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■ Optional installation
(1) When applying the option, check the catalog and technical manual, etc. for the applicable
model and the number of installable models and use it correctly.
(2) Side-on type options of the standard HC series
(Auxiliary Relay unit CXS-2 and interlock unit UR-02)
when installing, Remove the lid of the groove next to
the main unit with a tool such as a flat-blade
screwdriver before installing. (See figure on the right.)
※The Auxiliary Relay unit can't be installed on the
right side of the HC20. The groove on the right side
of the HC20 is dedicated to the interlock unit, so
remove the lid only when using the interlock unit. If
the Auxiliary Relay unit is accidentally installed on
the right side, it will be damaged during operation
and may cause a malfunction.
(3) The Auxiliary contact unit can be installed side-on and head-on at the same time, but please
note that the number of additional contacts is limited.
Model
XC4M, HC8M, HC10M
Coil Type
Side-on
Head-on
Maximum
4contacts
installations
The HC35 and HC55 don't have Auxiliary contacts on the main body, and there is one side-on
(※)
unit on each side as standard, making it 2NO+2NC.
contacts, including the standard 2NO+2NC.
4. Maintenance
(1) Turn off power when maintenance. Can cause electric-shock.
(2) Check whether screw is fully tightened. If a loose, tighten more. Can cause heating.
(3) Check the insulation resistance between phases and ground. If it is degraded, replace the product.
(4) Check by manually operation that the Contactor is not got into foreign substance, such as a
washer and wire.
(5) Don't disassemble Contactor and Thermal Relay. The contacts of Contactor other than
HC55 cannot be visually checked unless they are completely disassembled. Inspect the contact parts
only for electrical inspections such as continuity inspections and visual inspections near the contacts.
(6) Remove dirt and dust from each part. Be careful not to disconnect the contacts.
(7) During trial running, check whether there occurs abnormal noise, abnormal smell.
(8) For maintenance details, please refer to the instructions described in the technical manual.
5. Notes
Detailed handling information and installation procedures related to options are also described in
the technical manual. You can download it from the following, so please refer
to it as well. We are sorry, but the technical manual is only available in the
Japanese version.
（URL：https://www.hitachi-ies.co.jp/products/hdn/mgsw/download/index.html）
Table5. Auxiliary Relay unit maximum number of installations
Economy model
AC
DC
Per side 1pcs
1pcs
4contacts
XC4,
HC10M-GP
HC8,HC10
DC
Per side 1pcs
1pcs(Can't be attached with latches )
6contacts
2contacts
NO：Max 3contacts
NC：Max 3contacts
The maximum number of installations is 8
Standard model
HC20
AC and DC
Left side 1pcs
6contacts
NO：Max 3contacts
NC：Max 3contacts
HC35, HC55
(※)
AC
DC
2pcs
1pcs
each
each
side
side
8contacts(※)
NO：Max 4contacts
NC：Max 4contacts
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