Control Techniques M'Ax 403 User Manual page 111

Example
Parameter
4.15 Motor – thermal time-constant
4.07 Symmetrical current limit Kc1
4.24 Symmetrical current limit Kc2
4.28 Symmetrical current limit Kc3
Process cycle time
Gain sequencing using all three PID-gains buffers
1. Set 4.53 Symmetrical current limit after motor thermal-overload
alarm at 200 (the largest of the symmetrical current limit values).
2. Set 4.54 Thermal-overload time to trip at 12 (process cycle time,
rounded-up to nearest integer).
3. Calculate the following:
105
æ
[ ] ×
t 4.15 In 1 ------------------ -
= – –
c
ç
[
4.53
è
2
105
æ ö
×
----------- -
t = – 89 In 1 – =
c
ç ÷
2
200
è ø
4. Calculate the following:
[ ]
t t 4.54 28.7 12
= – = –
D C
5. Calculate the following:
t –
[ ] [ ] ×
4.52 = 4.53 1 e –
– (
16.7
[ ] [ ] ×
4.52 = 200 1 e –
6. Enter the calculated value into 4.52 .
7. Perform the following, as appropriate:
Version _AN
Initiate the save operation by setting parameter XX.00 at 1000 .
Execute the operation by performing either of the following:
• While the display is in Edit mode, press at the same time:
and
• Set parameter 10.38 at 100 (via serial communications)
Version _SL
Version _AN (if required)
Ensure the Drive is disabled by checking that the Hardware enable
contact is open or that parameter 6.15 is set at 0 , then perform either
of the following:
• Initiate the store operation by setting parameter 0.50 at 2 ( Prog ).
Execute the operation by setting parameter 10.38 at 100 .
Set 11.67 Flash update enable at 1 .
M'Ax User Guide
Issue Number: 4
Value
89
150
200
175
11.5s
2
ö
÷
2
]
ø
28.7 s ( )
16.7 s ( )
=
⁄
[ ]
4.15
D
) 89 ⁄
(%)
= 82.7
*
105