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The minimum limiting values should ensure minimum modulation via the control angle (for instance
minimum heating of the load).
CONTROLLER RESPONSE
If the load resistance changes, for instance due to temperature effect, ageing or load fault, then the
values effective on the load change as follows:
2.4 INDICATIONS
2.4.1 LED INDICATIONS
The LEDs on the front side signal the following states:
• ON green: operating indication, power supply controller board
red: RESET active
• CONTROL modulation percentage indication, fl ashing*
• LIMIT limitation is active, relay K2 switches*
• PULSE LOCK Controller Lock active, but load control is continued at pulse limits
(default value = 0)*
• FAULT fault present*
• OVERHEAT overheating of power section
(in case of ..HF types, check ventilator)*
* Default setting
Activation of the integrated semiconductor fuse may be signalled using the fault indicating relay K1
rest current, contactor, otherwise separate supply of the control device required). In case of Power
Controllers from model current 495A, additional signalling is performed via an indicator at the
semiconductor fuse.
2.4.2 RELAY INDICATIONS K1-K2-K3
The Thyro-P Power Controller is fi tted with three relays. Each of these relays has a change over
contact in principle be allocated a value in the event register. The following table shows the contac-
tor allocation of the relays at the corresponding terminal strips. Presets of parameters by the works
(default values) may be found in chapter 3.4.
UNDERLYING LOAD RESISTANCE LOAD RESISTANCE EFFECTIVE*
DECREASES INCREASES LIMITATIONS
CONTROL LIMIT P U
LOAD
I
LOAD
P U
LOAD
I
LOAD
U U
rms max
larger = larger smaller = smaller I
rms max
P
max
U
2
(UxU) U
rms max
larger = larger smaller = smaller I
rms max
P
max
I I
rms max
smaller smaller = larger larger = U
rms max
P
max
I
2
(IxI) I
rms max
smaller smaller = larger larger = U
rms max
P
max
P P
max
= smaller larger = larger smaller U
rms max
I
rms max
without control larger = larger smaller = smaller U
rms max
I
rms max
P
max
* If one of the limits is exceeded, then the signaling relay K2 and the LED „limit“ react
(default values of parameter settings).
General modulation limit T
s
=T
s max
␣=␣
max
TAB. 1 BEHAVIOUR IN CASE OF LOAD CHANGE