5-28 Parameter setting
IM 12B6B3-E-H
Code 44 *D.TIME The delay time sets the minimum relay switching time. This function can be
adjusted to give a good alarm function in a noisy process, preventing the relay
from "chattering" or repeatedly switching when the signal is close to the setpoint.
*PH.HYS The hysteris is the value beyond the setpoint that the measured value must
*mV.HYS exceed before the control function will start working.
*rH.HYS
*T.HYS
Code 45 *RANGE Proportional range is the value above (or below) the setpoint that generates full
output in proportional control. This is in the units of the main parameter (pH or
mV).
*rH.RNG This is the proportional range in rH and is only enabled when the converter is set
up for rH measurement.
*PER. The time period of the overall pulse control cycle (one ON and one OFF period).
See fig. 5-3.
*FREQ. The maximum frequency for the pulse frequency control. See fig 5-4.
Code 46 *tI.CNT The integral time for the PI control settings.
Code 47 *EXPIR When a system is set up to control on the relay outputs, the expiry time can be
enabled to warn of an ineffective control. In other words, when the setpoint is
exceeded for more than 15 minutes an error message is generated. This can
mean, for example, that the reagent tank is empty.
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