34
4 - Operations
CURRENT TRANSFORMER INPUT
When configured, the analogue
control output excludes the
corresponding time propor-
tioning control output auto-
matically.
(see page18)
(e.g. if code
l
= 0 and
#rt.h
=
M.U.
. the OP1 is not
yet available)
Analogue control
output range
0=20
/
4=20
Control output
selection
none
Not used
M.U.
Heat
(single action)
M.U. C.
Cool
With analogue control output
#tc
or
#tc C
are not present.
#rt.H
#retr
ANALOGUE CONTROL
OUTPUT OP4
With CT option it is possible to dis-
play the load current and set an
alarm threshold.
It is possible to set AL2 or AL3
(index 8 and 9) to have an alarm
when, during the ON time of the
time proportional output, the load
current is less then the specified
threshold or, during the OFF time,
there is at least 3% of full scale
load current
The alarm condition must be longer
than 120 ms to set the alarm.
During the OFF time the parame-
ter
tCur
latches the last on time
current value
Example:
CT input on OP1, alarm on AL2 dur-
ing on time (configuration digit N = 8)
ON
ON
ON
ON
3%
A2s.p
t.Cur
120 ms
120 ms
OFF
OP1
AL2
OFF
OFF
OFF
Load curr
ent
M4UK.ed6 20-05-2005 11:43 Pagina 34
