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MVE User Manual (710-17074-00G) |
39
Timed Voltage Ramp
Timed voltage ramp (TVR) soft starting ramps the application of voltage to the motor over a defined time period. The voltage ramp
reduces the initial starting torque and slows the motor's rate of acceleration.
TVR starting can be useful for applications where multiple motors of different sizes are connected in parallel, and/or the loads are
not mechanically linked.
NOTE
TVR soft starting is not suitable for high inertia loads (such as fans), which require a high level of voltage to accelerate
the load.
NOTE
For multiple motors of the same sizes, and/or mechanically coupled loads, use constant current starting.
For a timed voltage ramp start, the following are typical values and can be adjusted to suit your specific application:
1.
Add the FLC value of all the connected motors. Use this combined value to set parameter 1A
Motor Full Load
Current
. (Note that the combined value must not exceed the starter rating.)
2.
Set parameter 2C
Initial Current
to 100%, parameter 2D
Current Limit
to 600% and set the ramp time as required
(parameter 2B
Start Ramp Time
).
3
1
2
6
5
4
09294.
B
1:
Initial Current
(parameter 2C)
2:
Current Limit
(parameter 2D)
3:
Start Ramp Time
(parameter 2B)
4: Full voltage
5: Motor 1 current
6: Motor 2 current
Time
