JUMO 709061/8-01-020, Operating Manual

Page: 60 / 125

5 Configuration
58 V1.04/EN/00561071 [Thyristor Power Switch TYA 201]
Subordinate control
loop U
2
, U, I
2
, I, P Note:
The subordinate control loop only appears for:
Power controller
r
Thyristor control
r
Continuous (power
controller).
Subordinate control loops are used to eliminate or compen-
sate for external disturbances, such as mains voltage fluctua-
tions and changes in load resistance, that would have a
negative effect on the control process.
The U setting is used when the load voltage should be linear
to the setpoint specification.
The I setting is used when the load current should be linear to
the setpoint specification.
The following subordinate control loops have proven advanta-
geous for heating elements that do not have linear tempera-
ture behavior or that are subject to aging:
U
2
is used for:
- Positive temperature coefficient, molybdenum disilicide
- If
R
≈
is constant
- Brightness controls.
I
2
is used for:
- Negative temperature coefficient (TC)
P is used for:
- Temperature-dependent temperature coefficient
- Free-running economy circuit
- General applications
- SIC load with automatic aging compensation
Switched off The diagram shows how the phase angle is specified via a
standard signal without a subordinate control loop.
Value / settings Description
k
/ bold = default setting
Phase angle α
0 t o 2 0 mA
0 t o 1 0 V
Analog inp ut