User manual ACI AC1-2W

[. . . ] – â–  To exit from the setup, press button or wait for 30 seconds. SPH HY; PID DESCRIPTION Readout scale (see table of input specifications) Caution: upon changing the SCL value, it is then absolutely necessary to reconfigure the parameters relevant to the absolute and relative temperatures (SPL, SPH, 1SP, 1HY etc. With 1CM=HY you select control with hysteresis: parameters 1HY, 1T0 and 1T1 are used. [. . . ] – â–  Press buttons or to set the desired value (adjustment is within the minimum SPL and maximum SPH limit). – â–  To store the new value press button , or wait for 10 seconds. – â–  To go back to normal mode without saving the new value, press . The integral action time, determines the speed with which the steady-state temperature is achieved, but a high speed (1IT low) may be the cause of overshoot and instability in the response. 210°), ±2°F] CHANNEL 2 SETPOINT ■■ With the auxiliary output set as thermostat control (OAU=THR), it’s possible to modify setpoint 2 during the normal operation of the controller. – â–  Press and release button : the LED L2 blinks, the display shows 2SP for 1 second if setpoint 2 is an absolute threshold (2SM=ABS), alternatively the display shows 2DF, if setpoint 2 is a threshold relative to setpoint 1 (2SM=REL), then the value associated to the parameter appears. ■■ Press buttons or to set the desired value. – â–  To store the new value press button or wait for 10 seconds. – â–  To go back to normal mode without saving the new value, press . A high derivative action (1DT high) makes the system very sensitive to small temperature variations and causes instability. 1SP Temperature Overshoot WIRING DIAGRAMS STAND-BY Button , when pressed for 3 seconds, allows the controller to be put on a standby or output control to be resumed (with SB=YES only). KEYPAD LOCK The keypad lock avoids undesired, potentially dangerous operations, which might be attempted when the controllers is operating in a public place. In the INFO menu, set parameter LOC=YES to inhibit all functions of the buttons. to resume normal operation of keypad , adjust setting so that LOC=NO. Process temperature Time 1PB data I/O OUT1 8(3)A OUT2 8(3)A 3 4 RS485 TTL V rH data I/O OUT1 8(3)A OUT2 8(3)A 3 4 5 VIN V- V+ CONTROLLER AUTOTUNING IN PID MODE Before starting In the setup mode (see configuration parameters): set 1CM=PID; make sure that 1CH matches the desired operation mode (1CH=REF for refrigerating control, 1CH=HEA for heating control); then adjust setpoint 1SP at the desired value. Start autotuning During normal operation, keep buttons + pressed for 3 seconds. [. . . ] AL0 : contacts open when an alarm condition occurs (the next parameter will be ATM). AL1 : contacts make when an alarm condition occurs (the next parameter will be ATM). Channel 2 setpoint may be absolute (2SM=ABS), or a differential relative to setpoint 1 (2SM=REL) Auxiliary output switchover temperature (the next parameter will be 2CH) 8 9 10 6 7 8 9 10 6 7 1. [. . . ]