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User Manual
1.5 Manual Bypass Switch Operation
Manual Bypass switch is used only when a fault occurs in the Network Power Switch and the control circuitry of
the Network Power Switch is to be checked. To perform this operation the load is connected to the bypass. For
Normal Operation, the position of the switch should be at Network Power Switch output position (i.e. horizontal)
If the load is to be fed through the source 1 Bypass, first it is to be unlocked and the knob should be rotated
upwards. To feed through source 2 bypass the knob is to be rotated downward.
A mechanical interlocking arrangement is provided on this Bypass switch, by which the Hot swappable unit can be
removed only when load is connected to bypass. In normal operation when the load is connected to Network Power
Switch, the Hot swappable unit cannot be removed.
Operating Network Power Switch in Bypass mode
Unlock the Manual Bypass Switch with the key provided.
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Depending upon the available healthy source (i.e. either Source-1 or Source-2 ) select it by changing the
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Manual Bypass Switch position. Because of the make-before-break operations of the switch it is necessary
to select the bypass line on the source, which was feeding the output of the NPS previously, otherwise the
unsynchronized sources will be shorted resulting in fuse(s) blow.
Unlock the sliding module
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(08/10)
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Load feed through source 1 BYPASS
Load feed through NPS OUTPUT
Load feed through source 2 BYPASS
Fig 1.5 – Manual Bypass Switch Operation
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Chapter 1 - General Description
Page 1-4
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