micro-trak MT-2400 LR, Справочное руководство

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45
For oversized pumps
For positive displacement pumps
If optional relief valve kit is used
TANK SHUT-OFF VALVE
The tank shut-off valve is for convenience only. It allows you
to work on the plumbing without draining the tank. It should
always be fully open during operation.
See MT­2400 System
Layout Illustration on page 9.
AGITATION SHUT-OFF VALVE
The agitation shut-off valve is mostly for convenience. It
allows you to work on the plumbing without draining the
tank. It should normally be fully open during operation. See
MT­2400 System Layout Illustration on page 9.
PRESSURE RELIEF VALVE
The pressure relief valve is used to avoid excessive pressure
when the booms are turned off. Start with the “T” handle
screwed mostly out. Slowly bring pump up to operating
RPM (make sure pressure does not go too high). Put the
MT-2400 in MAN and turn boom on. Hold adjust switch to “+”
for about 30 seconds to fully close servo valve. Turn booms
OFF. Now slowly screw “T” handle in until maximum desired
pressure is reached. Lock “T” handle in place with locking nut
or collar. See Illustration 46 to the right.
NOTE: Spraying Systems 144H DirectoValve has a maximum
pressure rating of 100 PSI (7 bar).
RANGE ADJUST VALVE
The range adjust valve is required when the pump is much
larger than necessary. When the range valve is opened,
some of the liquid will be bypassed around the pump to
avoid “overloading” the rest of the system. The setting of the
range adjust valve is determined by the throttle valve. Start
with the range valve fully closed and perform the Pre-field
Preparation & System Checkout on page 33. If the throttle
valve needs to be more than two thirds closed, open the
Range valve slightly and perform the Pre-field Checkout
again. See Illustration 45 to the right.
THROTTLE VALVE
The throttle valve limits your high end to maximize servo
performance. Start with throttle valve fully open and perform
the Pre-field System Checkout on page 36. See MT­2400
System Layout Illustration on page 10.
EXAMPLE
With the throttle fully open and servo fully closed, you may
be able to get 50 GPA at 5 MPH when you only want 25 GPA.
If you were to simply open the servo you may be able to get
down to 25 GPA, but if your speed should drop to 3 MPH, the
servo can’t open any farther and won’t be able to maintain
25 GPA. Therefore, if you leave the servo closed and close
the throttle until your high end has dropped from 50 GPA to
about 30 GPA, the servo has a greater operating range.
The throttle valve pictured in the system diagram is a
needle valve (Spraying Systems Type 12690 or 12795). A ball
valve may be used but is more difficult to adjust and keep
adjusted. Do not install a pressure regulator or relief as a
throttle valve.
If the throttle is too far closed, PSI may fluctuate greatly in
AUTO.
Plumbing Guidelines
(cont)
Valve Purpose and Adjustments
Illustration 45
Illustration 47
Illustration 46
Tee “C”
Range
Adjust Valve
Tee “A”
Tee “C”
Tee “A”
Pressure
Relief Valve
Servo
Valve
Relief Valve
Tee “B”
RELIEF SOLENOID VALVE
The relief solenoid will ensure enough bypass to avoid
excessive pressure when the boom valves are turned off. See
Illustration 47 below.