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4.4.10 - P08 Speed Control Menu
The speed control function provides a loop control P I of the frequency inverter (using the 4-20mA output) to keep a stable target pressure
level (load pressure P1).
The speed control is used to keep the line pressure at the adjusted level for the load pressure. If the pressure rises to the level adjusted for
the unload pressure, the solenoid is powered off and the compressor goes into unload mode.
While in unload status, the interface will keep the compressor at minimum speed. When the unload time (Rt) ends, the compressor will go
into standby mode. When the pressure drops to a value lower than the one adjusted for the load pressure, the motor will restart and the load
solenoid will power on, if it's in standby status. The maximum speed control will then be applied.
If connected to a Schulz compressors manager, and the system has more than one FLEX compressor (variable speed), any FLEX compressor
designated as main will be adjusted to operate at the optimum speed value. Any FLEX compressor designated as slave will use the maxi-
mum speed control. In addition to this, the target pressure of each FLEX compressor will be automatically informed to the manager to keep
a precise pressure control, independent from the pressure differential among the compressors.
Item Nº
Description
01
Speed control
02
Maximum speed
03
Minimum speed
04
Optimum speed
05
Shutdown speed
06
Actual Rpm
07
Actual Current
08
Constant P
09
Constant I
10
Control Percentage
11
Speed variation rate
Speed control mode:
To disable the speed control for a fixed speed motor, select the mode "0". To operate in fixed speeds, select the mode "1".
The motor will operate at the adjusted optimum speed, and at the unload speed when in unload mode. The speed transition is determined
by the maximum acceleration rate. To use a compressor regulated by the maximum variable speed, select mode "2".
Maximum Speed
Minimum Speed
Optimum Speed
Unload Speed
P Factor
I Factor
Speed variation rate
Control Percentage: Shows the speed variation percentage in which the minimum speed is represented by 0% and the maximum is 100%.
Digital Input for Remote Load Function:
If enabled for variable speed control, the digital input for remote load will operate the compressor in speed control mode "1" , independent
from the mode configuration. If adjusted in mode "2", the compressor will go to operation mode "2" when the input that enables remote
load is deactivated.
4.4.11 - P09 Calibration Menu
Calibration settings for the pressure sensor.
Calibration settings for analog pressure sensors.
When an item is selected, the "Line pressure" item will show the real pressure for the selected item, using the existing calibration values.
As the calibration values are adjusted, the item will immediately show the new value adjusted for the pressure.
Note: Before the calibration is initiated, make sure the "nominal interval" configuration of the sensor is correct.
Offset: To calibrate the offset, expose the appropriate sensor to the atmosphere and adjust the offset to make the pressure display show
0,0 bar.
Units
Step
---
1
rpm
100
rpm
100
rpm
100
rpm
100
rpm
---
mA
---
---
1
---
1
%
---
%
1
Sets the motor speed at a 20mA output
Sets the motor speed at a 4mA output
Optimum Speed when loading
Motor speed when unloading
Maximum permitted rate for variation, expressed in % of maximum speed per second
(example: Max 3000rpm, min 1500rpm, 10% acceleration rate = 150rpm/second at maximum)
95
Min.
Máx.
0
2
100
10000
0
9900
100
10000
1
9900
---
---
---
---
0
100
0
100
---
---
5
100
PI loop proportional factor
PI loop integration factor
Display
SC
0=Disabled
1= Fixed speed control
2=Variable Speed control
SH
SL
So
Su
S>
Visualization only for information
S>
Visualization only for information
Pf
lf
C>
Visualization only for information
rr
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