30 4–20kVA Users Guide P-164000669 4–20kVA Users Guide P-164000669—Rev 09
33..66 BByyppaassss OOvveerrvviieeww
The BPM has three operating positions (see Table 3 ). Consider both the operating state of the UPS and the
BPM when protecting your critical loads.
CAUTION
Failure to understand the correct bypass sequence and position may cause the critical load to be dropped. Do
not operate the bypsass switch if the UPS is in battery mode. Damage to the power modules or the bypass
switch can occur.
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 , “11.2 Service and Support ” ).
The BPM consists of a load position handle and a red button (see Figure 26 ).
Figure 26. Bypass Switch Positions
LOTO Bar (red)
Interlock Button (red)
Bypass switch
handle
The red button:
• Sends an electrical signal to the UPS to switch to the internal Bypass mode (if it is not already operating in
that mode).
• Operates a mechanical interlock, to prevent the switch from being turned without first signaling the UPS.
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.
The bypass switch has three positions as described in Table 3 .
Bypass Overview
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