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Example 2: Switching by process value
When a process reaches 500°C, it is necessary to use other PID settings for optimal
control behavior. Set the alarm set point 1 to 500°C (A1SP = 500°C) to detect the
threshold value. Other setting are, alarm 1 function A1FN = PV1H, alarm 1 mode
A1MD = NORM and EIFN = PID2. Connect the alarm output 1 to the event input, the
process reaches the 500°C, the alarm 1 switches the event input and the second PID
values (PB2, TI2 and TD2) are active.
7.4 Ramps & Timers
Ramp function
The ramp setting is taken into account during heating
or a setpoint change. You can choose between the
minute ramp MINR or hour ramp HRR in the set
point mode. The rate of change of the ramp is set in
the user menu in the parameter RAMP.
Example:
Set are, SPMD = MINR, IN1U = °C, DP1 = 1-DP, RAMP = 10,0 and SP1 = 200°C.
The process starts at 30°C, after 30 minutes the set point (SP1) is changed to 100°C.
Ramp function
Note:
If the ramp function is activated, the lower display shows the current ramp value. To
display or change the setpoint, press the UP-DOWN keys. Set the RAMP value to 0
to deactivate the ramp function.
promesstec GmbH I Niedersachsenstraße 4 I D- 48465 Schüttorf I Tel.:+49 (0)5923/ 90 229 0 I Fax:+49 (0)5923/ 90 229 29
SPMD selection:
or
setting:
E-Mail: office@promesstec.com I Internet: www.promesstec.com
= minute ramp
= hour ramp
= RAMP
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