DEH40634
AN 11-1018 Rev.02, 09/26/2011
Hand/Off/Auto
Selector
This selector is also referred to as the H-O-A switch. In the “Off” position
power will be removed from the motor in both drive “drive 1” and “drive 2”
modes of operation. It should be noted that this will not cause AC input power
to be removed from the drive. To remove drive input power the Disconnector
switch should be placed in the “OFF” position (or) need to take out fuse link
from FSBLK2 & FSBLK3 after Disconnector is moved to “OFF” position.
In “Hand” mode, power will be applied to the motor from either the drive1 or
drive2 according to the Drive1-Off- Drive2 selector. In this mode the inverter’s
frequency reference is determined by the setting of speed pot on the panel if
ordered.
In “Auto” mode, power will be applied to the motor only when a connection is
made between the two remote run contacts on the customer terminal board
inside the panel enclosure. In this mode the inverter’s frequency reference is
determined by a customer supplied 0-10 VDC or 4-20 mA signal
Hand-Off-Auto on the Drive key pad
All AF 600 redundant drive panels include a keypad for programming and
operation of the drive and includes Hand, Off and Auto operation keys /
buttons. When shipped from the factory, the Hand, Off and Auto buttons are
enabled. Pressing the Off button while the drive is running will cause the drive
to decelerate and shut off regardless of the position of the panel’s selector
switches. To resume normal operations when selector switch is in “Auto” (that
is control the unit from its selector switches and analog signal) press the Auto
Button one time
Keypad “Hand” button should only be use to control Drive Operation when the
selector switch is in “Hand”.
For more details on the Hand, Off, and Auto operation keys, refer to manuals
DET-609
WARNING: Using the Hand operation in the keypad when selector
switch in “Auto” mode may cause control inputs on drive to be ignored
and may result in unintended operations / starting of the drive unit.
CAUTION:
Failure to insert enough time delay between operation of
the motor from the drive1 and operation from drive2 can result in a
protective trip of the drive. The time delay is to ensure a safe transition.
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