Danfoss VLT 2010 Manual page 44

External Manual Control Over-ride
It is often necessary to run the machine manually for
maintenance reasons.
Manual control can be carried out manually from the
keypad of all the units.
If remote control of the manual over-ride is required
additional circuitry is necessary.
For the VLT Series 3500 special parameters are available
for external manual over-ride. Refer to the VLT Series
3500 instruction manual.
The following circuit and instructions for external manual
over-ride relates to the VLT Series 3000. The proposed
control scheme is based on using 2 of the 4 menu set-
ups. Menu set-up 1 has the parameters set for PI
operation and Menu set-up 2 has the parameters set for
manual control.
1. Set parameter 001 to multi set-up.
2. Set parameter 400 to select set-up.
3. Install an "Auto-Manual" switch across terminals 12 &
16. This will allow selection between the 2 menu set-
ups. The bottom right hand corner of the display will
show the menu set-up you are in.
4. Program menu set-up 1 for PI operation.
5. Select menu set-up 2 and alter the following
parameters:
• Parameter 100; Set to the same load type as in
menu 1. You can check the parameter data in menu
2 against the parameter data in menu 1 by switching
between menu set-ups while you are in that
parameter.
• Parameter 107-113; Set to the same load types as
in menu 1.
• Parameter 201-201; Max. and Min. Frequency can
be set to suit manual control.
• Parameter 209; Set to the same load type as in
menu 1.
• Parameter 215-216; Set the ramp times to suit the
application.
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Appendix; PI Regulation
• Parameter 315; Set the motor thermal overload
protection to trip 2.
• Parameter 412; Set to 0-10 V.
• Parameter 413; Set to no operation.
External Manual Control Over-ride
12
Auto
Link
27
16
18
50
53
55
55
60
VLT control terminals
NOTE: All control wiring needs to be
shielded and the shield grounded to
the clamps as shown in the respective
instruction manuals.
Manual
Start/Stop
Par: 402
(start)
Manual control
+
potentiometer.
1 kOhm wire wound.
Internal
–
setpoint
Par: 205
–
+
0/4-20 mA transmitter
parameter 413 (0/4-20mA)
45