motortronics CSD Series, Operation & Service Manual

Page: 42 / 76

CSD Series Variable Frequency AC Drive
MOTORTRONICS
- 38 -
Fn37 to Fn41: Custom Program V/f Pattern Setpoints.
If there is not a suitable preprogrammed V/f pattern for the application,
change Fn5 = 18 and select the required values for Fn37 to Fn41 that
will satisfy the requirements of the application. See Figure 5 - 7 and
Table 5 G for a graphic description of the correct programming of the
custom V/f pattern settings. Depending on the application, when Fn37
is changed, Fn06 may need to be changed.
GP = General Purpose
CT = Constant Torque
VT = Variable Torque
CHP = Constant Horsepower
Table 5 G - V/f Patterns
Fn42 = Start Frequency Adjustment - Factory Setting = 1 Hz;
Range = 0.1 to 10 Hz
Fn42 determines the drive’s initial frequency at start up. Program Fn42
to set the initial start frequency the application requires.
Note: If speed
search has been enabled, the drive will override this feature, find the
actual frequency of the motor and start the output pattern at that
point.
Fn43 = Carrier Frequency - Factory Setting = 14; Range = 0 to 15*
Fn 43 changes the drive’s carrier frequency. The larger the number in
Fn43, the higher the carrier frequency. A higher carrier frequency provides
quieter motor operation but generates more heat inside the motor.
High carrier frequencies can also cause interference to external
electronic devices or cause unwanted motor vibration. A lower carrier
frequency causes less heat generation in the motor but will be slightly
louder. Choose the correct carrier frequency for the application.
CSD-205 - 210, CSD-407 - 410 CSD-215 - 230, CSD-415 - 430
CSD-2P5 - 203 & CSD 401 - 405
V
Fn38
(Vmax)
0.1
Fn39 Fn37 400 Hz
Figure 5 - 7
V/f Pattern
Table 5 H - Fn43 Settings