User`s manual

Eternalight 1 Online Emergency Lighting Inverter User’s Manual

#018-0135-01 Rev C

1.6.D.

External Maintenance Bypass (EMB)

Operation (Optional)

There is an optional External Maintenance Bypass which supplies the critical load with unconditioned

input power . The purpose of this option is to route power to the critical load while the UPS’ rectifier and

inverter are de-energized, and during Start-up before the system is fully

operational

(refer to Figure 4)

With the

External Maintenance Bypass

there is a hard wired bypass that can be operated after the Static

Bypass Switch has been operated, making it possible to isolate the entire UPS for service and mainte-

nance. The internal control system determines the operation of the normal and External Maintenance

Bypass paths, with the load powered from the inverter being the normal operation.

Figure 4 Single Line Drawings –External Maintenance Bypass Operation