Drive/Off/Bypass Selector - GE AF-600 FP User Manual
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Drive/Off/Bypass Selector
DEH40602 – Page 4
In the "Test" position AC input power to the drive will be applied and the inverter
will run at the speed dictated by the speed pot with the Hand/Off/Auto (H-O-A)
switch in the "Hand" position. If the H-O-A switch is in the "Auto"
position the inverter will run at the speed dictated by the remote customer
supplied reference signal (0-10 VDC or 4-20 mA). However, power will not be
applied from the inverter to the motor even if the Drive/Off/Bypass selector is in
the "Drive" position. The "Test" setting will also be operational when the
Drive/Off/Bypass switch is in the "Bypass" position allowing the inverter to be
operated without interrupting power to the motor.
In the "Normal" position AC input power to the drive will be applied and the
inverter will operate according to the setting of the H-O-A and Drive/Off/Bypass
switches. Power can be applied from the inverter to the motor only if the
Drive/Off/Bypass selector is in the "Drive" position.
The setting of this selector switch determines whether power to the motor will
be from the adjustable frequency drive ("Drive" position) or directly from the AC
line ("Bypass" position). This selector can be changed "on-the-fly" without first
completely stopping the motor. However, when changing from "Drive" to
"Bypass" mode a short delay is required to be inserted by the operator
(approximately 10 seconds) to allow time for the motor's rotor flux to decay
prior to applying AC line power. If your panel includes the optional "automatic
bypass" functionality the operator can switch directly from "Drive" to "Bypass"
with pausing in the "Off" position. The required time delay is automatically
inserted to allow time for the motor's flux to decay.
CAUTION: Please see the instructions in the "Adjustments" section of this
manual regarding the setting of this time delay. An improper setting could
result in damage to your motor and/or driven equipment.
When changing from "Bypass" to "Drive" mode the drive will utilize the inherent
catch-a-spinning motor feature for a smooth transfer.
If your bypass panel is configured for automatic switchover, then in the event of
a drive fault during "Drive" operation the panel's control logic will automatically
transfer the motor from drive to bypass (i.e.: across-the-line) operation.
NOTE: In the event of a drive fault the motor will continue to operate
in bypass mode as long as the AF 600 FP drive's fault output stays
in the energized state. This means that if the Test/Isolate/Normal
switch is moved to the "Isolate" position that the motor will stop since
removal of drive power will cause the fault output to de-energize.
Therefore, if it is desired to service the drive without interruption of
power to the motor, turn the Drive/Off/Bypass selector to the "Bypass"
position prior to removing power from the drive.
11
AN 11-2021 Rev 05, 12/15/2011
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