Product Manual

Table Of Contents

5. Transfer Switch Service 7-2019

WARNING

Accidental starting of the generator set 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 set 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.

e. Remove AC power from any accessories, such as a battery heater, oil heater, etc.

2. Remove the transfer switch cabinet door panel.

3. Remove the relay from the relay base.

4. Install the new relay into the relay base.

5. Restore power.

5.4 Utility Sense Relay (K2) 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 set provides

emergency power, press the generator set stop button, disconnect AC line power, disconnect the

battery charger from its AC power source, and disconnect the starting battery (negative [-] lead

first).

1. Press the stop button on the generator set.

a. Press the stop button on the local generator set control.

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.