36 ACH580 E-Clipse bypass and packaged drive user manual
E-Clipse bypass functions overview
Smoke Control Mode (Override 1)
In the Smoke Control (Override 1) mode, the motor is powered by AC line power
through the bypass contactor. The source of the start command is internal and
unaffected by external stop commands. The system also ignores all commands from
either the drive or bypass control panels, or over communications, when in this
mode. The user can switch to the Smoke Control mode by closing the Smoke
Control input contact (DI6). When the Smoke Control input contact is closed, the
system is forced to bypass and runs the motor (refer to the Note on page 55). The
Motor Run LED flashes green when the system is in Override. While in Smoke
Control mode, the system does not respond to some inputs and does respond to
other inputs, i.e., the system will ignore low priority safeties such as low temp or
FreezeStats and return duct smoke detectors. While in Smoke Control mode, the
system will respond to high priority safeties such as high static pressure and damper
end-switch proofs. The system will always respond to the electronic motor overload
protection included in the bypass controller. See the diagrams on page 56 for
suggested wiring of typical customer inputs.
Normally when the Smoke Control input contact is switched from closed to open, the
system returns to the operating mode that existed prior to entering Override and can
again be controlled using the Drive and Bypass keys. The exception to this is when
the Advanced Override (Override 2) input contact is closed, in which case the
system switches to Advanced Override mode.
Supervisory Mode
In the Bypass Supervisory mode, the bypass has the ability to control a process by
cycling the bypass contactor on and off with a hysteresis control. In this mode the
motor is powered by AC line power through the bypass contactor. 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 analog input level (AI2) on the
ACH580 drive when the Auto mode has been selected or directly from the bypass
control panel when the Hand mode has been selected (manual). Bypass
supervisory control is enabled and configured in parameter Group 32. Once
enabled, the user can switch to the Supervisory 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. The Supervisory control only operates in Bypass / Auto mode. If
the user presses the Hand or Off buttons, operation is the same as normal bypass
operation. If the user selects Drive mode, the Supervisory operation is also stopped.
Returning to Bypass / Auto mode will put the bypass back to Supervisory mode.
Bypass
Supervisory
Controller
Temp
Sensor
AI2
ACH580
Bypass
Contactor
Traditional
Contactor
Control
Drive mode
OR NOT AUTO
OR OVERRIDE
OR 32.01 = 0
Bypass mode
AND AUTO
AND NOT OVERRIDE
AND 32.01 = 1
Transitions subject
to Start Delay and
Stop Delay
Output =
1 if AI2 > Start Level
0 if AI2 < Stop Level
unchanged otherwise
Output =
1 if AI2 > Start Level
0 if AI2 < Stop Level
unchanged otherwise
Parameter
0121
= AI2
Start >=
Stop
Start <
Stop
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