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Troubleshooting 45
Your calculated gallons per minute should be
in a mid-range between your maximum gal-
lons per minute and your minimum gallons per
minute.
Example: If your maximum GPM was 7 and
your minimum GPM was 1 you would be run-
ning at 4 GPM (Calculated GPM). This would
mean your Servo Valve would be operating
somewhere around the mid-point. So, if you
increased your speed it could increase your
flow, or if you decrease your speed it can de-
crease the flow. If the calculated GPM is close
to or exceeds the minimum or maximum GPM
readouts, then the problem is not with the
Servo Valve. The sprayer, pump, hand valves,
nozzles or speed require adjustments.
4. To see if the stepper motor and position switch
are functioning properly put the RATE 1/MAN/
RATE 2 switch in the center (manual) posi-
tion and press and hold the or key. This
should drive the valve in one direction. When
the switch cam turns far enough to activate
the position switch the stepper motor should
stop and the display will read MAX or MIN.
If the valve does not stop its direction of travel
when the switch is activated, the valve should
be replaced. The valve should respond to both
the and keys.
5. The Controller provides + 12V to the motor
and also pulses the four phase lines to ground
in sequence to cause the motor to rotate. The
butterfly valve will step 1/10 degree for each
motor pulse.
The position switch closes to indicate both
open and closed valve positions to the con-
sole. The motor can NOT be checked by ap-
plying a voltage to the wires.
MANK
AT
O, MN.
HINIKER C
OMP
ANY
HINIKER
SERVO
SERVO
DWG. NO. 3142B
1
7
2
3
6
4
5
SWITCH
SWITCH RETURN
A
C
D
+12V
B
SWITCH
CAM
BUTTERFLY
GEAR HEAD
STEPPER
MOTOR
NOTE: VALVE MAKES .1° ROTATION PER STEP.
DWG. NO. 3129