Closed-loop thyristor current control
5-56
System- and communication configuring D7-SYS - SIMADYN D
Edition 06.2002
5.3.4 Voltage sensing calibration
The following commissioning steps may only be carried-out when the
system is stationary and the closed-loop control is disabled.
Calibrating the V/f converter frequency for the actual value sensing of the
output voltage.
The closed-loop current control remains switched-out
→
SOL.ION=0 or SOL.IOF=1
•
The offset frequency [kHz] should be read at EMF.YFO = calibration
value for EMF.XFO.
•
The calibration value should be entered with the inverse polarity at
EMF.XFO =
-
EMF.YFO.
•
The value becomes effective (Initialization mode) after a restart.
The output EMF.YUA must have a value which is approximately zero.
5.3.5 Determining the offset angle
The offset angle should be determined if there is a clockwise rotating field
at the electronics and power supply for the Sitor converter.
The offset angle to be specified corrects the phase shift between the
natural firing instant of semiconductor device 1 and the zero crossover of
the filtered synchronizing voltage on the ITDC.
•
The power to the drive converter should be disconnected.
Open the armature circuit (!).
•
Connect the phase voltage L1 (!) from the power connection AK1 of
the SITOR set to channel 1 of the oscilloscope via the 1:100 probe
Summed pulses at channel 2 (ITDC -X5:12)
Connect the oscilloscope ground to the SIMADYN D ground
(only use the ground from ITDC -X5: 14!)
•
Enter firing angle PC6.AQL=150 [
°
],
(this is normally set with the default value)
•
Before the switch-on command, changeover to controlled test
operation with SOL.ISE = 1
•
Power-up the drive converter power supplies
•
Enter a switch-on command from the higher-level control
(SOL.ION=1) and either enter the current setpoint (SOL.WC1/2) >
SOL.WCL > 0.0 or set with the on command for torque direction M1
(SOL.ON1).
•
With a firing angle of 150°, the firing pulse from semiconductor device
1 must coincide with the zero crossover of voltage V
L1-MP
.
If this is not the case, the pulse position must be corrected using
Procedure
Procedure
