Setting The Dual Ramp Function - Siemens SINAMICS V20 Series Operating Instructions Manual

5.6.3.16

Setting the dual ramp function

Functionality
The dual ramp function allows the user to parameterize the inverter so that it can switch from
one ramp rate to another when ramping up or down to a setpoint. This may be useful for
delicate loads, where starting to ramp with a fast ramp-up or ramp-down time may cause
damage. The function works as follows:
Ramp up:
● Inverter starts ramp-up using ramp time from P1120
● When f_act > P2157, switch to ramp time from P1060
Ramp down:
● Inverter starts ramp-down using ramp time from P1061
● When f_act < P2159, switch to ramp time from P1121
Note that the dual ramp algorithm uses r2198 bits 1 and 2 to determine (f_act > P2157) and
(f_act < P2159).
SINAMICS V20 Inverter
Operating Instructions, 07/2012, A5E03728167
Commissioning
5.6 Function commissioning
103