\\Elmacron-server\Gemensam\Instruktioner\Instruktioner i W ord\1005RE\Engelska\1005RE-ORP%E.doc
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Senast utskrivet 2007-10-11
11:16
4. REGULATION
4.1 ON/OFF REGULATION
At On/Off regulation the "on"-time is decided only by the limit value, when the limit is exceeded the
relay stays "on" until the measured value is within the limit values.
Example of On/Off regulation
Limit value 1
20
%
, high
Limit value 2
40
%
, high
4.2 FREQUENCY REGULATION
At frequency regulation the "on"-time is constant ( 100 ms ). The number of pulses /minute is decided
by the distance between the limit value and the actual value, the chosen proportional band and the
chosen max. frequency.
Example at frequency regulation.
Limit value 1
25
%
, high
Xp-band 20
%
Max frequency
100 pulses/min
The proportional band ( the XP-
band ) is given in % of full
measure range.
Measure range = 0 - 100
%
= 100
%
-units, which gives Xp-band
20% of 100
%
-units = 20
%
-units
in our example.
The frequency ( pulses/minute ) is
given as a linear function between
25
%
and 45
%
, where the
frequency is 0 pulses/minute at
25
%
and 100 pulses/minute at
45
%
and above.
%
10
20
30
40
50
60
limit value 1
limit value 2
on
off
%
Frequency
pulses/min
100
50
10
20
30
40
50
60
Proportional band
limit value 1
