7100A User Manual
4-5
Control / Limits
Current limit by threshold.
If I
RMS
> I
max
:
firing angle variation.
V2 control in ‘Burst mode 16’
Current limit by threshold.
If I
RMS
> I
max
:
firing angle variation.
P control in ‘Burst mode 16’
Power limit by
control in ‘Burst mode 16’
taking P
max
into account
Current limit by transfer.
If I
RMS
2
(%) > V
2
(%):
automatic transfer to I
2
control by firing
angle variation.
Current limit by transfer.
If I
RMS
2
(%) > V
2
(%):
automatic transfer to I
2
control by firing
angle variation.
Power limit by control (variation of
firing angle; new ratio between P and
setpoint.
I
2
Control
Firing
Control
Potentiometer
Operation
mode
type
Name
Action
of limit
C16
V2CL
VICL
PA
V2CL
VICL
I
2
I lim
Thyristor unit
current recalibration:
set threshold
I
max
I lim
Thyristor unit
current recalibration:
set threshold
I
max
VI lim Recalibration of
power control loop:
set ratio between
P and setpoint
I lim
Thyristor unit
current recalibration:
set ratio between
I (%) and setpoint
I lim
Thyristor unit
current recalibration:
set ratio between
I (%) and setpoint
VI lim Recalibration of
power control loop:
set ratio between
P and setpoint
I lim
Thyristor unit
current recalibration:
set ratio between
I (%) and setpoint
Table 4-2 Operation of current and power limits
4.3. CURRENT AND POWER LIMIT SPECIFICATIONS
The table below summarises the operation of the limits used in the 7100A series power thyristor units.
Reminder
: Recalibration sets the unit’s new nominal current rating (I
N
).
