Bentrup TC 2010 Bedienungsanleitung Seite 38

loop is used to create a 2nd temperature setpoint according to the settings in this
section. This setpoint and the actual ambient temperature are assigned to the slave
control loop driving directly the heating device of the kiln. Note that the master
control loop is configured as heating/cooling loop with a wide proportional range
and slow integral time (P/I/D = 10.0% / 400 s / 0 s)
23: max. temp.diff
Limits the maximum temperature difference between workpiece and kiln
temperature. Used to limit temperature stress to the workpiece. A high limit,
however, speeds up the process
24: max envir.temp
Limits the maximum ambient temperature. Used to avoid damage of the kiln. A
high limit, however, speeds up the process
.
Table 8: control loops
Different control algorithms are available to fit your application
.
00: ctrl.algorithm
Depending on your application different control algorithms are available
PID: Default control algorithm suitable for most applications
C PID: As before, but heating and cooling can be activated independently. Useful
e.g. for gas kilns where availability of heating and cooling depends on burners resp.
cooling device operation. Activation by any digital output
D HYS: Hysteresis control for heating devices which require either temperature
deviation or do not allow short cyclic activation (e.g. discontinuous burners)
P DIR: Direct control. The setpoint is directly converted into a control value
refering to the given value boundaries. Typical application is setting a flap position
directly (e.g. 0 to 100%)
operating instructions bentrup TC20xx V1.9
(value range 99 to 1999)
(value range 99 to 1999)
(options END, PID, C PID, D HYS,
P DIR)
01: setpoint chn
Selects the setpoint used for the control loop
02: input chn
Selects the process value used for the control loop
03: power % on ERR
Predefined process output if an error occurs in the loop e.g. if the process value
failed (overrun, underrun, invalid), process value exceeded the limit set in loop
configuration or the gradient check failed
04: maximum value
Maximum process value. Used to limit the process input value for safety reasons as
well as setting the operation range. If the process value exceeds the limit the
control loop enters error state which can only be cleared by re starting the
programme or pressing CE key. Set this value slightly above the actual operation
range to allow little overshooting
05: grdnt check s
Gradient check used for safety reasons. Prevents the unit from damage if the
feedback signal (e.g. the thermocouple) fails. Checking the increase of the process
value is performed on maximum output (typically +100%). This parameter defines
the checking period in seconds. Set to "0" to disable checking.
06: grdnt chk dif
Required increase of process value during checking period on maximum heating
07: ctrl charact
Depending on the application select the operation range of the control loop as
follows: 0=0% to 100% / 1=100% to 0% / 2= 100% to +100% / 3=+100% to 100%
(value range SP00 to CH19)
(value range SP00 to CH19)
(value range 100 to 100)
(value range 0 to 9999)
(value range 0 to 3600)
(value range 0 to 9999)
(value range 0 to 3)
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