Sel 751A - Fuse Replacement; Real-Time Clock Battery Replacement

2.36
SEL-751A Relay Instruction Manual Date Code 20100129
Installation
Field Serviceability
Fuse Replacement
To replace the power supply fuse, perform the following steps:
Step 1. De-energize the relay.
Step 2. Remove the four rear-panel screws and the relay rear panel.
Step 3. Remove the Slot A printed circuit board.
Step 4. Locate the fuse on the board.
Step 5. Remove the fuse from the fuse holder.
Step 6. Replace the fuse with a BUSS S505 3.15A (ceramic),
Schurter T 3.15A H 250V, or equivalent.
Step 7. Insert the printed circuit board into Slot A.
Step 8. Replace the relay rear panel and energize the relay.
Real-Time Clock
Battery Replacement
To replace the real-time clock battery, perform the following steps:
Step 1. De-energize the relay.
Step 2. Remove the four rear-panel screws and the relay rear panel.
Step 3. Remove the Slot B printed circuit board.
Step 4. Locate the battery clip (holder) on the board.
Step 5. Carefully remove the battery from beneath the clip.
Properly dispose of the old battery.
Step 6. Install the new battery with the positive (+) side facing up.
Step 7. Insert the printed circuit board into Slot B.
Step 8. Replace the relay rear panel and energize the relay.
Step 9. Set the relay date and time.
Disconnect or de-energize all
external connections before opening
this device. Contact with hazardous
voltages and currents inside this
device can cause electrical shock
resulting in injury or death.
!
DANGER
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