User Manual

IM 12J05D02-01E

5-22 Parameter setting

Code 44 *D.TIME The delay time (or dead 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.

*P.HYST The hysteresis is the value beyond the setpoint that the measured value

*T.HYST must exceed before the control function will start working.

Code 45 *RANGE Proportional range is the value above (or below) the setpoint that generates full

output in proportional control.

*PER. The time period of the overall pulse control cycle (one ON and one OFF

period).

*FREQ. The maximum frequency for the pulse frequency control.

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.