Subordinate Control Loop - JUMO 709061/8-01-032 Operating Manual

5 Configuration
Subordinate control
loop
58
Value / settings
2 2
U , U, I , I, P
Switched off
k
/ bold = default setting
V1.04/EN/00561071 [Thyristor Power Switch TYA 201]
Description
Note:
The subordinate control loop only appears for:
r
Power controller
Thyristor control
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:
2
U is used for:
- Positive temperature coefficient, molybdenum disilicide
≈
R is constant
- If
- Brightness controls.
2
I 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
The diagram shows how the phase angle is specified via a
standard signal without a subordinate control loop.
Phase angle α
r
Continuous (power
0 to 20 mA
Analog input
0 to 10 V