Watlow Series 935B - Manual (Page 15)

Setting PID Menu Values
• Proportional Band, Heat and Cool [Pb`h] and [Pb`c] : Select a value (degrees) to set up band on either side (±)
of the Primary Set Point in which the heat and/or cool proportioning function(s) will be active.
For on/off control, set
[Pb`h] or [Pb`c] = 0.
Range: 0 to 999°F/555°C, or 0.0 to 999.0°F/555.0°C
Default: 25°F/17°C, or 25.0°F/17.0°C
• Hysteresis, Heat and Cool [hYSh] and [hYSc] : For use with on/off control only. Select the value (degrees) for the
process variable change required to re-energize the control heat and/or cool output.
For ON/off control, set
[Pb`h] or [Pb`c] = 0.
Range: 1 to 999°F/555°C, or 0.1 to 999.0°F/555.0°C
Default: 3°F/2°C, or 3.0°F/2.0°C
• Cycle Time, [Ct`h] and [Ct`c] : Select the value (seconds) required for the heat and/or cool output(s) to complete
a full ON through off cycle.
Range: Switched dc/Solid State Relay: 0.1 to 60.0 seconds
Default: 5.0 seconds
Range: Electromechanical Relay: 5.0 to 60.0 seconds
Default: 30.0 seconds
• Dead Band [``db] : Dead Band adjusts the effective cool set point above the primary set point by the Dead Band
value in degrees. This creates a band between the heating and cooling proportional bands where only integral and
derivative activity will occur. For more information on Dead Band fine tuning, go to p. 35.
Range: 0 to 999°F/555°C, or 0.0 to 999.0°F/555.0°C
Default: 0°
• Integral [``It] : Select a value (minutes/repeat) for the integral function. Integral is the inverse of Reset; It(value) =
1/Reset(value).
Range: 0.00 to 99.99 minutes/repeat
Default: 5.00 minutes/repeat
• Derivative [``dE] : Select a value (minutes) for the derivative function.
Range: 0.00 to 9.99 minutes
Default: 0.00 minutes
• Calibration Offset [`CAL] : Eliminates the difference between the displayed process temperature and the actual
process temperature value.
Range: -999 to 9999°F/C, or -99.9 to 999.9F/C
Default: 0°
Watlow Series 935B User’s Manual 15