available, the UPS transfers the load to the static bypass switch when the
Battery DCUV Trip Imminent alarm activates.
If the input power becomes available again at any time during the battery
discharge, K1 and K5 close and the UPS returns to normal operation. The UPS
also starts to recharge the batteries to restore the capacity.
3.2.3
Bypass mode
CAUTION
The critical load is not protected while the UPS is in bypass mode.
The UPS automatically switches to the bypass mode if it detects an overload,
load fault, or internal failure. The bypass source supplies the commercial AC
power to the load directly. The UPS can also be commanded to transfer to the
bypass mode manually through the display. The UPS status indicated on the
display is
On Bypass
.
The UPS will return from the bypass mode back to online mode, if the condition
(for example overload) that caused the transfer is cleared. If there is a condition
that will not clear by itself (for example UPS internal failure), the UPS will remain
on bypass operation.
Figure
shows the path of electrical power through the UPS system when
operating in the bypass mode.
Eaton 91PS/93PS UPS 8–40 kW
User's and installation guide
©
Eaton Corporation plc 2018. All rights reserved.
Revision: 005
Document ID: P-164000493
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