Product Manual

5. Transfer Switch Service 3-2016
50 A046S594 (Issue 12)Copyright © 2016 Cummins Inc.
FIGURE 24. INTERIOR COMPONENTS FOR RA 400A SERVICE ENTRANCE MODELS
5.4 Limit Switch Replacement Procedure
WARNING
The transfer switch presents a shock hazard that can cause severe personal injury or death.
Before beginning installation, remove all sources of AC power. If a generator provides
emergency power, move the generator operation selector switch to Stop, disconnect AC line
power, disconnect the battery charger from its AC power source, and disconnect the starting
battery (negative [-] lead first).
1. Remove all sources of power from the transfer switch in the following order.
a. Move the operation selector switch on the generator to Stop (Off).
CAUTION
Always disconnect a battery charger 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.
b. If there is an external battery charger, disconnect the battery charger from its AC power source.
WARNING
Ignition of explosive battery gases can cause severe personal injury. Do not smoke or
cause any spark, arc, or flame while servicing batteries.
WARNING
Accidental starting of the generator can cause severe personal injury or death due to
electrocution or contact with moving parts. Disconnect the starting battery cables,
before performing service. Batteries emit hydrogen, a highly explosive gas.
Thoroughly ventilate the battery compartment before removing battery cables. Remove
the negative (-) cable (s) first to reduce the risk of arcing.
c. Disconnect the generator starting battery (negative [-] lead first).
WARNING
If the cabinet must be opened for any reason, remove AC power to the automatic
transfer switch. If the instructions require otherwise, use extreme caution due to the
danger of shock hazard.
d. Remove AC power to the automatic transfer switch.
2. Remove the transfer switch cabinet door panel.
3. Mark and disconnect all wires connected to the limit switches; see Figure 26.
4. Remove the faulty limit switch.
5. Install the new limit switches. Use the manual operation handle; see Figure 28 to rotate the shaft so
that the limit switches are installed as shown in Figure 26.