ALTEC
CONTROLLER DC220
Operation parameter list
Mnemonic
T2
TVNE
AL 1
KYS1
PROP
INT.T
K C.T
LOC
DT
SN
4
5
6
7
8
11
12
14
15
Parameter
Temperature 2
Difference of Temperature
PID Auto-tune
Alarm value 1
Alarm 1 hysteresis
Proportional band
Integral time
Output cycle
Configuration password
Adjustable Range
0FF
ON
Measurement range
0.01~99.99
1~9999 °C
0FF, 1~8000 sec.
0.1~240.0 seconds
0~9999
Comments
Input 2 measured temperature(Read only)
DT = T1 - T2 (Read only)
T 1
3 Temperature 1 Input 1 measured temperature(Read only)
[ 1
1 Ratio Coefficient 0.01~99.99
SP
2 Setpoint SP K ~ SP L
AL2
KYS2
9
10
Alarm value 2
Alarm 2 hysteresis
Measurement range
0.01~99.99
DER.T
13 Derivative time 0FF, 1~999 seconds
Turn off PID auto-tune
Turn on PID auto-tune
7.4 Modifying the Operation Parameter
When the controller is in the PV/SV displaying status, press PAR key and hold for 3 seconds reveals the first
parameter. The parameter value can either be modified with the or key, or left unmodified. Press PAR
key again, the next parameter and its current value appears, the modified data has been saved.
or there’s no key operation within 16 seconds, the menu times out
automatically.
▲ ▼
If the last parameter is displayed
1). Regulation parameters - PROP,INT.T,DER.T
These three parameters directly affect the precision of control. The PID auto-tuning function could automatically
measure, compute, and set these three constants. If the controller is configured as an ON/OFF controller([TRL = 0N.0F),
the proportional band(PROP) becomes the output hysteresis.
proportional band(PROP) is the band of error within which the power output is proportional to the error. Error values
outside this band give 100% or 0% power output. If the proportional band is too narrow it will give control resembling
on/off control with continuous oscillation. Wide proportional bands give stable but sluggish control with an offset in the
steady-state condition.
Parameter INT.T provides automatic compensation for long term control offsets. It is the time taken for the output to
change by one proportional band width for a constant error equal to the proportional band. Typically this must be set to a
value longer than the response time of the process being controlled.
The parameter DER.T provides anticipation and fast recovery from disturbances. It can be taken as the 'look ahead' period
of the controller. It is typically set to a time approximately one sixth of the integral time.
2). Output cycle time - K C.T
If output 1 was set as time-proportioned output(0P1 = TP), the output cycle time(code: K C.T) should be set to high
values(e.g. 10 seconds) if contactors are used, and to low values(e.g. 2 second) if thyristors or SSR are used.
Operation parameters description
Disappears when (TRL = 0N.0F
Disappears when KYS = 0FF
Disappears when KYS = 0FF
Appears when FVNC = PRO
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