Bypass Overview - Eaton 9PXM User Manual

Bypass Overview

The BPM has three operating positions (see Table 1). Consider both the operating state of the UPS and the
BPM when protecting your critical loads.
Failure to understand the correct bypass sequence and position may cause the critical load to be
dropped.
The BPM consists of a load position handle and a red button (see Figure 21).
LOTO Bar (red)
Interlock Button (red)
Figure 21. Bypass Switch Positions
The red button:
Sends an electrical signal to the UPS to switch to the internal Bypass mode (if it is not already operating in
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that mode).
Operates a mechanical interlock, to prevent the switch from being turned without first signaling the UPS.
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You must press the red button before you can turn the load position handle.
When the red button is pressed, the UPS front panel displays "Manual Bypass. " To move the MBP switch
handle from one position to another, the red button must be pressed WHILE the handle is being rotated.
Otherwise, the switch will be damaged.
NOTE 1 If the UPS remains in Manual Bypass mode and incoming AC power is lost, the load
is automatically dropped. The UPS must be in Normal mode to provide battery
backup power.
NOTE 2 In the UPS or LINE position, AC input power is still connected to the input terminals
inside the UPS.
NOTE 3 If you have any questions or problems with the bypass operation, call the Help Desk
(see Chapter 11, "Service and Support" on page 94).
Bypass switch
handle
UPS with Bypass Electrical Installation
CAUTION
Eaton 9PXM UPS (4-20 kVA) User's Guide P-164000669—Rev 05 25