Danfoss VLT HVAC Drive FC 102 Programming Guide

Parameter 3-42 Ramp 1 Ramp Down Time
Table 224: Parameter 3-42 Ramp 1 Ramp Down Time
3-42 Ramp 1 Ramp Down Time
Default value: Size related
Parameter type: Range, 0.01 - 3600 s
Setup: All setups
Conversion index: -2
Data type: Uint32
Change during operation: True
Enter the ramp-down time, that is the deceleration time from the synchronous motor speed n
s
to 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. The value 0.00 corresponds to 0.01 s in speed mode. See ramp-
up time in parameter 3-41 Ramp 1 Ramp Up Time.
Par . 3 − 42 = 
tdec s  × ns RPM
ref RPM
Parameter 3-45 Ramp 1 S-ramp Ratio at Accel. Start
Table 225: Parameter 3-45 Ramp 1 S-ramp Ratio at Accel. Start
3-45 Ramp 1 S-ramp Ratio at Accel. Start
Default value: 50%
Parameter type: Range, 1 - 99%
Setup: All setups
Conversion index: 0
Data type: Uint8
Change during operation: True
Enter the proportion of the total ramp-up time (parameter 3-41 Ramp 1 Ramp Up Time) in which the acceleration torque increases.
The larger the percentage value, the greater the jerk compensation achieved, and thus the lower the torque jerks occurring in the
application.
Parameter 3-46 Ramp 1 S-ramp Ratio Accel. End
Table 226: Parameter 3-46 Ramp 1 S-ramp Ratio at Accel. End
3-46 Ramp 1 S-ramp Ratio at Accel. End
Default value: 50%
Parameter type: Range, 1 - 99%
Setup: All setups
Conversion index: 0
Data type: Uint8
Change during operation: True
Enter the proportion of the total ramp-up time (parameter 3-41 Ramp 1 Ramp Up Time) in which the acceleration torque decreases.
The larger the percentage value, the greater the jerk compensation achieved, and thus the lower the torque jerks in the application.
Parameter 3-47 Ramp 1 S-ramp Ratio at Decel. Start
Table 227: Parameter 3-47 Ramp 1 S-ramp Ratio at Decel. Start
3-47 Ramp 1 S-ramp Ratio at Decel. Start
Default value: 50%
Parameter type: Range, 1 - 99%
Setup: All setups
Conversion index: 0
Data type: Uint8
Change during operation: True
Enter the proportion of the total ramp-down time (parameter 3-42 Ramp 1 Ramp Down Time) where the deceleration torque increa-
ses. The larger the percentage value, the greater the jerk compensation achieved, and thus the lower the torque jerks in the applica-
tion.
Parameter 3-48 Ramp 1 S-ramp Ratio at Decel. End
Table 228: Parameter 3-48 Ramp 1 S-ramp Ratio at Decel. End
3-48 Ramp 1 S-ramp Ratio at Decel. End
Default value: 50%
Parameter type: Range, 1 - 99%
Setup: All setups
Conversion index: 0
Data type: Uint8
Change during operation: True
AU275636650261en-000101 / 130R0334144 | Danfoss A/S © 2022.12
Parameter Descriptions
VLT AutomationDrive FC 301/302
Programming Guide

Danfoss VLT HVAC Drive FC 102 Specifications

General

Enclosure	IP20, IP21, IP55
Ambient Temperature Range	-10°C to +40°C
Storage Temperature Range	-25°C to +70°C
Relative Humidity	5-95% (non-condensing)
Communication Protocols	Modbus RTU, BACnet, Profibus
Certifications	CE, UL, cUL
Control Principle	PWM
Cooling Method	Forced air cooling
Input Voltage	200-240V, 380-480V, 525-600V
Control Modes	sensorless vector control, closed loop vector control