User manual -
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word 1205, checks the various zones and when all of them have reached the value 4
it will bring to 0 the value of word 1205.
The various devices will regulate the temperature basing on the new values.
N.B. The master must read the Word 1205 at least every 10 seconds or the controller
will automatically exit the autotuning procedure.
7.7 Automatic/Manual regulation for % output control
This function allows to select automatic functioning or manual command of the
output percentage. With parameter 25 (
au.ma.
word 2025), you can select two
methods.
1. The first selection (value 1 of word 2025) allows to modify, through the word
1206, the functioning mode: after writing 1 it is possible to change the output
percentage on word 1206 (range 0-10000).
To return to automatic mode, write 0 on word 1206.
2. The second selection (value 2 of word 2025) enables the same functioning, but
with two important variants:
•
If there is a temporary lack of voltage or after switch-off, the manual
functioning will be maintained as well as the previously set output percentage
value.
•
If the sensor breaks during automatic functioning, the controller moves
to manual mode while maintaining the output percentage command unchanged
as generated by the P.I.D. immediately before breakage.
7.8 Heater Break Alarm on CT (Current Transformer)
This function allows to measure load current to manage an alarm during a malfun-
ctioning with power in short circuit, always open or partial break of the charge.
To enable this function set 1 (50 Hz) or 2 (60 Hz) on paramater 90
c.t.
(word 2090). Set
the value of the connected transfomer on parameter 91
c.t. v.
(word 2091).
• Select on par. 92
H,b.a.t.
the Heater Break Alarm intervention threshold in
Ampere. Otherwise it is possible to select this value in automatic mode pressing
for more than 3 seconds.
• Select on par. 94
H,b.a.d.
the delay time in seconds for the Heater Break Alarm
intervention.
• It is possible to associate the alarm to the output OUT2, selecting 10 on par. 56
aL.
1.
or par. 68
aL. 2.
It is possible also to enable an overcurrent control, setting on parameter 93
ocu.t.
the intervention threshold in Ampere.
