Removing Electrical Components - Hitachi FSG Series Service Manual

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WARNING: TURN OFF all power source switches

2.1.12 REMOVING ELECTRICAL COMPONENTS

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DANGER
DO NOT touch the electrical parts when the LED3(Red) on the
SNUBBER PCB(PCB5) or the LED2(Red) on the Inverter
PCB(PCB3) is lit, since the voltage is higher than 50V.
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WARNING
1. When replacing transistor module (IPM) and diode module
(DM) on heat radiation fins, spread silicone grease (made
by Shinetsu chemical Co., KS61) lightly over the surface
touching fins.
2. Identify terminals Nos. with the mark band Nos. when
reassembling. If incorrectly connected, malfunctions or
damages of electric components will occur.
3. Correctly insert two wires of U and V phases for the power
cable of Inv. Comp. into the current sensor, CTU and CTV
on PCB3. Connect the U phase of the power cable and U
phase of the current sensor as a combination, and the V
phase of the power cable and V phase of the current
sensor as a combination respectively. If incorrectly
connected, malfunction or damages will occur.
n Removing PCBs
a. Remove two screws fixing the electrical box cover and
remove the electrical box cover.
b. Disconnect the connector connected to the PCB and clamp
the middle portion of the holder by pinchers and pull it out.
Pull the PCB by applying a force by finger to the portion
near the holder of the PCB from the rear side.
c. Replacing Inverter PCB (PCB3)
After removing four (4) M3 screws and remove bushes and
collars from the PCB. When remounting, firmly mount the
bushes and collars.
RAS-5FSG, 5FS3,
RAS-8FSG, 8FS3,
RAS-10FSG, 10FS3
4. Do not clamp electrical wires between a mounting electric
component and plates or electric parts when a PCB is
remounted.
5. Screws, bushes and collars are used to fix the inverter
PCB. Check to ensure that the bushes and collars are used
when fixing the inverter PCB again. If not used, it may
cause malfunction.
6. In the case that the control PCB is replaced, set all the dip
switch at the same position as the original ones were. If not
set, malfunction may occur.
7. Do not apply a strong force to electric components and
PCBs to avoid damages.
Screw
Screw
2
SERVICING
11
RAS-16FSG, 16FS3
RAS-20FSG, 20FS3
Middle Part of Holder
PCB
Collar
PCB
Bush