2
EWTR/HR/PR 910 12/96 ing
al control. See also “PROPORTIONAL
CONTROL”.
It
: Integral time, expressed in seconds.
Only for models with PID option. The high-
er this setting, the “smoother” the integral
action. A setting of “0” completely elimi-
nates the integral function and changes
the controller from PID to PD (output 1).
See also “PROPORTIONAL CONTROL”.
dt
: derivative time, also expressed in sec-
onds.
Only for models with PID option. The effect
of the derivative action is in direct propor-
tion to this time setting. See also “PRO-
PORTIONAL CONTROL”.
Sr
: Sampling rate, in seconds.
Only for models with PID option. Time be-
tween two successive read-outs, for the
computation of the derivative. A low set-
ting increases the response time, but also
the sensitivity to noise. Recommended
setting is from 1 to 3.
rSt
: manual reSet.
Only for models with PID option. This al-
lows the proportional band to be moved
up or down. This parameter is expressed
in degrees and must be set at a value op-
posite and corresponding to the noticed
error.
Ar
: Anti-reset wind-up band.
Only for models with PID option. This is the
half-band (on either side of the setpoint) in
which the integral action takes place. The
higher this setting, the stronger the integral
action. Recommended initial setting: half
of the value of parameter “Pb”.
Ct
: Cycle time (in seconds).
Only for models with PID option. This is the
total time of one ON+OFF cycle of the re-
lay during the proportional action. See
“PROPORTIONAL CONTROL”.
od
: output delay.
This provides a delay selection for the out-
puts in applications where noise may
cause brief erroneous signals from the
sensor to the controller. Factory set at “0”.
Lci
: Lower current input.
Read-out corresponding to the “low end
scale” input signal of 4 mA; only for mod-
els with current input.
Hci
: Higher current input.
Read-out corresponding to the “high end
scale” of 20 mA; only for models with cur-
rent input.
LAO
: Low Analog Output.
Low end of scale setting of analog output
(only for models with this option; see para-
meter “AOF”).
HAO
: High Analog Output.
High end of scale setting of analog output
(only for models with this option; see para-
meter “AOF”).
CAL
: CALibration.
This offers an adjustment up or down of
the read-out, if needed.
Factory set at “0”.
PSE
: Probe SElection.
Input type (for RTD or Thermocouples
only).
RTD models: Ni = Ni100; Pt = Pt100.
T/C models: FE = TcJ; Cr = TcK.
AOF
: Analog Output Function.
Analog output function (only for models
with this option; see parameters “LAO”
and “HAO”).
ro (read-out) = proportional to the system
temperature, within the read-out values
specified by parameters “LAO” and
“HAO”.
Er (Error) = proportional to temperature de-
viation from Setpoint, within the values
specified by parameters “LAO” and
“HAO”.
HC1
: Heating / Cooling output 1.
Relay switch function output 1.
H = Heating (humidification; reverse ac-
tion);
C = Cooling (dehumidification; direct ac-
tion).
rP1
: relay Protection 1.
Determines the status of the relay in case
of sensor defect. Factory set at “ro”.
ro = relay open; rc = relay closed
LF1
: Led Function 1.
Determines whether the status light is ON
or OFF in relation to output 1.
di = direct = light ON when output 1 is en-
ergized;
in = reverse = light OFF when output 1 is
energized.
dP
: decimal Point.
Choose whether the resolution is required
with or without decimal point.
oF = without decimal point;
on = with decimal point.
NOTES: (a) the decimal point of models
with current or voltage input is shifted: the
actual value of parameters “Lci” and “Hci”
must be multiplied by 10; (b) on all ver-
sions, if a unit is changed from without
decimal point to with decimal point, all pa-
rameter values expressed in degrees will
automatically be divided by 10, including
the setpoint !! (c) the decimal point selec-
tion is not available on models for thermo-
couple input.
dro
: display read-out.
Display read-out reversal.
P (Process value) = system temperature
display.
S (Setpoint value) = setpoint temp. display.
AOS
: Analog Output Security (only for
models with this optional analog output).
Sensor protection analog output.
Ao (Analog output on) = analog output ON
(100%) in case of sensor defect;
AF (Analog output oFf) = analog output
OFF (0%) in case of sensor defect.
hdd
: half digit display.
The right-most digit can be set to read-out
DEFAULT SETTINGS - STANDARD MODELS
Parameter
d1
LS1
HS1
Pb*
It*
dt*
Sr*
rSt*
Ar*
Ct*
od
Lci
Hci
LAO**
HAO**
CAL
PSE
AOF**
HC1
rP1
LF1
dP
dro
AOS**
hdd
tAb
* Parameters visible only for special models with proportional operation (PID).
** Parameters visible only for special models with analog output.
Description
differential set 1
Lower Set limit 1
Higher Set limit 1
Proportional band
Integral time
derivative time
Sampling rate
manual reSet
Anti reset
Cycle time
output delay
Low current input
High current input
Low Analog Output
High Analog Output
CALibration
Probe SElection
Analog Output Function
Heating / Cooling out 1
relay Protection 1
Led Function 1
decimal Point
display read-out
Analog Output Security
half digit display
tAble of parameters
Range
min / max
min / max
min / max
0.1 (1) / max
0 / 999
0 / 999
1 / 10
min / max
0 / max
1 / 500
min / max
min / max
min / max
min / max
min / max
min / max
Ni / Pt / Fe / Cr
ro / Er
H / C
ro / rc
di / in
on / oF
S / P
Ao / AF
n / y
/
Unit
various
various
various
various
seconds
seconds
seconds
various
various
seconds
seconds
various
various
various
various
various
/
flag
flag
flag
flag
flag
flag
flag
flag
/
Default
1 (C) / –1 (H)
min
max
100
500
30
1
0
100
30
0
min
max
min
max
0
/
ro
/
ro
di
oF
P
AF
n
/