Bypass Run; Bypass Fault; Bypass No Fault; Bypass Alarm - ABB ACH550 series User Manual

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• There can be no fault present in the system. The Start command can come from
the bypass control board terminal block, the drive control panel, the bypass
control panel, or serial communications, depending on the operational mode
selected.
• The System Started relay is ideal for use in damper actuator circuits, opening the
dampers only under those conditions where the system is preparing to run the
motor. Closing the dampers if the safeties open, the system faults, or when a Stop
command is issued.
Bypass Selected (4) [BYPASS MODE]
If configured for Bypass Selected, the relay is energized when Bypass Mode has
been selected as the method of motor control. The Bypass Selected relay is de-
energized when Drive Mode has been selected as the method of motor control.
Bypass Run (5) [BYPASS RUN]
If configured for Bypass Run, the relay is energized when the bypass is running. The
Bypass Run relay provides an output only when the motor is running and powered
by the bypass. The Bypass Run relay is de-energized when the motor is not being
run in bypass.
Bypass Fault (6) [BYPASS FLT]
If configured for Bypass Fault, the relay is energized when a bypass fault has
occurred or when the bypass motor overload/underload protection has tripped. The
specific nature of the fault is indicated on the bypass control panel display. The
Bypass Fault relay is de-energized during normal operation.
Bypass No Fault (7) [BYP NOT FLT]
If configured for Bypass No Fault, the relay is energized during normal operation.
The Bypass No Fault relay is de-energized when power is removed from the system,
a bypass fault has occurred or when the bypass motor overload/underload
protection has tripped. The specific nature of the fault is indicated on the bypass
control panel display.
Bypass Alarm (8) [BYPASS ALRM]
If configured for Bypass Alarm, the relay is energized when a bypass alarm is
present. The specific nature of the alarm is indicated on the bypass control panel
display. The Bypass Alarm relay is de-energized during normal operation.
Drive Fault (9) [DRIVE FAULT]
If configured for Drive Fault, the relay is energized when a drive fault has occurred.
The specific nature of the fault is indicated on the drive control panel display. The
Drive Fault relay is de-energized during normal control panel.
Drive No Fault (10) [DRV NOT FLT]
If configured for Drive No Fault, the relay is energized during normal operation. The
Drive No Fault relay is de-energized when power is removed from the system, or
when a drive fault has occurred. The specific nature of the fault is indicated on the
drive control panel display.
Overview of Bypass Functionality
E-Clipse Bypass Configurations for ACH550 Drives