370LS
440VDC,20A
JNP550L
440VDC,20A
JNP550LS
440VDC,20A
Notice!
1. It must be DC breaker, it’s prohibited to be
replaced by AC breaker;
2. Shown as right side picture DC breaker
should be 2 stages.
3.2 Cable Selection for Electrical
Connection
Table 3-4 users can select the electrical connection cable
according to the following specifications:
Model
Cable range（AWG）
DC side
AC side
PV+、PV-
U、V、W
PE
JNP370L
14-12
14-12
12
JNP370LS
14-12
14-12
12
JNP550L
14-12
14-12
12
JNP550LS
14-12
14-12
12
PV+
PV+
PV-PV-
DC Breaker

7
3.3 AC Side Electrical Connection
Step 1: AC connectors plug into Inverter bottom AC side
terminal, tighten connectors. From AC connectors there
are U,V,W wires to connect with AC pumps U,V,W
wires .JNP370L and JNP550L drive the three-phase water
pump, and JNP370LS and JNP550LS drive the
single-phase water pump. Note Special precautions for
driving single-phase water pump, as shown in 3.3.1.
Fig. 3-5 connection diagram of inverter water pump
terminal
3.3.1 Single phase pump description
Single phase pump is widely used in household and small
power water delivery system with its advantages of simple

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structure, low cost, low noise, easy access to power, etc.
Usually, single phase pump consists of a main winding
(running winding), a secondary winding (starting winding),
and a starting capacitor.
Note: Some single phase pump consists of two capacitors,
one starting capacitor and one running capacitor. In the
connection of single phase pump, this two capacitors are
always connected together, after that, the connection is
same as one capacitor pump. No further description here.
Fig. 3-6 Diagram of single phase pump inner winding
Use the company JNPXLS photovoltaic pump series
inverter, driving customers themselves with the single
phase of buy pumps need to affirm the startup capacitor of

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single-phase water pump to remove, and then in the main
winding and the auxiliary winding public side leads to a
line, the main winding and the auxiliary winding each lead
to a line, the other end to connect three wires and a
ground to inverter standard accessories Ac connector,
remove the capacitor schematic diagram as follows.
Fig. 3-7 Schematic diagram of removal for single phase
pump
3.3.2 Capacitor removal example
Step 1: Put the single pump on the open
and hard ground

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Step 2: Remove 4 fixing screws from end cover
plate with cross screwdriver and remove end cover
plate.
Step 3: After remove end cover, find the terminal
connected to the capacitor lead, loosen the
fastening nut and remove the original wire of
capacitor and motor.

11
3.4 DC side connection
Danger!
When carrying the out connection between PV array and inverter,
the PV array should be covered with opaque materials and the
DC-side circuit-breaker should be disconnected, otherwise, the PV
Step 4: Prepare a four-core motor extension wire,
fix the ground wire in the “ ” position, connect the
other three wires to the three terminals and fix
them with nuts. Finally, cover it.

12
array may generate dangerous voltage, cause casualty. The
Non-professionals do not make the connection operation.
Step1: Please connect the wire of DC connector
according to the following steps:
Operation instruction
Operation
demonstration
1．Unscrew the fastening nuts of
MC4
Connector.
2．Strip off the DC cable insulation
layer to a length of approx. 7mm.
Insert the exposed end of PV
Cable into the connector tube,
and press tightly with wire
crimpers.
Effect figure. Remember! ! !
Terminals and connectors match
the core, is not reversed.
3．Pull the above finished cable
with tube through the fastening
nut.
4．Plug it into the wiring slot until a
sound being heard, which
indicating plug into the right
place. Then tighten the nut.
Effect figure

13
Step2: Plug the positive and negative connector into the
corresponding terminals at the bottom of the inverter
respectively.
Figure 3-8 schematic diagram of inverter photovoltaic
connection
3.5 Inverter grounding
Make sure Inverter grounding terminals is properly
connected with grounding.

14
Figure 3-9 schematic diagram of inverter grounding
connection
3.6 Water Level Sensor Connection
3.6.1 Water level sensor interface define
Water level sensor connector pins in inverter panel port
are defined are shown below:

15
Fig. 3-10 connection diagram of inverter water level
sensor
Terminal
（SENSOR）
connector pin
Detail
DG
Dry protection pin.
SY
Overflow protection pin.
COM
Dry protection and Overflow protection
common pin.
3.6.2 Water level sensor connection
Two kinds of water level sensor you can select are shown
below:
Sensor ASensor B
If you selected water level sensor A, then water sensor
installation method is shown below:

16
Figure 3-11 detail of water level sensor A
Figure 3-10 detail of water level sensor A

17
If you selected water level sensor B, then water sensor
installation method is shown below:
Figure 3-12 detail of water level sensor B
4 Disassembling
4.1 The Disassembling of PV Connector
Please operate according to following:
Operation instructions
Demonstration picture
DC SWITCH should be OFF
before operation, and This blue
ring tool shall be used to
disconnect MC4