5-3
Copyright 2017 Cummins Inc.
Circuit Board Removal Safety Precautions
To prevent circuit board damage due to electrostatic
discharge (ESD), a grounding wrist strap must be
worn when handling circuit boards or socket-
mounted IC’s. (The wrist strap does not provide a
direct short to ground, but is typically rated at
approximately 1 megohm to ground.)
Attach the clip to a non -painted surface of the con-
trol box and place the strap around your wrist before
handling a circuit board.
CAUTION
Electrostatic discharge will damage
circuit boards. Always wear a grounding wrist
strap when handling circuit boards or socket-
mounted IC’s.
Turn off or remove AC power from the battery char-
ger and then remove the negative (−) battery cable
from the set starting battery. This is to make sure
that the set will not start while working on it and to
avoid circuit board damage, caused by voltage
spikes when removing and replacing circuit board
connectors.
CAUTION
Always disconnect a battery char-
ger from its AC source before disconnecting the
battery cables. Otherwise, disconnecting the
cables can result in voltage spikes high enough
to damage the DC control circuits of the set.
WARNING
Accidental starting of the generator
set while working on it can cause severe per-
sonal injury or death. Prevent accidental start-
ing by disconnecting the starting battery cables
(negative [−] first).
Make certain battery area has been well-venti-
lated before servicing battery. Arcing can ignite
explosive hydrogen gas given off by batteries,
causing severe personal injury. Arcing can oc-
cur when cable is removed or re-attached, or
when negative (−) battery cable is connected
and a tool used to connect or disconnect posi-
tive (+) battery cable touches frame or other
grounded metal part of the set. Always remove
negative (−) cable first, and reconnect it last.
Make certain hydrogen from battery, engine
fuel, and other explosive fumes are fully dissi-
pated. This is especially important if battery has
been connected to battery charger.
GROUND LEAD CLIP
WRIST STRAP
NON-PAINTED
SURFACE
FIGURE 5-2. WRIST STRAP
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