ACH580 E-Clipse bypass and packaged drive user manual 43
E-Clipse bypass functions overview
Bypass control board inputs and outputs
The bypass control board has five programmable and one fixed relay contact
(digital) inputs and five programmable relay outputs that are available for connection
to external control circuits. The internal 24VDC supply is normally used in
conjunction with the relay contact inputs. The input and output functions are
described below. Refer to the Installation section on page 3 for additional information
and connection instructions.
Relay contact (digital) inputs
All Relay Contact (Digital) Inputs with the exception of the Override 1 “Smoke
Control” and “Reverse Drive” Inputs can be configured to any one of three (3)
conditions.
1. “Digital Input” (DI), in which case the bypass system will react to the defined input
function during normal operation.
2. “Not Selected”, in which case the bypass system will ignore the defined input
function as bypass control, but will continue to pass the operating state of the digital
input through communications to the building automation system.
3. “Comms”, in which case the bypass system will react to the defined input function
over communications during normal operation. The bypass system will ignore the
digital input as a defined input function, but will continue to pass the operating state
of the digital input over communications to the building automation system.
Start/Stop (DI1)
The Start/Stop input is connected to a normally open contact that starts and stops
the system. When the bypass is in the Drive mode and the drive is in the Auto mode,
the Start/Stop input contact controls the motor by starting and stopping the drive.
When the bypass is in the Bypass mode and Auto is indicated on the bypass control
display, the Start/Stop input contact controls the motor by controlling the bypass
contactor.
Permissive (DI2)
The Run Permissive input is connected to the series combination of any external
normally closed permissive contacts, such as damper end switches, that must be
closed to allow the motor to run. If any of these external contacts are open while a
Start command is present, the Enabled LED will flash green and the motor is
prevented from running.
Reverse Drive (DI2)
The Reverse Drive input can be connected to an external contact that is closed to
select the Reverse Drive mode. See Reverse Drive Mode on page 35 for a
description of this mode.
Safety Interlock (DI2…DI5)
The Safety Interlock input(s) are connected to the series combination of any external
normally closed interlock contacts, such as Firestat, Freezestat, and high static
pressure switches – switches that must be closed to allow the motor to run. If any of
these external contacts are open, the Enabled LED is illuminated red, the drive
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