Danfoss VLT FC 103 Programming Manual page 54

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 deceleration
related [ 1.00 time from 1-25 Motor Nominal Speed to 0 RPM.
*
- 3600 Choose a ramp-down time such that no over-
s] voltage 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
Configure parameters for special ramps e.g. Jog.
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 Refrigeration Drive Programming Guide
tacc × nnom par . 1 − 25
s
ref rpm
s
ref rpm
) (set in 1-25 Motor
M,N
s
®
MG16H102 - 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)
Illustration 3.16
3-81 Quick Stop Ramp Time
Range: Function:
Size [1 - Enter the quick–stop ramp-down time, i.e.
related 3600 s] 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
Illustration 3.17
t Qstop s x n s RPM
Par . 3 − 81 =
jog ref ( par . 3 − 19 ) RPM
Δ
3
t jog Time
P 3-80
Ramp down
(dec)
Time
P 3-81
Qramp
Qstop
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