2011-07-01/00561073 [SCR Power Controller TYA202] 49
5 Configuration
Cascade control U
2
, U, I
2
, I , P Note: Cascade control only appears when:
SCR control
➔ Continuous (controller).
Cascade control loops are used to eliminate or compensate
for external interference, such as fluctuations in the supply
voltage and changes in resistance which would have a nega-
tive effect on the control loop.
The setting U is used when the load voltage is to be directly
proportional to the default set point value.
The setting I is used when the load current is to be directly lin-
ear in relation to the default set point value.
If the temperature behavior of the heating elements is not lin-
ear or the heating elements are subject to aging, the following
cascade controls are advantageous:
U
2
is used for:
- positive temperature coefficient, molybdenum disilicide
- if
R » is constant
- brightness control.
I
2
is used for:
- negative temperature coefficient (TC)
P is used for:
- temperature-dependent TC
- 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 cascade control.
Value/settings Description
k/ bold = factory setting
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