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Page 16 of 24
M6493 Issue 10.3
1IT
0..999s
Integral action time.
The steady-state error is cancelled by inserting an
integral action. The integral action time, determines
the speed with which the steady-state temperature
is achieved, but a high speed (
1IT low) may be the
cause of the overshoot and instability in the
response. With
1IT=0 the integral control is
disabled
1DT
0…999s
Derivative action time
Response overshoot may be reduced by inserting
a derivative Action. A high derivative action (
1DT
high) makes the system very sensitive to small
temperature variations and causes instability. With
1DT=0 the derivative control is disabled.
1AR
0..100%
Reset of integral action time referred to
1BP
Decreasing the paramater
1AR
reduces the integral control action zone, and consequently
the overshoot (see figure on paragraph
1IT
).
1CT
1…255s
Cycle time.
It’s the period in which the output ON time changes. The quicker the system to be controlled
reacts to temperature variations, the smaller the cycle time must be, in order to obtain higher
temperature stability and less sensativity to load variations.
1PF
ON/OFF
Output state in case of probe failure.
*OAU
NON;
THR;
AL0;
AL1
AUX output operation.
NON; output disabled (always off).(
the next p
a
rameter will be
ATM).
THR: output programmed for second thermostat control
(the next parameter will be
2SM
).
AL0: contacts open when an alarm condition occurs
(the next p
ara
meter will be
ATM).
AL1: contacts make when an alarm condition occurs
(the next parameter will be
ATM).
2SM
ABS;
REL
Setpoint 2 mode.
Channel 2 setpoint may be absoulte (2SM=ABS), o a differential relative to setpoint 1
(2SM=REL).
*O
AU
=
RE
L
2
SM
=
ABS
2SP SPL….SPH
Auxiliary output switchover temperature
(the next parameter will be 2CH).
2
SM
=
RE
L
2DF -19.9+19.9°
Temperature differential relative to 1SP. The auxiliary output setpoint is equal to 1SP+2DF
*O
AU=
T
HR
2CH
REF; HEA
Refrigerating control (REF) of heating control mode (HEA) for the auxiliary output.
2HY
0…19.9°
Differential of thermostat 2. With 2HY=0 the auxiliary output always remains off.
2T0
0…30min
Minimum off time.
After output 2 has been turned off, it remains inactive for 2T0 minutes reguardless of the
temperature value measured.
2T1
0…30min
Minimum on time.
After output 2 has been turned on, it remains active for 2T1 minutes regardless of the
temperature value measured.
2PF
ON / OFF
Auxiliary output state in case of probe failure.
On/Off control in heating
(
2SM
= ABS,
2CH
= HEA).
On/Off control in refrigeration
(
2SM
= ABS,
2CH
= REF).
On/Off control in refrigeration. Setpoint 2
relative to setpoint 1 (
OAU
= THR,
2CH
= REF).
On/Off control in heating. Setpoint 2
relative to setpoint 1 (
OAU
= THR,
2CH
= HEA).
