Electronic Systems Support EFC52 SERIES, Installation, Operation And Maintenance Manual, Page: 10 / 32

MNL-000700
Rev B
www.ess.to
January 2017 8
8.
SYSTEM MAINTENANCE
CAUTION!
PLEASE READ ALL SAFETY PRECAUTIONS BEFORE PROCEEDING
8.1 Blown Fuse Replacement
If a fuse has blown in the system, contact an authorized factory technician to replace it.
CAUTION! Fire Hazard Warning:
Replace only with same type and rating of fuses supplied with the system.
8.2 Battery Replacement Steps
Servicing of batteries should be performed or supervised by personnel knowledgeable about batteries
and the required precautions. When replacing batteries, replace with the same type and number of
batteries.
CAUTION!
Do not dispose of batteries in a fire. The batteries may explode.
Do not open or mutilate batteries. Released electrolyte is harmful to the skin and eyes.
It may be toxic.
A battery can present a risk of electrical shock and high short-circuit current. The following precautions
should be observed when working on batteries:
•
Remove jewelry, rings, watches or other metal objects.
•
Use tools with insulated handles.
•
Wear rubber gloves and boots. Wear safety glasses.
•
Do not lay tools or metal parts on top of batteries.
•
Disconnect charging source prior to connecting or disconnecting battery terminals.
•
Determine if the battery is inadvertently grounded. Remove string from buss and check voltages to
ground. Contact with any part of a grounded battery can result in electrical shock. The likelihood of
such shock can be reduced if such grounds are removed during installation and maintenance
(applicable to equipment and remote battery supplies not having a grounded supply circuit).
1. Prepare the new battery for installation. Check to make sure the battery is the same type and amp-
hour rating. Use a non-metallic brush or scotch brite pad to clean the terminals. Apply a light coat of
No-ox grease to the terminal to avoid corrosion "per battery manufacturer's recommendation".
2. Disconnect the charger or UPS from the battery string by opening the breaker.
3. Remove the center jumper on the battery string to reduce the voltage. If replacing all batteries,
continue reducing the voltage in this manner.
4. Disconnect the interconnect bus bars and/or cables from the battery to be replaced.
5. Remove the old battery.
6. Install the new battery. Make sure the new battery is installed the same way regarding polarity
orientation and verify with drawing.