INSTALLATION
17
replaced by externally wired, remote potentiometers - see Figure 8.
These external controls can be used to give a machine operator
remote control of the motor.
Clockwise rotation of the ACCEL potentiometer increases the rate of
motor ramp up to a maximum possible figure of 500 rps
2
. The
ACCEL potentiometer can not be replaced by an external variable
resistor.
Optional Advance
Rate Pot and
Switch Connections
Figure 8 shows typical external connections required when using the
internal clock source. External variable resistance values of 100K
Ω
for Slow and 10K
Ω
for Fast are recommended.
When using external speed controls, turn switch 3 off in order to
isolate the internal potentiometers.
Optional
Fast Adj.
10K
Ω
Slow Run
Fast Run
Direction
Sh
560
Ω
Optional
Slow Adj.
100K
Ω
1
14
13
25
Note: Screened cable should be used (maximum length 2 metres)
Figure 8. Signal Connections
Input Circuits
The Step, Direction and Shutdown inputs are configured as
differential TTL compatible opto-isolated inputs with reverse polarity
protection. Figure 9 shows details of the input circuits used.
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