ABB UNITROL 1020 - Work Carried out While Machine Is at Standstill; Work Carried out While Machine Is Running; Load Tests (Nominal Speed, Not Synchronized); Tests under Load

 Chapter 5 - Commissioning
UNITROL 1020 User Manual 3BHS335648 E82 93
5.4 Work carried out while Machine is at Standstill
Preliminary Checks
 Wiring check, compare connections with schematics.
CAUTION!
Check the insulation strength of the plant with the insulation tester
During the test, the equipment could be damaged by the testing voltage.
Disconnect cables to the UNITROL 1020
 Switch on auxiliary voltage UAUX
 Adjust parameters
 Check measuring voltage and current transformer circuits
 Measure field resistance
 Checking input and output signals
 Low-load test: External power electronics supply (3x <300 V ac)
- Open loop mode
- Optimize regulator Ie
 Adjust limiter settings based on the customer’s power chart
5.5 Work carried out while Machine is running
5.5.1 No-load Tests (nominal speed, not synchronized)
 Field flashing and discharge in Auto and Manual mode
 Soft start in Auto mode
 Adapt setpoint range, optimize voltage regulator
 V/Hz limiter: The actuation point fknee is set to 48 Hz by default
For 60 Hz machines the fknee should be set at approximately 58 Hz.
5.5.2 Tests under Load
 Stator current measurement, internal P- and Q-measurement, droop/compensation.
The droop/compensation is set to 0% by default. If the machine is paralleled directly
with the rigid grid or, via a busbar, with other synchronous machines, it is essential that
the droop Kq is set to a value of approx. -10% before the first synchronization. The
reactive current must be monitored carefully during the first paralleling. If it increases
uncontrollably following the first synchronization, then the current polarity of the IM2
measurement is incorrect or the CT phase position is wrong.
 Load rejection overexcited and underexcited