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| HPI Combi Flow User Guide |
Version 3.11
www.lafert.com
Par.
Parameter Name
Minimum
Maximum
Default
Units
P2-38
Mains Loss Stop / Ride Through
0
3
0
-
Controls the behaviour of the drive in response to a loss of mains power supply whilst the drive is enabled.
0 : Reserved.
1 : Coast to stop.
The HP Combi Flow will immediately disable the output to the motor, allowing the load to coast or free wheel.
When using this setting with high inertia loads, the Spin Start function (P2-26) may need to be enabled.
2 : Fast ramp to stop.
The drive will ramp to stop at the rate programmed in the Fast deceleration time P2-25. NA Coast to stop is
the only applicable action on mains loss in the HP Combi Flow.
3 : DC bus supply.
NA Coast to stop is the only applicable action on mains loss in the HP Combi Flow
P2-39
Parameter Lock
0
1
0
-
0 : Unlocked.
All parameters can be accessed and changed
1 : Locked.
Parameter values can be displayed, but cannot be changed. Also disables Hand and Auto button on keypad.
P2-40
Extended Menu Access Code
0
9999
101
-
Defines the access code which must be entered in P1-14 to access parameter groups above Group 1.
9.2. Parameter Group 3 – PID Control
Par.
Parameter Name
Minimum
Maximum
Default
Units
P3-01
PID Proportional Gain
0.1
30.0
1.0
-
PID Controller Proportional Gain. Instantaneous error between the feedback and the set-point in the PID controller is multiplied by
P3-01 to produce the output from the PID controller. Higher values of proportional gain produce a larger change in the drive output
frequency in response to changes in the PID set-point or feedback signals. Too high a value can cause instability.
P3-02
PID Integral Time
0.0
30.0
1.0
Seconds
PID Controller Integral Time. Accumulated error in the PID control. Uses accumulated errors between set-point and feedback signals
to influence the output from the PID controller. P3-02 is the time constant for accumulating error. Larger values provide a more damped
response. Lower values result is a faster system response but may result in instability.
P3-03
PID Differential Time
0.00
1.00
0.00
Seconds
PID Differential Time Constant. The Differential time constant references the rate of change of the feedback signal over time and
works to slow the rate of change of the PID controller, particularly as it approaches the set-point. Setting a shorter time will decrease
overshoot but slow down response and may lead to instability.
NOTE
P3-03 is set to 0 by default which disables the differential time constant. Care must be taken when adjusting this value outside
of its default value.
P3-04
PID Operating Mode
0
1
0
-
0 : Direct operation.
Use this mode if an increase in the feedback signal should result in a decrease in the motor speed.
1 : Inverse operation.
Use this mode if an increase in the feedback signal should result in an increase in the motor speed.
P3-05
PID Reference Select
0
2
0
-
Selects the source for the PID Reference / Set-point
0 : Digital preset.
P3-06 is used.
1 : Analog input 1
2 : Analog input 2
P3-06
PID Digital Reference Value
0.0
100.0
0.0
%
When P3-05 = 0, this parameter sets the preset digital reference (set-point) used for the PID Controller.
P3-07
PID Output Upper Limit
P3-08
100.0
100.0
%
Limits the maximum value output from the PID controller.
P3-08
PID Output Lower Limit
0.0
P3-07
0.0
%
Limits the minimum output from the PID controller.
P3-09
PID Output Limit Select
0
3
0
-
0 : Digital output limits.
The output range of the PID controller is limited by the values of P3-07 & P3-08.
1 : Upper limit set by analog input 1.
The output range of the PID controller is limited by the values of P3-08 & the signal
applied to Analog Input 1.
2 : Lower limit set by analog input 1.
The output range of the PID controller is limited by the signal applied to Analog Input 1
& the value of P3-07.
3 : PID output added to analog input 1.
The output value from the PID Controller is added to the speed reference applied to
the Analog Input 1.
9
Extended P
arameters
