Relay Control - Deif Multi-line 2 Designers Reference Handbook

AGC
The integrating function of the I regulator is increased, if the integral action coefficient, KI, is
increased. This means that the reset time gets smaller and a faster I regulation is achieved. If
the KI is adjusted to 0 (reset time endless), the I regulator is switched off.
The integral action coefficient, KI, must not be too high. This will make the
regulation hunt similar to a too high proportional action factor, KP.
When the relay outputs are used for control purposes, the regulation works like this:
Fix up signal
The regulation with relays can be split up into five steps.
# Range Description
1 Static range Fix up signal
2 Dynamic Up pulse
range
3 Dead band No reg.
area
4 Dynamic Down pulse
range
5 Static range Fix down signal
DEIF A/S

Relay control

Regulator
45Hz
Up pulse No reg.
Comment
The regulation is active, but the increase relay will be
constantly activated because of the size of the regulation
deviation.
The regulation is active, and the increase relay will be
pulsing in order to eliminate the regulation deviation.
In this particular range no regulation takes place.
The regulation accepts a predefined dead band area in
order to increase the lifetime of the relays.
The regulation is active, and the decrease relay will be
pulsing in order to eliminate the regulation deviation.
The regulation is active, but the decrease relay will be
constantly activated because of the size of the regulation
deviation.
output
50Hz
Down pulse
Designer's Reference Handbook
55Hz
Hz
Fix down signal
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