Energy Tech Laboratories EDP70 - Manual (Page 42)

page 42 -- MI00/10056 rev.1--05/2001
8.0 MAINTENANCE BYPASS
The EDP70 PLUS UPS is equipped with Manual Maintenance Bypass systems. If a unit requires servicing, the
Manual Maintenance Bypass allows the load to be connected directly to the AC supply so that the unit may be
serviced in safety. The following instructions must be followed:
1. Ensure that ‘SYSTEM NORMAL’ is displayed on the LCD. (Note: If ‘SYSTEM NORMAL’ is not
displayed check that the inverter is not ‘OUT OF SYNC’, see section 10.7. Turning the inverter off
under this fault condition will interrupt the load supply.)
2. Turn off the inverter by pressing the inverter shutdown button for more than 2 seconds
3. Turn the Maintenance Bypass Switch (located behind front panel, see figure 14, 17 or 20) to ON.
4. Turn off the Primary Input, Reserve Input and UPS Output Switches, see figure 14, 17 or 20.
THE LOAD IS NOW SUPPLIED DIRECTLY FROM THE AC UTILITY SUPPLY AND IS NO LONGER
PROTECTED BY THE UPS
CAUTION: Some components in the UPS will retain a static voltage even after the switches have been
opened. Also, on the 50/80kVA ratings, the isolating transformer and the relative cooling
fans are still supplied from the Bypass.
To return to the normal operating mode, follow the above procedure in reverse.
Note: The EDP70 PLUS UPS must not be left operating with the Maintenance Bypass Switch in the ON
position.
9.0 SHUT-DOWN
1. Close down the load in an orderly manner.
2. Push the (inverter shutdown) button for more than 2 seconds.
3. Turn the main switch to OFF.
Note: If the electricity supply to the site is switched off outside normal working hours, the EDP70 PLUS should
be shut down each evening, by either using the shutdown procedure or wiring in the Emergency
Power Off (EPO) function, see figures 14, 17, 19 or 22 (depending on the UPS size).
This will prevent the battery from discharging.
If, on the other hand, the supply to the site is continuous, the EDP70 PLUS should be operated 24
hours a day.
9.1 Installing the EPO
To wire the EPO, open the link between terminal boards 1 and 2 and connect a signal switch: when the switch is
enabled, the inverter and rectifier will stop, the battery relay will be opened and the load will be de-energized