JUMO 709062 TYA 202 - Three-Phase Power Controller Operating Manual - Manual (Page 53)

2012-12-31/00561073 [SCR power switch TYA202] 51
5 Configuration
Subordinate control
loop U
2
, U, I
2
, I, P Note:
The subordinate control loop only appears for:
Power controller
r
SCR control
r
Continuous (control-
ler).
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 loop.
The U setting is used when the load voltage should be directly
proportional to the default setpoint value.
The I setting is used when the load current should be directly
proportional to the default setpoint value.
The following subordinate control loops have proven advanta-
geous for heating elements that do not have a linear tempera-
ture behavior or 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 = factory setting
Phase angle α
0 to 20 mA
0 to 10 V
Analog input