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Chapter 2 - Start-Up Instructions
IV F
2 - 22
DCS 600 Operating Instructions
2.7 Balancing the speed controller, plus fine-balancing the EMF
The balancing procedure indicated below assumes that the coupled load will with-
stand speed jumps. If this is not allowed for the load, a different setting of the listed
parameters will be required.
Reference values switching over between the internal potentiometers POT1 and POT2
(Parameters
17.01
and
17.02
) will be used for balancing the controllers. Parameter
PERIOD
17.03
defines the period of switch-over; value 1 corresponds to 10 msec.
15.02 = 9
Switch-over of reference value for the speed controller, also suitable for the EMF
controller.
17.04 = SQWAVE
Selection of the reference value switching over between POT1 and POT2.
22.01 = 0,1 s
Ramp-up time of ramp-function generator
22.02 = 0,1 s
Ramp-down time of ramp-function generator
Adjusting the potentiometers for speed controller balancing:
During acceleration/ braking, the drive should reach the current limitation, if necessary
increase the value of POT1.
Scaling of
17.01
and
17.02
⇒
20 000 corresponds to 100 % speed.
17.01
(POT1)
=
10%...20%
max. speed
17.02
(POT2)
=
0
17.03
(PERIOD) =
Adapt as necessary.
Switch ON power; start drive.
DANGER
: System components now energized!
Drive should run at speed values corresponding to POT1 and “0”.
For assessing control quality, the figure below can be used.
Oscillograph speed feedback via D/A output, or if one is to hand, use program DRIVES
WINDOW to depict it via the Monitor menu and Parameter
1.04
.
t
A
B
C
D
E
F
Fig.: Transient response of controller
A: reference value jump
B: undercompensated; reset time and P-gain too small
C: undercompensated; P-gain too small
D: normal
E: slightly overcompensated; when a higher dynamic response is required
F: overcompensated; short reset time and a high P-gain
Содержание DCS 600 MultiDrive Series
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