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Sigma II User's Manual
Using the /P-CON Signal
ð Input P-CON CN1-41
The /P-CON input signal switches the Speed Control Mode from PI (proportional-
integral) to P (proportional) control.
Proportional control can be used in the following two ways:
•
When operation is performed by sending speed references from the host control-
ler to the servo amplifier, the host controller can selectively use P control mode
for particular conditions only. This method can prevent the occurence of over-
shoot and also shorten settling time.
•
If PI control mode is used when the speed reference has a reference offset, the
motor may rotate at a very slow speed and fail to stop even if 0 is specified as a
speed reference. In this case, use P control mode to stop the motor.
5.2.2
Position Reference
The reference pulse, reference code, and clear inputs are used for the position refer-
ence. Since this signal can be used in different ways, set the optimum reference
input for the system created.
n
Reference by Pulse Input
Positioning is controlled by inputting a move reference pulse.
Any of the following forms can be used for the position reference:
•
Line-driver output
•
+12V open-collector output
•
+5V open-collector output
Connection Example 1: Line-driver Output
Applicable line driver: SN75174 manufactured by Texas Instruments Inc., MC3487
Proportional Control Reference
PULS
Reference
P
/PULS
pulse input
SIGN
Reference
P
/SIGN
code input
CLR
Clear input
P
/CLR
P represents twisted pair wires
5-16
Chapter 5: Parameter Settings and Functions
Speed Control,
Position Control
Servo Amplifier
Photocoupler
CN1-7
CN1-8
CN1-11
CN1-12
CN1-15
CN1-14
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