ABB UNITROL 1020 - Digital Outputs

 Chapter 3 - Device Overview
UNITROL 1020 User Manual 3BHS335648 E82 27
24 V DC
normal
DIO1 to 8
DI9 to 12
DI13 to 18
24 V DC
inverted
DIO1 to 8
DI9 to 12
DI13 to 18
3.3.5.2 Forcing Digital Input Signals
Each digital input signal can be set to a predefined value (i.e. active/not active) by means
of configuration, without the need to make connections at the device's terminals; this
process is also known as forcing.
Forcing a digital input terminal can be done by configuring the Polarity parameter of an
input to Normal or Inverted. When Polarity is set to Normal, the digital input is set to not
active, i.e. false or logical 0. When it is set to Inverted, the input is set to active, i.e. true
or logical 1. The digital input which is being configured, must not be wired at the device
terminals. For more information about configuration see Chapter 6 - Operation.
3.3.6 Digital Outputs
Output Function
Description
None
Output not assigned
Boost
Status signal boost is active
Boost supports excitation in the event of line short circuit or heavy load.
The boost function is blocked during field flashing and Soft start.
Field Flashing
See section 3.4.2.2
Field flashing (voltage build up) active, if Excitation ON.
The next field flashing can only be started after Excitation ON or after
the power has been switched off.
During field flashing the output of the regulator is blocked in all
operation modes.
System OK
Reserved signal, do not use
Limit Active
One of the limiters (V/Hz, Ie, PQ, UM or Im) is active
or setpoint limit has been reached (min. or max. position)
V/Hz Limit Active
V/Hz limiter active
SP Limit Reached
Setpoint limit has been reached
SP Minimum Reached
Minimum setpoint has been reached
SP Maximum
Reached
Maximum setpoint has been reached
Operational Limit
Active
Ie, PQ, UM, Im limiter or Diode Alarm active
Min Ie Active
Ie minimum current limiter active
Max Ie Active
Ie maximum current limiter active
Min PQ Active
PQ limiter active
Min UM Active
Limit value for minimum machine voltage is under-run,
voltage limiter active
Max UM Active
Limit value for maximum machine voltage is exceeded,
voltage limiter active
Voltage Relay
Active = machine voltage below boost threshold
Inactive = boost threshold plus hysteresis exceeded
Not dependent on signal Excitation ON.
Close CB Command
The command is released: