Service manual

Always On UPS Systems Inc

1. SAFETY INSTRUCTIONS

This Safety Notice is addressed to the Always “On” customer engineers who perform

maintenance of the Uninterruptible Power Supply (UPS) systems.

Electrical Safety

• Maintenance work to be preformed by factory trained customer engineers or qualified

personnel. Extremely dangerous voltage levels can exist within the UPS system; extreme

caution must be used.

• Ensure system is in maintenance bypass mode or external wrap-around bypass mode

before work is started.

• This manual is designed as an aid tool in diagnosing problems that may arise. Always

“On” does not assume responsibility if information causes injuries.

• Apart from the front door, do not open any other part of the UPS without consulting the

factory first. Before removing the protection screens, be sure that the unit is completely

powered off.

• Be aware that dangerous voltage can be supplied by the internal battery or electrolytic

capacitors.

• When system is in bypass mode and all fuses have been opened, dangerous voltages may

exist within the UPS system. Use extreme caution when exchanging boards and working

inside the unit.