Danfoss VLT Series Programming Manual page 57

Parameter Description
3-57 Ramp 2 S-ramp Ratio at Decel. Start
Range:
50 % [1 - 99. %] Enter the proportion of the total ramp-down
*
3 3
3-58 Ramp 2 S-ramp Ratio at Decel. End
Range:
50 % [1 - 99. %] Enter the proportion of the total ramp-down
*
3.5.5 3-8* Other Ramps
3-80 Jog Ramp Time
Range:
Size [1.00 -
related 3600.00
*
s]
RPM
P 4-13 RPM
high limit
P 1-25
Motor speed
P 3-19
Jog speed
P 4-11 RPM
low limit
56
®
VLT HVAC Drive Programming Guide
Function:
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.
Function:
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.
Function:
Enter the jog ramp time, i.e. the
acceleration/deceleration time between 0
RPM and the rated motor speed (n
in 1-25 Motor Nominal Speed). Ensure that
the resultant output current required for
the given jog ramp time does not exceed
the current limit in 4-18 Current Limit. 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
s
jog speed par . 3 − 19
t jog t jog
P 3-80 P 3-80
Ramp up
Ramp down
(acc) (dec)
MG.11.CC.02 - VLT
3-81 Quick Stop Ramp Time
Range:
3.00 [0.01 -
s 3600.00 s]
*
) (set
M,N
Par . 3 − 81 =
Δ
3-82 Starting Ramp Up Time
Range:
Size related
*
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
Time
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.
®
is a registered Danfoss trademark
Function:
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.
RPM
P 4-13 RPM
high limit
Reference
P 1-25
Motor speed
P 4-11 RPM
low limit
P 3-81
Qramp
Qstop
t Qstop s x n s RPM
jog ref ( par . 3 − 19 ) RPM
Function:
[0.01 - The ramp-up time is the
3600.00 s] acceleration time from 0rpm to the
nominal motor speed set in
3-82 Starting Ramp Up Time when
Compressor Torque is active in
1-03 Torque Characteristics.
Time