Operating instructions

17
2.3 Control types
Thyro-A …H 1 has two control types. Mains voltage variations and load changes
are directly and quickly adjusted by bypassing the sluggish temperature control
system.
Before commissioning the Power Controller and selecting a control mode, familiari-
sation with the operating procedure and the effect upon the application is important.
2.3.1 Controlled value
The controlled value effective on the load is proportionate to the total set point,
depending on the control type.
Control type Control value (proportionate to the total set point)
U output voltage, U
rms
U
2
output voltage, U
rms
2
2.3.2 Controller response
If the load resistance changes, e.g. due to temperature effect, ageing or load fault,
the values effective on the load change as follows:
Underlying Load resistance decreases
P
U
Load
I
Load
P
U
Load
I
Load
Load resistance increases
control
U
U
rms max
larger =
=
larger
larger
smaller
smaller
=
=
smaller
smallerlarger
U
rms max
U
2
(UxU)
limit
Tab. 1 Behaviour with load change
2.4 Indications
2.4.1 LED indications
The LEDs on the front signal the following states:
• ON green operating indication, power supply controller device
• PULSE INHIBIT red pulse lock active
Blinking indications are described in chapter 3.3.