3-42 Ramp 1 Ramp-down Time
Range:
Function:
3 s
*
[1 - 3,600 s]
Enter the ramp-down time, i.e., the deceleration time from the
rated motor speed n
M,N
(par. 1-25) to 0 rpm. Choose a ramp-
down time so that no overvoltage arises in the inverter due to
regenerative operation of the motor, and so 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 =
t
dec
×
n
norm
par
.1
−
25
Δ
ref rpm
s
4-11 Motor Speed Low Limit [RPM]
Range:
Function:
Size re-
lated
*
[0 - 60,000 rpm]
Enter the minimum limit for motor speed. The Motor Speed Low
Limit can be set to correspond to the manufacturer’s recom-
mended minimum motor speed. The Motor Speed Low Limit
must not exceed the setting in par. 4-13
Motor Speed High Limit
[RPM]
.
4-12 Motor Speed Low Limit [Hz]
Range:
Function:
Size re-
lated
*
[0 - 1000 Hz]
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 Motor Speed Low Limit must not exceed
the setting in par. 4-14
Motor Speed High Limit [Hz]
.
4. How to Program
VLT
®
HVAC DRIVE High Power
Instruction Manual
80
MG.11.F1.22 - VLT
®
is a registered Danfoss trademark.
4