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Moisture parameters
Temperature Range
Humidity Range
3K3
0~+40℃
5%～85%
4K2
-33~+40℃
15%～100%
4K4H
-20~+55℃
4%～100%
Level
Environment category definition
Outdoor : the ambient air temperature is -20~50 , Relative humidity range is 4%to 100%，applied to PD3
Indoor unconditioned: the ambient air temperature is -20~50 , Relative humidity range is 5%to 95%,applied to PD3
Indoor conditioned: the ambient air temperature is 0~40 , Relative humidity range is 5%to 85%,applied to PD2
℃
℃
℃
Pollution degree definition
Pollution degree 1: No pollution or only dry, non-conductive pollution occurs. The pollution has no influence.
Pollution degree 2: Normally only non-conductive pollution occurs. Occasionally, however, a temporary conductivity caused by
condensation must be expected.
Pollution degree 3: Conductive pollution occurs, or, dry, non-conductive pollution occurs which becomes conductive due to
condensation which is expected.
Pollution degree 4: Persistent conductive pollution occurs, for example, the pollution cause by conductive dust, rain and snow.
Block Diagram of SDT4~10KW refer to figure 6.2-1:
6.2 Block Diagram
DC
EMI
Filter
DC
EMI
Filter
DC
Switch
MPPT1
Circuit
MPPT1
Circuit
3-level
Inverter
Circuit
LC
Filter
AC
EMI
Filter
AC Isolation Relay
Figure 6.2-1
7 Maintenance
Regular maintenance ensures a long operating life and optimal efficiency of the entire PV plant.
Caution: Before maintains please disconnect the AC breaker firstly and then disconnect DC breaker. Wait 5 minutes until the residual
voltage has been drained.
7.1 Cleaning
DT series inverter is fitted with two fans on its left side. The fan intakes and handle covers should be cleaned yearly with a vacuum
cleaner. For more thorough cleaning, completely remove the fans.
Disconnect the AC breaker firstly and then disconnect DC breaker.
Wait 5 minutes until the residual voltage has been drained and the fans are no longer turning.
Disassembly the fans (refer to Figure 7.1-1).
1)Loosen the five M4 screws with a crosshead screwdriver, then remove the fans out the cabinet about SOmm slowly.
2)Dpen the lockers of the two fan connectors and remove them from housing, then take the fans away.
Clean the ventilation grid and the fan with a soft brush, a paint brush, a cloth, or compressed air.
Reassembly the out fans into cabinet.
Please use towel to clean the heatsink once a year.
7.2 Checking the DC Switch
DC switch does not require any maintenance.
It is recommended, though not compulsory, to:
Check the DC switch regularly.
Activate the DC switch 10 times in a row once a year.
Operating the switch will clean the contacts and will extend the life of the DC switch.
Boot order
1. Turn on the breaker on AC side.
2. Turn on the DC switch.
3. Turn on the breaker on DC side.
Caution: if there is no switch, operate from step 1 to step 3.
shutdown order
1. Turn off the breaker on AC side.
2. Turn off the DC swiuh.
3. Turn off the breaker on DC side.
Caution: if there is no switch, operate from step 1 to step 3.
7.3 Checking the Electrical Connection
1. Check if the AC or DC wire is loose.
2. Check if the earth wire is reliable grounding.
3. Check if the waterproof covers of RS485 and USB port is fasten.
4. Please use torque wrench to tighten theAC and battery terminal wiring connectiono Followed 3.4 torque instruction.
Caution: Maintenance cycle is once half a year.
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