2.38
SEL-351A Relay Instruction Manual Date Code 20080213
Installation
Circuit Board Connections
Clock Battery
Refer to Figure 2.26 for clock battery location (front of main board). A
lithium battery powers the relay clock (date and time) if the external dc source
is lost or removed. The battery is a 3 V lithium coin cell. At room temperature
(25°C), the battery will nominally operate for 10 years at rated load.
If the dc source is lost or disconnected, the battery powers the clock. When the
relay is powered from an external source, the battery only experiences a low
self-discharge rate. Thus, battery life can extend well beyond the nominal 10
years because the battery rarely has to discharge after the relay is installed.
The battery cannot be recharged.
If the relay does not maintain the date and time after power loss, replace the
battery. Follow the instructions in Accessing the Relay Circuit Boards on
page 2.34 to remove the relay main board.
Remove the battery from beneath the clip and install a new one. The positive
side (+) of the battery faces up. Reassemble the relay as described in
Accessing the Relay Circuit Boards. Set the relay date and time via serial
communications port or front panel (see Section 10: Serial Port
Communications and Commands or Section 11: Front-Panel Interface
(Only on Models With LCD), respectively).
There is danger of explosion if the
battery is incorrectly replaced.
Replace only with Ray-O-Vac
®
no.
BR2335 or equivalent recommended
by manufacturer. Dispose of used
batteries according to the
manufacturer’s instructions.
!
CAUTION
Courtesy of NationalSwitchgear.com
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