Danfoss VLT FC 102 Operating Instructions Manual page 89

VLT HVAC Low Harmonic Drive Operating In-
structions
3-41 Ramp 1 Ramp Up Time
Range:
Application [Application dependant]
dependent*
3-42 Ramp 1 Ramp Down Time
Range:
Application [Application dependant]
dependent*
4-14 Motor Speed High Limit [Hz]
Range:
Application [Application dependant]
dependent*
NB!
Max. output frequency cannot exceed 10% of the inverter switching frequency (par. 14-01
4-12 Motor Speed Low Limit [Hz]
Range:
Application [Application dependant]
dependent*
4-13 Motor Speed High Limit [RPM]
Range:
Application [Application dependant]
dependent*
NB!
Max. output frequency cannot exceed 10% of the inverter switching frequency (par. 14-01
NB!
Any changes in par. 4-13
in par. 4-13 Motor Speed High Limit [RPM] .
Function:
Enter the ramp-up time, i.e. the acceleration time from 0 RPM to par. 1-25
Choose a ramp-up time such that the output current does not exceed the current limit in
Current Limit during ramping. See ramp-down time in par. 3-42 Ramp 1 Ramp Down
par. 4-18
Time .
tacc × nnorm par .1 − 25
par .3 − 41 =
ref rpm
Function:
Enter the ramp-down time, i.e. the deceleration time from par. 1-25
Choose a ramp-down time such that no over-voltage arises in the inverter due to regenerative
operation of the motor, and such that the generated current does not exceed the current limit set
Current Limit . See ramp-up time in par. 3-41 Ramp 1 Ramp Up Time .
in par. 4-18
tdec × nnorm par .1 − 25
par .3 − 42 =
ref rpm
Function:
Enter the maximum limit for motor speed. The Motor Speed High Limit can be set to correspond to
the manufacturer's recommended maximum of the motor shaft. The Motor Speed High Limit must
exceed the in par. 4-12 Motor Speed Low Limit [Hz] . Only par. 4-11 Motor Speed Low Limit
[RPM] or par. 4-12 Motor Speed Low Limit [Hz] will be displayed depending on other parameters in
the Main Menu and depending on default settings dependant on global location.
Function:
Enter the minimum limit for motor speed. The Motor Speed Low Limit can be set to correspond to
the minimum output frequency of the motor shaft. The Speed Low Limit must not exceed the setting
Motor Speed High Limit [Hz] .
in par. 4-14
Function:
Enter the maximum limit for motor speed. The Motor Speed High Limit can be set to correspond to
the manufacturer's maximum rated motor. The Motor Speed High Limit must exceed the setting in
Motor Speed Low Limit [RPM] . Only par. 4-11 Motor Speed Low Limit [RPM] or
par. 4-11
Motor Speed Low Limit [Hz] will be displayed depending on other parameters in the Main
par. 4-12
Menu and depending on default settings dependant on global location.
Motor Speed High Limit [RPM] will reset the value in par. 4-53 Warning Speed High to the same value as set
®
MG.16.A1.02 - VLT is a registered Danfoss trademark
6 How to Programme the Low Harmonic Drive
s
Motor Nominal Speed to 0 RPM.
s
Switching Frequency ).
Switching Frequency ).
Motor Nominal Speed .
6
89