Danfoss VLT HVAC Series User Manual

3.5.4 3-5* Ramp 2
Choosing ramp parameters, see 3-4*.
3-51 Ramp 2 Ramp-up Time
Range: Function:
10.00 s* [1.00 - 3600.00 s] Enter the ramp-up time, i.e., the acceleration time from 0 RPM to par.1-25 Motor Nominal Speed .
Choose a ramp-up time such that the output current does not exceed the current limit in par.
4-18
Current Limit during ramping. See ramp-down time in par.3-52 Ramp 2 Ramp-down Time .
par . 3 − 51 =
tacc × nnorm par . 1 − 25
ref rpm
s
3-52 Ramp 2 Ramp-down Time
Range: Function:
20.00 s* [1.00 - 3600.00 s] Enter the ramp-down time, i.e., the deceleration time from par.1-25 Motor Nominal Speed to 0 RPM.
Choose a ramp-down time such that no overvoltage arises in the inverter due to regenerative op-
eration of the motor, and such that the generated current does not exceed the current limit set in
par.4-18
Current Limit . See ramp-up time in par.3-51 Ramp 2 Ramp-up Time .
par .3 − 52 =
tdec × nnorm par . 1 − 25
ref rpm
s
3.5.5 3-8* Other Ramps
Configure parameters for special ramps such as jog or quick stop, for example.
3-80 Jog Ramp Time
Range: Function:
20.00 s* [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 par.1-25 Motor Nominal Speed ). Ensure that the resultant output current re-
quired for the given jog ramp time does not exceed the current limit in par.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
jog speed par . 3 − 19
s
3 Parameter Description VLT
®
HVAC Drive Programming Guide
3-38 MG.11.C6.22 - VLT
®
is a registered Danfoss trademark
3

Danfoss VLT HVAC Series Specifications

General

Protection Features	Overcurrent, Overvoltage, Undervoltage, Overtemperature, Short circuit
Communication Interfaces	Profibus, Ethernet
Cooling Method	Forced convection
Ambient Temperature	-10°C to +40°C
Enclosure Rating	IP20, IP21, IP55
Output Voltage	0 - 100% of supply voltage