Danfoss VLT AQUA Drive FC 200 Programming Manual page 61

Parameter Description
3.5.4 3-5* Ramp 2
Choosing ramp parameters, see parameter group 3-4*.
3-51 Ramp 2 Ramp-up Time
Range: Function:
Size [ 1.00 Enter the ramp-up time, i.e., the acceleration
related - 3600 time from 0 RPM to 1-25 Motor Nominal Speed.
*
s] Choose a ramp-up time such that the output
current does not exceed the current limit in
4-18 Current Limit during ramping. See ramp-
down time in 3-52 Ramp 2 Ramp-down Time.
par . 3 − 51 =
3-52 Ramp 2 Ramp-down Time
Range: Function:
Size Enter the ramp-down time, i.e., the
related [ 1.00 deceleration time from 1-25 Motor Nominal
*
- 3600 Speed to 0 RPM. Choose a ramp-down time
s] such that no overvoltage 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 4-18 Current
Limit. See ramp-up time in 3-51 Ramp 2 Ramp-
up Time.
tdec × nnom par . 1 − 25
par .3 − 52 =
3.5.5 3-8* Other Ramps
3-80 Jog Ramp Time
Range: Function:
Size [1 - Enter the jog ramp time, i.e., the acceleration/
related 3600 deceleration time between 0 RPM and the
*
s] rated motor speed (n
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 × nnom par . 1 − 25
jog speed par . 3 − 19
®
VLT AQUA Drive Programming Guide
tacc × nnom par . 1 − 25
s
ref rpm
s
ref rpm
) (set in 1-25 Motor
M,N
s
®
MG20O622 - VLT is a registered Danfoss trademark
RPM
P 4-13 RPM
high limit
P 1-25
Motor speed
P 3-19
Jog speed
P 4-11 RPM
low limit
t jog
P 3-80
Ramp up
(acc)
Figure 3.17
3-84 Initial Ramp Time
Range: Function:
0 s [0 - Enter the initial ramp-up time from zero speed to
*
60 s] Motor Speed Low Limit, 4-11 Motor Speed Low
Limit [RPM] or 4-12 Motor Speed Low Limit [Hz].
Submersible deep well pumps can be damaged by
running below minimum speed. A fast ramp time
below minimum pump speed is recommended.
This parameter may be applied as a fast ramp rate
from zero speed to Motor Speed Low Limit. See
Figure 3.18.
Speed
Motor Speed
High
Normal
Ramps
Motor Speed
Low
Initial
Ramp
Figure 3.18 Initial and Final Ramp Time
3-85 Check Valve Ramp Time
Range: Function:
0 s [0 - In order to protect ball check valves in a stop
*
60 s] situation, the check valve ramp can be utilized as a
slow ramp rate from 4-11 Motor Speed Low Limit
[RPM] or 4-12 Motor Speed Low Limit [Hz], to Check
Valve Ramp End Speed, set by the user in
3-86 Check Valve Ramp End Speed [RPM] or
3-87 Check Valve Ramp End Speed [HZ]. When
3-85 Check Valve Ramp Time is different from 0
seconds, the Check Valve Ramp Time is effectuated
and will be used to ramp down the speed from
3
t jog Time
P 3-80
Ramp down
(dec)
Final
Ramp
Time
3-35
3