Commissioning via the built-in BOP
5.6 Function commissioning
SINAMICS V20 Converter
Operating Instructions, 10/2019, A5E34559884-012
103
5.6.2.6 Setting the ramp time
Functionality
The ramp-function generator in the setpoint channel limits the speed of setpoint changes.
This causes the motor to accelerate and decelerate more smoothly, thereby protecting the
mechanical components of the driven machine.
Setting ramp-up/down time
● The ramp-up and ramp-down time can be set respectively in P1120 and P1121.
● When the required ramp-up or ramp-down time exceeds the maximum value of P1120 or
P1121, you can expand the maximum value by using a scaling factor specified in P1138
or P1139. In this case, calculate the ramp-up or ramp-down time as follows:
– Ramp-up time = P1120 * P1138
– Ramp-down time = P1121 * P1139
Setting parameters
P1082[0...2] Maximum frequency [Hz] This parameter sets maximum motor frequency at which motor will run
irrespective of the frequency setpoint.
Range: 0.00 to 550.00 (factory default: 50.00)
P1120[0...2] Ramp-up time [s] This parameter sets the time taken for motor to accelerate from standstill
up to maximum motor frequency (P1082) when no rounding is used.
Range: 0.00 to 650.00 (factory default: 10.00)
P1121[0...2] Ramp-down time [s] This parameter sets the time taken for motor to decelerate from maximum
motor frequency (P1082) down to standstill when no rounding is used.
Range: 0.00 to 650.00 (factory default: 10.00)
P1138 Ramp-up time scaling factor This parameter sets the scaling factor for the ramp-up time.
Range: 1.00 to 10.00 (factory default: 1.00)
P1139 Ramp-down time scaling factor This parameter sets the scaling factor for the ramp-down time.
Range: 1.00 to 10.00 (factory default: 1.00)
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