LS SV0008iS7-2, Руководство пользователя

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Chapter 4 Wiring
4-26
4.1.13 Input varistor and Y-CAP connection description
IS7 series include a filter which consists of Y-CAP and varistors between input phase and
grounding for surge absorption and lightning protection. However, in a non-grounded
power system that a special type of earth fault occurs frequently in the field, adequate
measures are required in order to avoid damage of inverter as shown in the table below.
Power supply system and a
grounding type
Varistors and Y-CAP
connection
Effect
Directly grounded system 2Pin connector(On)
Voltage stress and noise can be
reduced
Non grounded or impedance
grounded system
2Pin connector(Off)
Damage of inverter risk can be
reduced at the time of earth fault
Note
0.75~22KW(400V) and 0.75~75KW(200V) proudct do not support this function.
4.1.14 How to remove the front cover and set up on/off connector functionality
1) IS7 30~75KW(400V) product set up
If you use a connection switch off varistors and Y-CAP with 30~75KW(400V) product, be
sure to contact our sales team or a customer support team to receive action.
2) IS7 90~375KW(400V) product set up
After removing the keypad, release the left/right of the fixed bolt at the top of the front cover
and push up the front cover and open it. If you remove the front cover with the keypad
connected, the cable of keypad can be damaged. After removing the front cover, you can
select ON/OFF with 2Pin connector as shown in the figure below.
Caution
In order to prevent accidents, remove the switch after the internal voltage of the inverter power off
completely.
Switch can be removed if there are no lightning and incoming surge voltage on the system.
Front Cover
Keypad
SCR Snubber
Board
<Removing the front cover(Ex : 90~160KW)>
<Input surge protection and AC EMI Capacitor circuit>