SEW-Eurodrive MOVITRAC 07, Системное руководство

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System Manual – MOVITRAC® 07
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PI-controller
Project Planning
Actual value
acquisition Unipolar input AI1 is the actual value input.
You can acquire the actual value as follows using P253 PI actual value mode :
• 0 ... 10 V: The following applies to operation as a voltage input:
0 ... 10 V = 0 ... 100 % PI-controller actual value
• 0 ... 20 mA: The following applies to operation as a current input:
0 ... 20 mA = 0 ... 100 % PI-controller actual value
• 4 ... 20 mA: The following applies to operation as a current input:
4 ... 20 mA = 0 ... 100 % PI-controller actual value
You can scale the actual value acquired using P253 PI actual value mode with a factor
between 0 and 10.
This parameter allows you to assign an offset subsequently to the scaled actual value.
The scaled value with its offset is the actual value for the PI-controller.
You can read the actual value via RS-485 or SBus using the following bus parameters:
Reference signal With this parameter, you can program a reference signal with regard to the actual value
of the PI-controller. By doing this, you can monitor the actual value for violation of a limit
value, for example.
A binary output terminal must be programmed to "PI ACTUAL VALUE REFERENCE" in
order to output the reference signal. The reference signal operates with a hysteresis of
5 %. The reference signal does not have a delay time and signals ’1’ depending on
P451.
Either binary output DO01 [list box] P620 or binary output DO02 [list box] P621 must be
programmed to PI ACT.VALUE REF.
P254 PI actual value scaling 0.1 ... 1 ... 10 Step width: 0.01
P255 PI sensor offset 0 ... 100 [%] Step width: 0.1 %
P873 Actual value description PI1 [PI-controller [%]]
P874 Actual value description PI2 [PI-controller [%]]
P875 Actual value description PI3 [PI-controller [%]]
PI1 = 0 ... 2
14
= 0 ... 100 % PI-controller setpoint
PI2 = 0 ... 2
14
= 0 ... 100 % PI-controller setpoint
PI3 = 0 ... 2
14
= 0 ... 100 % PI-controller setpoint
P450 PI actual value refer-
ence 0 ... 100 [%] Step width: 0.1 %
P451 Signal = "1" if: PI actual value < PI reference
PI actual value > PI reference