Jntech JNP370LS-V1 Original operating instructions

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

·I·
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·II ·
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