Relay Contact Outputs; Safety Interlock; Bypass Fault Reset; System Ready/System Running - ABB ACH550 series User Manual

E-Clipse Bypass Configurations for ACH550 Drives
Start command is present, the Enabled LED will flash green and the motor is
prevented from running.
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
output contactor, bypass contactor, and System Started relay are de-energized
preventing the motor from running.
Bypass Fault Reset (DI4)
The Bypass Fault Reset input can be connected to an external contact that is closed
to reset a bypass fault. It may take several minutes before the bypass can be reset
after an overload trip.
Bypass Override (DI5) (Override 2)
The Bypass Override (Override 2) input can be connected to an external contact that
is closed to select the Bypass Override mode. See "Bypass Override Mode" on
page 36 for a description of this mode.
Smoke Control (DI6) (Override 1)
The Smoke Control (Override 1) input can be connected to an external contact that
is closed to select the Fireman's Override mode. See "Smoke Control Mode" on
page 35 for a description of this mode.

Relay Contact Outputs

System Ready (1) [SYS READY]
If configured for System Ready, the relay is energized when the Drive/Bypass
System is ready to be started. Two conditions must be met in order for the System
Ready relay to energize.
• The Safety Interlock input contact(s) must be closed and
• There can be no fault present in the selected mode (Drive or Bypass) of the
system.
System Running (2) [SYS RUNNING]
If configured for System Running, the relay is energized when the Drive/Bypass
system is running. The System Running relay provides an output when the motor is
running whether powered by the drive or the bypass.
System Started (3) [SYS STARTED]
If configured for System Started, the relay is energized when the Drive/Bypass
system is started. Three conditions must be met in order for the relay to energize.
• A Start command must be present,
• The Safety Interlock input contact(s) must be closed and
Overview of Bypass Functionality
39