Capacitor Discharge System; Necessary Tools - Komatsu 930E-4SE Operation & Maintenance Manual

OM2042 7/11

CAPACITOR DISCHARGE SYSTEM

The control cabinets are equipped with two capacitor
charge lights, one on the exterior of the cabinet and
one in the interior. The capacitor charge lights, when
off, indicate to service personnel that the drive sys-
tem is safe to work on. Certain drive system failures,
however, can result in a condition where one or more
capacitors can remain in a charged state even
though the capacitor charge lights are off.
Because a danger can still exist with the capacitor
charge lights off, it is necessary to adhere to the fol-
lowing instructions before touching or servicing drive
system components. Only authorized service person-
nel are allowed to service the drive system.
Refer to the shop manual for rules when servicing
the drive system. Adhere to the proper procedures
for disabling the drive system.

Necessary Tools

• 2000 VDC meter (Figure 20-2)
(Komatsu p/n PC3186)
(Bierer RCDC 1000 or equivalent)
FIGURE 20-2. VOLT METER (PC3186)
• Personal Protective Equipment (PPE) for working
with 2000 VDC meter
(safety shoes, high voltage gloves, and safety
glasses)
• Multimeter for ground resistance measurement
• Grounding stick pair (Figure 20-3)
(Komatsu p/n PC3299)
(HVR Advanced Power Components MAS-
000039 Ground Stick Pair or equivalent)
FIGURE 20-3. GROUNDING STICKS (PC3299)
Safety - Section 20
Page 20-17