7.8 Slow speed
Slow speed is an individual function, or a pre-start
function to run the motor with low voltage output. This
feature can, for example, be used to position a traverse or
millband.
This function can be operated via the HMI, IO or fieldbus.
Slow speed has four pre-defined speeds:
• Fast jog
• Jog
• Creep
The motor strength can be adjusted with separate
parameters. Choose a suitable value for the application.
INFORMATION
Too high value of the motor strength could cause
oscillations and if too low the motor may not start.
It is possible to run the motor in both the forward and
reverse direction, with different slow speed speeds in both
directions.
When a Slow speed signal is given, the motor will
accelerate up to a constant speed, that is slower than
the nominal speed, for as long as the slow speed
signal remains active. When the Slow speed signal is
deactivated, the softstarter immediately cuts the voltage
applied to the motor and the motor stops.
For navigation, see chapter 6.2.4 Motor Jog
Slow speed is configured with the following
parameters:
Parameter Description Setting range Default value
02.07 Pre-start function Set to Slow speed forward or Slow speed
reverse.
Off, Motor
heating, Stand
still brake, Jog
forward, Jog
backward
Off
02.08 Pre-start time Sets the duration of the pre-start function. 0.0 ... 7200.0 s 10.0 s
06.01 Slow speed forward Sets the Slow speed forward. Fast jog forward is
33%, Jog forward is 15 % and Creep forward is
8 % of the nominal motor speed.
Fast jog, Jog,
Creep
Jog
06.02 Slow speed forward strenght Parameter related to the torque that is
generated during Slow speed in the forward
direction.
10 ... 100% 50%
06.03 Slow speed reverse Sets the Slow speed reverse. Fast jog reverse is
33%, Jog reverse is 20 % and Creep reverse is
9 % of the nominal motor speed.
Fast jog, Jog,
Creep
Jog
06.04 Slow speed rev strength Parameter related to the torque that is
generated during Slow speed in the reverse
direction.
10 ... 100% 50%
7
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