ABB ACS250 Technical Instruction

Technical instruction
ACS250 micro drives, 110-480 V
Remote push button speed control
Overview
For some applications it can be preferable to control the
speed of a motor by increasing and decreasing speed using
push button controls mounted on a control panel or operator
station, sometimes referred to as digital potentiometer speed
control. This techincal instruction describes two examples of
how this can be implemented on the ACS250.
Solution one wiring diagram
The following circuit uses a standard single pole switch
for start and stop control with momentary push buttons to
increase and decrease speed.
Optional
control lock-off
Run/Stop
Speed up
Speed down
(Optional)
Fwd/Rev
Solution one operation
The optional lock-off provides a useful feature which stops
operation of all of the other input functions and prevents
operation of the drive when in the open position. It could be
1 +24 V output
2 Digital input 1
3 Digital input 2
4 Digital input 3
5
Digital input 4
6
7
provided as a key switch or a lock-off on the control panel.
The start mode for the drive is set to edge triggered so that
the start input must always be applied after the control lock-
off is disabled (closed). This input should not be used as a
safety related input for the application. In the event of any
safety related issues the drive should be fully isolated from
the mains supply.
The run/stop input provides a run command to the drive
when the switch is in the closed position and a stop when the
switch is open.
The speed up and speed down are momentary push buttons
that are held in to increase or decrease the speed reference
to the drive.
The fwd/rev switch is optional depending on whether bi-
directional (forward and reverse) motor rotation is required.
The drive operates in the forward direction when the switch is
open and reverses when the switch closes.
Solution one parameter set up
The drive should be defaulted back to factory settings prior
to set up. The following parameters are set within the drive to
activate the functionality shown in the control diagram. Check
all parameters have been set correctly prior to enabling the
drive.