How to Operate a Wall-Mounted UPS Bypass Switch
The bypass switch for a typical rackmount UPS system should not be operated while the UPS is in 'Battery Mode'. Under normal conditions, the INPUT and OUTPUT breakers on the external bypass should remain closed to allow normal load operation through the UPS. If LED 'A' is flashing red/green or solid green, consult a UPS supplier before proceeding. The procedure involves holding the Red 'O' button for 5 seconds, which will change the status of LEDs 'C', 'E', and 'F'. Following this, the external bypass switch must be accessed, and the key used to ensure the red light on the Bypass switch turns on before the maintenance bypass switch can be operated. It is crucial to follow these steps precisely to avoid any interruptions or damage to the UPS, and this process should only be performed with an engineer present.
Bypass switch must not to be operated if the UPS is in ‘Battery Mode’! Under normal conditions, the INPUT and OUTPUT breakers on the external bypass should be closed. This enables the load to be operated through the UPS.
First call your UPS supplier and speak with an engineer before continuing
– Procedure only if LED ‘A’ is flashing red/green or solid green.
– Hold down the Red ‘O’ button for 5 seconds.
– LED’s ‘C’ and ‘E’ should turn red and LED ‘F’ yellow.
– Open the External Wall mounted Bypass switch door.
– Insert the key into the interlock at the side of the bypass breaker.
– Turn Key, the red light on the Bypass switch should go red.
– Finally, after the light is red, operate the Maintenance Bypass Switch on this panel.
– Most UPS manufacturers will not accept responsibility for interruption or damage of critical load through incorrect use of the bypass switch.
WARNING!
IF THE ABOVE PROCEDURE IS NOT FOLLOWED EXACTLY- THE LOAD ON THE OUTPUT OF THE UPS MAY BE INTERRUPTED CAUSING THE UPS DAMAGE.
All the above is a guide only and should be carried out ONLY in conjunction with an engineer present or under the direction of a UPS engineer.
