Danfoss VLT HVAC Operating Instructions Manual page 58

6. How to programme the frequency converter
1-24
Value:
0.1 - 10,000 A
Function:
Enter the nominal motor current value from
the motor nameplate data. This data is used
for calculating motor torque, motor thermal
protection etc.
This parameter cannot be adjusted while the
motor is running.
1-25
6
Value:
100 - 60,000 RPM
Function:
Enter the nominal motor speed value from the
motor nameplate data. This data is used for
calculating automatic motor compensations.
This parameter cannot be adjusted while the
motor is running.
3-41
Value:
1 - 3600 s
Function:
Enter the ramp-up time, i.e. the acceleration
time from 0 RPM to the rated motor speed
n
M,N
that the output current does not exceed the
current limit in par. 4-18 during ramping. See
ramp-down time in par. 3-42.
par
.3 − 41 =
58
Motor Current
Motor Nominal Speed
Ramp 1 Ramp up Time
(par. 1-25). Choose a ramp-up time such
t n par
×
acc norm
ref rpm
Δ
MG.11.A4.02 - 09.10.06. VLT
3-42
Value:
1 - 3600 s
Size related
Function:
Enter the ramp-down time, i.e. the decelera-
tion time from the rated motor speed n
(par. 1-25) to 0 RPM. 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 in par.
4-18. See ramp-up time in par. 3-41.
par
.3 − 42 =
Size related
4-11
Value:
0 - 60,000 RPM
Function:
Enter the minimum limit for motor speed. The
Motor Speed Low Limit can be set to corre-
spond to the manufacturer's recommended
minimum motor speed. The Motor Speed Low
Limit must not exceed the setting in par. 4-13
Motor Speed High Limit [RPM]
3 s
4-12
Value:
0 - 1000 Hz
Function:
Enter the minimum limit for motor speed. The
Motor Speed Low Limit can be set to corre-
spond to the minimum output frequency of
.1 − 25
the motor shaft. The Motor Speed Low Limit
s
must not exceed the setting in par. 4-14
Speed High Limit [Hz]
® is a registered Danfoss trademark
®
VLT HVAC Drive Operating Instructions
Ramp 1 Ramp Down Time
t n par
× .1 − 25
dec norm
ref rpm
Δ
Motor Speed Low Limit [RPM]
Size related
.
Motor Speed Low Limit [Hz]
Size related
Motor
.
3 s
M,N
s