Danfoss VLT FC 102 Programming Manual page 81

Parameter Descriptions
3-41 Ramp 1 Ramp Up Time
Range: Function:
Size [ 1.00 - 3600 Enter the ramp-up time, that is the
related s] acceleration time from 0 RPM–
*
parameter 1-25 Motor Nominal
Speed. Select a ramp-up time such
that the output current does not
exceed the current limit in
parameter 4-18 Current Limit during
ramping. See ramp-down time in
parameter 3-42 Ramp 1 Ramp Down
Time.
par . 3 − 41 =
3-42 Ramp 1 Ramp Down Time
Range: Function:
Size [ 1.00 - 3600 Enter the ramp-down time, that is
related s] the deceleration time from
*
parameter 1-25 Motor Nominal
Speed–0 RPM. Select a ramp-down
time preventing overvoltage from
arising in the inverter due to
regenerative operation of the
motor. The ramp-down time should
also be long enough to prevent
that the generated current exceeds
the current limit set in
parameter 4-18 Current Limit. See
ramp-up time in
parameter 3-41 Ramp 1 Ramp Up
Time.
par . 3 − 42 =
3.5.4 3-5* Ramp 2
To select ramp parameters, see parameter group 3-4* Ramp
1.
3-51 Ramp 2 Ramp Up Time
Range: Function:
Size [ 1.00 - 3600 Enter the ramp-up time, that is the
related s] acceleration time from 0 RPM–
*
parameter 1-25 Motor Nominal
Speed. Select a ramp-up time such
that the output current does not
exceed the current limit in
parameter 4-18 Current Limit during
ramping. See ramp-down time in
parameter 3-52 Ramp 2 Ramp Down
Time.
par . 3 − 51 =
M0010001
Programming Guide
tacc × nnom par . 1 − 25
s
ref RPM
tdec × nnom par . 1 − 25
s
ref RPM
tacc × nnom par . 1 − 25
s
ref rpm
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3-52 Ramp 2 Ramp Down Time
Range: Function:
Size [ 1.00 - 3600 Enter the ramp-down time, that is
related s] the deceleration time from
*
parameter 1-25 Motor Nominal
Speed–0 RPM. Select a ramp-down
time such that no overvoltage
occurs in the inverter due to
regenerative operation of the
motor, and such that the generated
current does not exceed the current
limit set in parameter 4-18 Current
Limit. See ramp-up time in
parameter 3-51 Ramp 2 Ramp Up
Time.
par . 3 − 52 =
3.5.5 3-8* Other Ramps
3-80 Jog Ramp Time
Range: Function:
Size [1 - 3600 s] Enter the jog ramp time, that is the
related acceleration/deceleration time
*
between 0 RPM and the nominal
motor speed (n
parameter 1-25 Motor Nominal
Speed). Ensure that the resulting
output current required for the
given jog ramp time does not
exceed the current limit in
parameter 4-18 Current Limit. The
jog ramp time starts after activating
a jog signal via the control panel, a
selected digital input, or the serial
communication port.
par . 3 − 80 =
t jog × nnom par . 1 − 25
jog speed par . 3 − 19
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)
Illustration 3.22 Jog Ramp Time
tdec × nnom par . 1 − 25
s
ref rpm
) (set in
M,N
s
t jog Time
P 3-80
Ramp down
(dec)
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