ABB ACH550-BCR, Руководство пользователя

Страница: 390 / 642

2-44 ACH550 E-Clipse Bypass User’s Manual
Bypass functions overview
Bypass/Drive Mode transfers
If the drive is in the Auto mode and the motor is running in the Drive mode, the motor
will transfer to bypass operation and continue running if the system is switched to the
Bypass mode and the bypass is in the Auto mode with the Start/Stop Input contact
closed. If the motor is running in the Bypass mode, the motor will transfer to drive
operation and continue running if the system is switched to the Drive mode and the
drive is in the Auto mode with the Start/Stop Input contact closed.
Starting the motor on application of power
If the Safety Interlock(s) and Run Enable Input contacts are closed (Start command
must also be present in Auto) and the system is in the Bypass mode and in either the
Hand or Auto mode, the motor will start across the line as soon as power is applied.
If the system is in the Drive mode with the drive in the Auto mode, the motor will start
on the drive as soon as power is applied.
Automatic transfer feature
When the Automatic Transfer feature is selected, the system switches to Bypass
mode and the motor is automatically transferred to line power if the drive trips out on
a protective trip. If automatic restart has been enabled in the drive, the drive will
attempt to automatically restart before the motor is transferred to line power. The
Automatic Transfer function can be enabled through the bypass control panel. The
Automatic Transfer
indication is provided on the bypass control panel. The control
panel display will continuously flash an alarm to indicate the system has
automatically transferred to Bypass. The bypass event log will also record this event.
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
Installation
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 serial communications to the building automation system.
3. “Comms”, in which case the bypass system will react to the defined input function
over serial 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 serial communications to the building automation
system.