Hitachi WJ Series

Chapter 5 Wire Connection
5-3-6
5.3.4 Wiring of DC Link Choke (DCL)
 How can noise be reduced?
 What is the measures against harmonic noise?
 How can power factor be improved?
 When using a DC link choke (DCL), connect it after removing the short-circuit bar between
[PD/+1] and [P/+] terminals.
 The power factor can be improved, and harmonic noises can be reduced by using DC link
choke (DCL).
Cautions for DC link choke connection terminals (PD/+1, P/+)
P/+
PD/+1
Short-circuit bar
DC link choke
(Option)
Short-circuit
bar
P/+
PD/+1
Caution
 If the short-circuit bar between [PD/+1] and [P/+] terminals is removed and
the DC link choke (DCL) is not connected, power is not supplied to the main
circuit part of the inverter and the inverter cannot be operated.
Prohibited
 When the DC link choke (DCL) is not used, do not remove the short-circuit bar
between [PD/+1] and [P/+] terminals.
Do
 The wiring length to DC link choke (DCL) should be within 5 m. Otherwise, it
may not perform efficiently.
 When installing the DC link choke (DCL), please make sure that its heat does
not affect the inverter.
A
Q
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