FMI SCST-01 - Manual (Page 3)

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"SCST-01" STEP MOTOR
CONTROL KIT
OPERATION INSTRUCTIONS
IN-SCST-01-10 3
Pin 9 = 1 Pin 9 + Pin 11 = 1 + 4 = 5 shots
Pin 10 = 2
Pin 11= 4
2.21 Actuation For Dispense
Dispense Actuation is handled by Pins 3 & 4 on the J2 Terminal Block by providing a
momentary contact (switch closure, PLC, Relay, Mechanical Timer) of the 2 yellow
wires. The minimum closure time that this input can see is 30 milliseconds (0.030 sec).
DO NOT APPLY ANY VOLTAGE to this input!
2.3
Timed/Count Dispense (Pin Shunt use only)
The pump will begin dispensing until both pins of pin set 9 on J3 are shorted together.
This will cause the pump to stop. Pin set 9 can be shorted by using any counter or
timer that can control a SPST type relay or switch closure. External counters can tap
pin 8 on J2 to sense the count pulse.
* R
2N2222 B
C E
[GROUND]
[SIGNAL IN]
J2 PIN 7
J2 PIN 8
0.01mF
DIRECTLY COUPLED
*R=10 k (for reference only, your specific
application "value" may need adjusting.
150 OHM
2N3904
B
C E
(J2 PIN 7)
(J2 PIN 8)
[GROUND]
5 V DC
(J2 PIN 9)
1 K OHM
6
5
4
2
1
4N35
OPTICALLY ISOLATED
Typical wiring is as follow: With FMI Motors
2.4
External Control 0-5 VDC - Voltage Following Input
In order for the stepper controller board to recognize and accept a 0-5 VDC control input
all shunts on pins 1-7 (header J3) must be removed or Switched off. The board will not
respond to a voltage input if any of the speed select pins have a shunt across them.
Once the shunts on all pins are removed, a DC voltage signal may be applied to header
J2 pins 1 and 2 and a variation of that voltage will linearly vary the motor speed.
Maximum speed using a 0-5 VDC input signal is limited to 1200 rpm, depending on the
application. For duplex motor P/N 300615, the max speed is 150rpm.
3.0 Input
Headers
The SCST-01 step motor controller has several different input/output header sections
for control and interface with the stepper motor. A diagram showing the placement of
these headers can be found in Figure 2.
A single 24VDC power supply delivering 1.25A (min) of current is required for
driving any of the standard Fluid Metering step motors (inputs 1 and 2 on Header
J1).