Technical information

8 – THEORY OF OPERATION
Acceleration Control
125
8.3.6 Dual Acceleration Ramp Control
General
Two independent current ramps and kick currents may be programmed. The use of two different
starting profiles can be very useful with applications that have varying starting loads such as
conveyors that can start either loaded or unloaded.
The Current Ramp 1 profile is programmed using the parameters Initial Current 1, Maximum Current
1, and Ramp Time 1. The Current Ramp 2 is programmed using the parameters Initial Current 2,
Maximum Current 2, and Ramp Time 2. Kick Current 1 profile is programmed using the parameters
Kick Level 1 and Kick Time 1. Kick Current 2 profile is programmed using the parameters Kick
Level 2 and Kick Time 2.
Acceleration Ramp Selection Current Ramp 2 and Kick Current 2 starting profiles are selected by programming a digital input to
the Ramp Select function and then energizing that input by applying 120 Volts to it. When a digital
input is programmed to Ramp Select, but de-energized, Current Ramp 1 and Kick Current 1 are
selected. When no digital inputs are programmed to the Ramp Select function the Ramp 1 profile is
used.
The Ramp Select input only affects the starting profile when using a current ramp profile and during
a kick. The Ramp Select input does not affect the TruTorque ramp, Power ramp, or the Voltage ramp
profile (unless kicking is enabled at the beginning of those ramps).
The following table summarizes which parameters affect the starting profile when a digital input is
programmed to the Ramp Select function and that input is either energized or de-energized.
Ramp Select De-energized Ramp Select Energized
Initial Current 1 Initial Current 2
Maximum Current 1 Maximum Current 2
Ramp Time 1 Ramp Time 2
Kick Level 1 Kick Level 2
Current Ramp
Kick Time 1 Kick Time 2
Initial Voltage/Torque/Power
Maximum Torque/Power
Ramp Time 1
Kick Level 1 Kick Level 2
TruTorque Ramp
Kick Time 1 Kick Time 2
Initial Voltage/Torque/Power
Maximum Torque/Power
Ramp Time 1
Kick Level 1 Kick Level 2
Power Ramp
Kick Time 1 Kick Time 2
Initial Voltage/Torque/Power
Ramp Time 1
Kick Level 1 Kick Level 2
Voltage Ramp
Kick Time 1 Kick Time 2