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3-57 Ramp 2 S-ramp Ratio at Decel. Start
Range:
Function:
50 %
*
[1 - 99. %] Enter the proportion of the total ramp-down
time (
3-52 Ramp 2 Ramp down Time
) where
the deceleration torque increases The larger
the percentage value, the greater the jerk
compensation achieved, and thus the lower
the torque jerks in the application.
3-58 Ramp 2 S-ramp Ratio at Decel. End
Range:
Function:
50 %
*
[1 - 99. %] Enter the proportion of the total ramp-down
time (
3-52 Ramp 2 Ramp down Time
) where
the deceleration torque decreases. The larger
the percentage value, the greater the jerk
compensation achieved, and thus the lower
the torque jerks in the application.
3.5.5 3-8* Other Ramps
3-80 Jog Ramp Time
Range:
Function:
Size
related
*
[1.00 -
3600.00
s]
Enter the jog ramp time, i.e. the
acceleration/deceleration time between 0
RPM and the rated motor speed (n
M,N
) (set
in
). Ensure that
the resultant output current required for
the given jog ramp time does not exceed
the current limit in
. The
jog ramp time starts upon activation of a
jog signal via the control panel, a selected
digital input, or the serial communication
port.
par. 3 − 80 =
tjog × nnorm par. 1 − 25
jog speed par. 3 − 19 s
130BA070.10
Time
P 3-80
RPM
P 4-13 RPM
high limit
P 1-25
Motor speed
Jog speed
P 3-19
P 3-80
Ramp up
(acc)
Ramp down
(dec)
t jog
t jog
P 4-11 RPM
low limit
3-81 Quick Stop Ramp Time
Range:
Function:
3.00
s
*
[0.01 -
3600.00 s]
Enter the quick–stop ramp-down time, i.e.
the deceleration time from the synchronous
motor speed to 0 RPM. Ensure that no
resultant over-voltage will arise in the
inverter due to regenerative operation of the
motor required to achieve the given ramp-
down time. Ensure also that the generated
current required to achieve the given ramp-
down time does not exceed the current limit
(set in
4-18 Current Limit
). Quick-stop is
activated by means of a signal on a selected
digital input, or via the serial communication
port.
130BA069.10
Time
RPM
P 4-13 RPM
high limit
Reference
P 1-25
Motor speed
low limit
P 4-11 RPM
P 3-81
Qramp
Qstop
Par. 3 − 81 =
tQstop s x ns RPM
Δ
jog ref (par. 3 − 19) RPM
3-82 Starting Ramp Up Time
Range:
Function:
Size related
*
[0.01 -
3600.00 s]
The ramp-up time is the
acceleration time from 0rpm to the
nominal motor speed set in
when
Compressor Torque is active in
.
3.5.6 3-9* Digital Pot.Meter
The digital potentiometer function allows the user to
increase or decrease the actual reference by adjusting the
set-up of the digital inputs using the functions INCREASE,
DECREASE or CLEAR. To activate the function, at least one
digital input must be set up to INCREASE or DECREASE.
Parameter Description
VLT
®
HVAC Drive Programming Guide
56
MG.11.CC.02 - VLT
®
is a registered Danfoss trademark
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