FMI SCST-01 User Manual
"SCST-01" STEP MOTOR
CONTROL KIT
http://www.fmipump.com
OPERATION INSTRUCTIONS
New FMI Step Motor Control Kit “SCST-01”
Congratulations! Your FMI Step Motor Control Kit SCST-01 is a complete control
package designed specifically for FMI pumps with step motors. It’s small in size but big
in performance and provides a quick method to run your pump today.
Quick Start Instructions
Your controller is initially set to provide 320 strokes/minute or 150 strokes/minute.
Dispense and other speed settings are easily set by following the detailed instructions
on the following pages.
1. Connect harness J1 & J2 to appropriate connectors on board. The black and white
wires from J1 connect to the power supply. White (or black with white lettering) is the
positive lead while solid black is negative.
*Connect DIP Switch Assembly to Header J3 (Pin 1 to red stripe)
DO NOT TURN POWER ON
2. Connect motor wires to terminal block J1 according to the following chart:
Table1.
Screw Terminal
Color
Motor Lead Color for Standard
STRH/STH/STQ/SQ pumps
Motor Phase Motor P/N 110746
(NEMA 23 Frame)
Motor P/N 110745
(NEMA 17 Frame)
STRH/STH/STQ/SQ
Duplex
Motor P/N 300615
(NEMA 23Frame)
Yellow A Yellow and Black Yellow Orange & White w/Black
Stripe
Red A Red and White Red Black & White w/Orange
Stripe
Brown B Blue and Orange Orange Yellow & White w/Red Stripe
Orange B Green and Brown Blue Red & White w/Yellow
Stripe
3. Connect pump sensor leads to J2 according to color i.e. Red to Red, etc.
4. Turn on power and pump will start running at factory setting. Note: See 4.1 page 6.
*Basic Boards use jumper pin connector shunts instead of DIP switch.
1.0 Description
IN-SCST-01-10 1
"SCST-01" STEP MOTOR
http://www.fmipump.com
OPERATION INSTRUCTIONS
The SCST-01 is a self-contained step motor controller specifically designed for use with
Fluid Metering pumps. It contains its own step drivers and can be set to several run
modes utilizing either internal or external controls.
1.1 Features
• Pre-set Run Modes
• Multiple Control Methods: PLC, Relay, 0-5 VDC, or Manually by shunt
• Dispense, Run
• Sensor Enable/Disable
• Switchable Forward/Reverse of Motor Direction
2.0 Run Modes
The SCST-01 step motor controller can be used to drive any FMI stepper driven (STH,
STQ) pumps in any of the following modes.
2.1 Continuous (Constant Run) Mode
Your Kit comes factory set for 320 or 150 spm (strokes per minute). Speed is easily
adjustable using shunt connectors on Speed Header J3 (fig. 1) or DIP Switch Assembly.
Speed is adjustable using Pins (Switch) 1-7 and binary addition according to the
following chart and diagram or by 0-5 VDC input (Section 2.4).
Figure 1
Switch
/ Pin Speed
SPEED HEADER - J3
Dispense Pins/ Switches
Speed or rpm Pins/ Switches
CONTROL KIT
1 =
2 =
3 =
4 =
5 =
6 =
7 =
10 rpm
20 rpm
40 rpm
80 rpm
160 rpm
320 rpm
640 rpm
2.2 Dispense Mode
The system will allow you to dispense from 1 to 7 shots per signal (momentary switch
closure on J2). The number of shots per signal is set by shunting pin/Switches sets 911 on Header J3.
Pin/Switch No.= # of shots Example
IN-SCST-01-10 2
"SCST-01" STEP MOTOR
http://www.fmipump.com
OPERATION INSTRUCTIONS
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.
Typical wiring is as follow: With FMI Motors
CONTROL KIT
OPTICALLY ISOLATED
2
E
C
2N3904
B
1
4N35
6
5
4
J2 PIN 7
J2 PIN 8
DIRECTLY COUPLED
E
C
0.01mF
2N2222
* R
*R=10 k (for reference only, your specific
application "value" may need adjusting.
B
[SIGNAL IN]
[GROUND]
5 V DC
(J2 PIN 9)
[GROUND]
(J2 PIN 7)
(J2 PIN 8)
150 OHM
1 K OHM
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).
IN-SCST-01-10 3
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