GE Industrial Solutions AF-650 GP Drive Panel - Manual (Page 11)

11
In the “Test” position AC input power to the drive will be applied and the inverter
will run at the speed set in using the Hand/Off/Auto functionality. However, the
“Test” position disables drive output contactor’s operation and 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.
Drive/Off/Bypass Selector
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.
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 transfer to bypass, 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.
DEH40652
– Page 4 AN 11-2021 Rev 06, 12/16/2011
CAUTION: Please see the instructio ns 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.
WARNING: Although input power is removed from the drive in the
“Isolate” position this does not guarantee that dangerous voltage levels
are absent. The AF 650 GP drives contain capacitors, which can
maintain dangerous voltage levels for an extended period following
removal of AC input power. Details of waiting time are given above