Yokogawa EXA DC402 Dual-Channel Conductivity Analyzer - Manual (Page 48)

IM 12D08E02-01E
Parameter setting 5-23
100
50
0
0.3 s
% controller output
Code Display Function Function detail X Y Z Default values
Contacts (continued)
44
*D.TIME Delay time Minimum relay switching time 0.2 sec.
*SC.HYS Process hysteresis Minimum change of process value 2.0 %
for relay reset after switching
*T.HYST Hysteresis temp. Minimum temperature change for relay 1 °C
reset after switching (fig. 5-3)
*C.HYST Calculation hysteresis 0
45 *RANGE Proportional range When proportional control selected 10.0 %
in code 40, 41, 42 or 43
*PER. Duty cycle period Pulse control On time + Off time (fig. 5-4) 10 sec.
*FREQ. Maximum frequency 100% value for frequency control (fig. 5-5) 70 p/m
46 *tI.CNT Integral time Integral time for relay controls when 100 sec.
PI is set
47 *EXPIR Expiry time Warning of ineffective control action On 1 0 Off
Warning of ineffective control action Off 0
*tE.min Set expiry time Set expiring time using >, ^, ENT keys 15 min
48 *SC1 Set control range Set range for *SC1 (*SC2) for proportional
contact control when *SC1 (*SC2) are not
used on mA1 (mA2)
0% Set begin scale Use >,^, ENT keys to set value
*100% Set end scale Use >, ^ ENT keys to set value
49 Not used
90%
100
50
0
on t t
of f
90%
10%
50% 50%
10
%
Fig. 5-4. Duty cycle control
SC
% of output range
% duty cycle control
Setpoint
Proportional
range
Time
Pulse period
Fig. 5-5. Pulse frequency control
SC
% of output range Setpoint
Proportional
range
Time
Maximum pulse frequency
50 % pulse frequency
No pulses
Fig. 5-3.
t (sec)
LED off
Setpoint
LED on
Delay time Delay time
LED off
Cond./Resist.
Hys.