25A Series
A-9
TEST POINTS FOR POTENTIOMETERS:
See section “G”
SET-UP:
See section “G” for engineering and installation notes.
OPERATING MODE SELECTION:
These modes can be selected by the DIP-switches according to the chart in the functional block diagram:
•
Current Mode
•
Voltage Mode
•
IR Compensation Mode
*
•
Tachometer Mode
APPLICATION NOTES:
*
For IR compensation mode, a resistor must be added to location R8*. See the functional block diagram above and
section “G” for more information. The combination of the resistor addition and the switches set for voltage mode will
configure the amplifier for IR compensation mode. See section "G" for more information.
See section G for more information on analog position loop mode.
CURRENT LIMIT ADJUSTMENTS:
These amplifiers feature separate peak and continuous current limit adjustments.
The current limit adjusting Pot 2 adjusts both peak and continuous current limit at the same time. It has 12 active turns
plus 1 inactive turn at each end and is approximately linear. Thus, to adjust the current limit, turn the potentiometer fully
counter-clockwise, then turn clockwise to the appropriate value. If the desired limit is, for example, 10 amperes, and the
servo amplifier peak current is 20 amperes, turn the potentiometer 7 turns clockwise from the fully counter-clockwise
position.
Pin P1-9 is the input to the internal current amplifier stage. Since the output current is proportional to P1-9, the adjusted
current limit can easily be observed at this pin. Note that a command signal must be applied to the reference inputs to
obtain a reading on P1-9. The maximum peak current value equals 7.25 V at this pin and the maximum continuous
current value equals 3.63 V at this pin.
The actual current can be monitored at pin P1-8.
The continuous current can be reduced without affecting the peak current limit by connecting an external current limiting
resistor R-lmt between P1-10 and P1-2. See table below.
Current Limit Resistor (
Ω
)
15K
6.6K
3.4K
2.1K
1.2K
810
500
250
0
Continuous Current Limit %
90 %
80 %
70 %
60 %
50 %
40%
30 %
20 %
10 %
TYPICAL SYSTEM WIRING:
See section "G".
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