CG Drives & Automation, 01-5980-01r2 Functionality 91
Example:
Create a user unit named “kPa”.
1. When in the menu [323] press to show the cursor.
2. Press to move the cursor to the rightmost position.
3. Press until the character “a” is displayed.
4. Press .
5. Then press the until “P” is displayed and press .
6. Repeat until you have entered “kPa”. Confirm with .
Process Minimum [324]
This menu is only visible if a process source is selected in
menu [321].
This function sets the process value that corresponds to the
minimum input signal.
Process Maximum [325]
This menu is only visible if a process source is selected in
menu [321].
The function sets process value that corresponds to the
maximum input signal.
8.3.3 Start setting [330]
Submenu with all the functions for starting.
Start method [331]
The available start methods are:
Linear or Square Torque Control
A properly configured torque-controlled start will lead to a
linear speed increase and low starting current without current
peaks. Fig. 51 shows the torque ramps for linear torque
control and square torque control. The “Initial Torque” value
is set in menu [332] and the value for “End Torque at Start”
is set in menu [333].
Fig. 51 Torque control at start
Voltage Control
Voltage control is selected when a linear voltage ramp is
desired. The thyristor switch on time will be ramped up
linearly, from “Initial Voltage”, menu [334], up to full mains
voltage. See Fig. 52.
Default: No characters shown
Default: 0.000
Range:
0.000-10000
-10000– +10000 (F(AnIn, F(Bus), PT100)
Default: 10.00
Range: 0.000-10000
NOTE:
• Set the initial torque so the motor will start
running immediately.
If the torque is set too high, there will be a
higher start current peak.
• Set End torque at Start so the real ramp time is
according to the set ramp time.
If set too high, the start time will be shorter
than the set Start time, this will cause a higher
current than necessary.
If set too low, there will be a current peak at the
end of the start ramp. This current peak can
cause problems with fuses or circuit breakers.
Time
Torque
Start time [336]
End torque
Nominal torque
Initial torque
1 Linear
2 Square