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PLUMBING TROUBLESHOOTING CHART
SYMPTOM
System loses pressure in MANUAL
Insufficient pressure adjustment in MANUAL
System pressure too low in MANUAL
Pressure, Speed and Spray Rate
don't correspond to charts
Pressure excessive in AUTO
Pressure fluctuates in AUTO
PLUMBING GUIDELINES
This section details important factors for ideal system
performance. The system diagrams (See pages 9-10) show
optimal plumbing configurations for the ProStop-E ISOBUS
rate controller.
PRESSURE DROPS
All hose, valves and fittings (especially elbows) can cause
undesirable pressure losses. Here are a few points:
1.
Use hoses as large in diameter as practical.
2.
Avoid excessive hose length.
3.
Avoid sharp bends in hose whenever possible.
4.
Use minimum number of fittings.
5.
Use full port valves or the next larger size valve.
6.
Support and fasten hose runs to avoid sagging and
kinking.
HOSE DIAMETER
Hose diameter must be suitably large to maximize flow
between system components - this includes connecting
lines joining the flowmeter, servo valve, and agitation line.
Undersized plumbing can prevent reaching target application
rate and also contribute to system instability.
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 System
38
POSSIBLE CAUSE
Pump Air-lock
Too much flow restriction in servo loop
• Pump starved or too small
• Excessive tank agitation
• Incorrectly positioned throttle, range adjust,
or pressure relief valves
• Inaccurate pressure reading
• Dirty or worn spray tips
• Minimum flow rate is set too high
• Incorrect Inline/Bypass setting
• Sagging or kinked hoses
• Throttle or range valve restricting flow
• Pump starved or too small
• Control Speed calibration number too high
making the valve react excessively
TABLE 2: TROUBLESHOOTING
Checkout. If the throttle valve needs to be more than two
thirds closed, open the Range valve slightly and perform the
Pre-Field System Checkout again.
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.
POSSIBLE SOLUTION
• Clean strainer
• Install larger hoses
• Install larger hoses and fittings
• Remove sharp bends in plumbing
• Install larger hoses/replace pump.
• Reduce tank agitation
• Adjust valves
• Use a different gauge and check each boom.
• Clean or replace spray tips
• Re-calibrate system
• Change Inline/Bypass setting
• Support or replace hoses
• Adjust throttle and range valves
• Install larger hoses
• Install larger pump
• Clean strainer
• Reduce Control Speed setting
HYP1100 (04-08-21)
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