SX25 Series Process Controller - Spirax Sarco

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5.5 Parameter description First Group The controller parameters have been organised in groups, according to their functionality. A2SP A3SP AL2 alarm threshold AL3 alarm threshold The alarms use OP1, OP2 and OP3 outputs in different ways, according to the configured types of alarms, as illustrated. With double action control output, (VMD or heating and cooling). There is only one control output left. Alarm AL2 and AL3 will share the same output. (see table on page 14). Proportional Pb band This parameter specifies the proportional band coefficient that multiplies the error (SP - PV) t¡ Integral time The integral time value specifies the time required by the integral term to generate an output equivalent to the proportional term. When Off the integral term is not included in the control algorithm. td Derivative time The time required by the proportional term P to repeat the output provided by the derivative term D. When Off the derivative term is not included in the control algorithm. tc Control output cycle time Cycle time tc C cool This is the cycle time of the logic control output. 30 IM-P323-25 CH Issue 3
OC Overshoot control (Automatically disabled when the adaptive tuning is running). This parameter specifies the span of action of the overshoot control. The lower the O.C. value is, the smaller the overshoot will be during a set point change.The overshoot control doesn’t affect the PID algorithm. If set to 1, the overshoot control is disabled. Heat/Cool dbnd dead band This parameter specifies the width of the deadband between the Cool and the Heat channel. NUtn Valve travel time NUHY Valve movement sensitivity Control output OP H high limit Cool output OPHC high limit This parameter specifies the maximum value the control output can be set HY hy C Control output hysteresis Cool output hysteresis Control or alarm output hysteresis span, set in % of the full scale. SL v SL d Setpoint ramp up Setpoint ramp down This parameter specifies the maximum rate of change of the Setpoint in digit / min. When the parameter is Off, this function is disabled. A2hy A3hy AL2 alarm hysteresis AL3 alarm hysteresis Hysteresis of the threshold of both the alarms, that activate OP1 and OP2 control output. It is specified as a % of the full scale. Setpoint SP L low limit Setpoint SP H high limit Low / high limit of the Setpoint value. AL2, AL3 A2Lb latching and blocking A3Lb functions For each alarm it is possible to select the following functions non£ none Ltch latching bloc blocking LtbL both latching and blocking IM-P323-25 CH Issue 3 31
Page 1 and 2: 3231450/3 IM-P323-25 CH Issue 3 SX2
Page 3 and 4: General Index 1. Safety Information
Page 5 and 6: viii) A disconnecting device (switc
Page 7 and 8: 2.2 Dimensional details 2.3 Panel c
Page 9 and 10: 2.5 Panel mounting 2.5.1 Insert the
Page 11 and 12: 3.2 Precautions and advised conduct
Page 13 and 14: 3.3.2 PV control unit D For mA, mV
Page 15 and 16: SX25 mA Output combination 3.3.5 -
Page 17 and 18: 3.3.5 - L Double Action Logic/ Rela
Page 19 and 20: 4.1 Configuration coding The config
Page 21 and 22: 5.1 Keys and display overview 5 Ope
Page 23 and 24: 5.3 Parameter setting 5.3.1 Numeric
Page 25 and 26: 5.3.3 Keypad lock To lock/unlock th
Page 27 and 28: P 33 PpAss Password entry only if C
Page 29: pass Password entry only if Code va
Page 33 and 34: Second group tf ¡l Input filter ti
Page 35 and 36: Analogue control output OP4 r£tr A
Page 37 and 38: Password entry only if Cod£ value
Page 39 and 40: 6 Commissioning Examples When the c
Page 41 and 42: First group parameters Press the sc
Page 43 and 44: 6.2 Example of temperature control
Page 45 and 46: Second group parameters The display
Page 47 and 48: The self-learning Adaptive Tuning i
Page 49 and 50: Features (at 25°C environmental te
Page 51: Features (at 25°C environmental te

SX25 Series Process Controller - Spirax Sarco

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