GE Industrial Solutions Digital Energy GT Series UPS 5_6_8_10 kVA - Manual (Page 26)

4.3.3 Maintenance Bypass
It’s possible to bypass the unit for maintenance purpose (with Optional Distribution Unit for 5/6 kVA
models, standard for 8/10 kVA models, section 3.3.8). In case of necessity, please proceed with the
following steps:
1. Switch the unit on bypass, for 5/6 kVA
models by pressing keypad “UPS Off” on
the front panel (see section 4.1) for 1
second and for 8/10 kVA models by
removing the bypass protection cover
(fig. 4.3.3.b).
2. Switch the Maintenance Bypass Switch to
“Bypass” position (fig. 4.3.3 a / 4.3.3.b). For
8/10 kVA models remove the bypass lock
plate before switching to “Bypass”.
3. Switch the unit off, by pressing keypad
“UPS Off” on the front panel
(see section 4.1) for 1 second.
4. Open the Output circuit breaker
(see section 3.3.8).
5. Open the Input circuit breaker
(see section 3.3.8).
6. The unit is now operating in “External
Bypass mode” and maintenance can be
done.
fig. 4.3.3.a
fig. 4.3.3.b
5/6 kVA
8/10 kVA
NOTE
After the UPS is shutdown or in “External Bypass” condition, the residual DC voltage in
the unit will be eliminated within 5 minutes.
Once the maintenance is executed, recover normal conditions with the following steps:
1. Close the Input circuit breaker
(see section 4.2.1 / 4.2.2).
2. Wait 45 seconds to allow the output
voltage to stabilize.
3. Press keypad “UPS on” for 1 second
(see section 4.1). Within few seconds
“operation” LED will be illuminated and
“bypass” LED will be extinguished.
4. Switch the unit to bypass, by pressing
keypad “UPS Off” on the front panel
(see section 4.1) for 1 second.
5. Close the Output circuit breaker
(see section 4.2.1 / 4.2.2).
6. Switch the Maintenance Bypass Switch to
“UPS” position (fig. 4.3.3.c / 4.3.3.d). For
8/10 kVA models screw the bypass lock
plate (fig. 4.3.3.d).
7. Press keypad “UPS On” (see section 4.1) for
1 second.
fig. 4.3.3.c
fig. 4.3.3.d
5/6 kVA
8/10 kVA
Now the UPS protects the load again.
modifications reserved 26 User manual GT Series 5/6/8/10 kVA UPS 1.0 (US)