Siemens D7-SYS - Page 477

Closed-loop thyristor current control
System- and communication configuring D7-SYS - SIMADYN D 5-37
Edition 06.2002
Pre-control angle
Y
0
WC
current setpoint
Discontinuous
range
Non-
discontinuous
range
VCI
ALP
max.
min.
Fig. 5-20 Characteristic of the current pre-control
The output CPC.Y must go to zero at the discontinuous limit
(PA6.YIT<1), as otherwise the pre-control and the controller would
oppose each other. This could result in current spikes. The value at
CPC.VCI must correspond to the current setpoint at the end of the
discontinuous range.
Significance Value\connection
AD Hardware address
WC Current setpoint (absolute value)
CSP.YCW
→ CPC.WC
VCI
Current setpoint at the discontinuous limit,
normalized to the motor current CAV.ARC
(The discontinuous limit should be determined using PA6.YIT.)
This function is switched-out with the value = 0.
(Default: 0.1)
{0 < VCI <
discontinuous limit}
ALP
Pre-control angle in the discontinuous range [°],
start when the current starts to flow
(Default: 25.0)
{
≥25°…30°≤}
Y Pre-control angle in the discontinuous range [ASG]
CPC.Y
→ CPI.CPC
Table 5-9 I/O CPC
Note
I/O