ABB UNITROL 1020 - Startup Functions

 Chapter 3 - Device Overview
UNITROL 1020 User Manual 3BHS335648 E82 43
3.4.2 Startup Functions
3.4.2.1 Soft Start and Line Charging
- Starting voltage : Start Level
[%] from Initial Setpoint
- Delay until ramp : Hold Time [s]
- Ramp time : Ramp Time [s]
- Start Frequency Machine Freq. [Hz]
The final value of Soft Start ramp is the Initial
Setpoint for Auto mode. For more information
refer to Chapter 3.4.1.6.2 Setpoint Setting for
the Regulator.
A second set for Line Charging parameters is
also available. Line Charging is enabled by
Digital Input
Start level
Hold time
Ramp
[%]
[s]
Initial Setpoint
(Auto mode)
Gen CB Closed Status = active
Machine voltage
Trigger immediately the soft start
Blocking excitation until UM frequency reaches a predefined level (parameter
name: Start Frequency)
Excitation is switched on (Command via digital input or remote control) when the
machine frequency is higher than the start frequency threshold. The Soft Start time
starts after the internal Excitation ON command. When the machine frequency goes
below 10Hz for longer than 10 sec, excitation is blocked. Excitation is started with Soft
Start when the generator frequency goes above the start frequency again.
Note: Soft Start is available only in Auto mode.
There is no indication if Excitation ON is blocked or not.
In order to measure the correct frequency, the machine voltage must be
above 2%
3.4.2.2 Field Flashing
- Off Level
Off Level [%]
Soft start level
[%]
[s]
Field flashing off level
Excitation ON
Signal field flashing
Machine voltage
Setting the Off Level to 0% disables field
flashing.