FMI STH/Q - Manual (Page 2)

2.3 Step Motors:
FMI ST pumps are supplied with a 17 or a 23
frame Motors.
For wiring diagram and detailed motor
specifications go to the literature section of our
website at www.fluidmetering.com/literature.html
2.4 Rotational Sensor: FMI STH and
STQ standard pumps are supplied with an LED
rotational sensor. For wiring diagram and sensor
details see Figure G .
2.4.1 For sensor use with FMI SCST-01 Step
Motor Controller. See SCST-01 instructions.
2.5 STH Pump Homing: Best dispensing
performance of the pump is obtained by proper set
up of the start/stop position of the piston relative
to the intake port of the pump housing.
Positioning of the piston flat so that it directly faces
the inlet port is termed “homing”.
The images below show the home position for a
pump which has been set up to turn clockwise.
In this case the inlet port is on the left.
If a particular application calls for the inlet port to
be on the right, the pump will be programmed to turn
counterclockwise and the figures bellow must be
reversed.
2.6 Park Position: Preventive maintenance
steps in order to minimize the possibility of a
frozen pump or seize condition are as follows:
a) Always completely flush out the pump with
water if it will be in an idle (non-operating mode)
for an extended period of time.
b) During shut down leave the pump’s fluid circuit
wet with flush water.
c) The piston position should extend all the way
towards the bottom of the liner. This is known as
the PARK position.
Correct programming of pump motion to achieve
the PARK position involves the following sequence
(assuming clockwise rotation for operation).
Step #1 The FMI pump stops (any location).
Step #2 While monitoring sensor signal, instruct
motor to turn clockwise while looking for the
leading edge of the flag (see figure 2 below).
Step #3 Next rotate Counter Clockwise 90 Degrees
the pump is now PARKED.
IN-ST431-14
2
Home Position
Figure 2
Flag Edge Approaching Sensor
Piston flat facing
intel port
Figure 1
Piston flat approaching
alignment with intel port
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