ACH580 E-Clipse bypass and packaged drive user manual 35
E-Clipse bypass functions overview
E-Clipse bypass functions overview
Operating modes
Note: For normal operation with the bypass, place the drive control panel in the Auto
mode. Place the E-Clipse bypass control panel to Drive (selected) and ensure the
Hand-off auto selection is set to OFF.
Drive Mode
Under normal conditions the system is in the Drive mode. The drive provides power
to the motor and controls its speed. The source of the drive’s start/stop and speed
commands is determined by the Auto or Hand mode selection of the drive’s control
panel. Commands come from the bypass control terminals (or communication) when
the Auto mode has been selected or directly from the drive control panel when the
Hand mode has been selected. The user can normally switch to the Drive mode by
pressing the Drive key on the bypass control panel.
Reverse Drive Mode
Reverse Drive mode is a subset of Drive mode; as such the drive provides power to
the motor and controls its speed and direction. The source of the drive’s start/stop,
speed and direction commands is the Reverse Drive input (DI2 - if programmed).
In this mode the system acknowledges all of the same permissives and interlocks as
Drive mode. When the Reverse Drive input contact is closed with the drive running,
the drive ramps down to zero speed then reverses motor direction and continues
running; with the drive stopped, the drive starts and runs in the reverse direction. In
either case the motor operates at the constant speed programmed on the drive. No
other start command is required. See parameter 1630 on page 66 for a description of
drive programming and wiring requirements.
Bypass Mode
In the Bypass mode, the motor is powered by AC line power through the bypass
contactor. The drive contactor opens to isolate the drive output. The source of the
bypass start/stop commands is determined by the Auto or Hand mode selection of
the bypass’ control panel. Commands come from the bypass control terminals (or
communication) when the Auto mode has been selected or directly from the bypass
control panel when the Hand mode has been selected. The user can normally switch
to the Bypass mode by pressing the Bypass key on the bypass control panel.
Alternative methods of bypass control called Overrides are also available. Refer to
the following descriptions of the Override modes.
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