
NP2540
Troubleshooting
107
2019-04-12
417-459M
NH
3
Metering System Troubleshooting
Problem
Cause
Solution
Pressure Spikes (no
alarm)
Plugged tine or tines
Stop application per page 68. Lift
applicator and inspect tines. Clear any
plugging per “
Flow divider pressure sag
Open line or lines
Stop application per page 68. Lift
applicator and inspect tines for open line
plugging. Clear any plugging per
Temperature Rise (no
alarm)
Plugged refrigerant vapor line
Stop application per page 68. Lift
applicator and inspect tines. Clear any
plugging per “
Rate Alarm, Low
System not fully charged
Expect early rate alarms until the cooler is
ensuring that all meter flow is liquid.
One or more manual valves not fully open
Suspend operations (per page 67). Check
all manual valves from nurse tank
withdrawal valve to emergency shut-off
valve.
Solenoid or control valve malfunction or harness
status
Suspend operation (page 67).
Close emergency shut-off valve.
Discharge line from emergency shut-off
valve to tines.
Wait for applicator to be safe to approach.
Check harness connections and fuses.
Use console SELF-TEST mode to
command Raven valves open. Check
valve ball indicators at valves.
Field speed too high (higher than available
pressure can supply
NH
3
)
Slow down, or wait for warmer conditions.
Tank pressure low
Ambient or tank temperature may be too
low to provide sufficient delivery pressure.
Wait for tank to warm, or wait for warmer
weather.
Rate Alarm, High
Incorrect VALVE CAL for Control Valve or METER
CAL for flow meter.
Recheck console setup against values
provided for components (page 42).
Control Valve failed, or harness status
Suspend operation (page 67).
Close emergency shut-off valve.
Discharge line from emergency shut-off
valve to tines.
Wait for applicator to be safe to approach.
Check harness connections and fuses.
Use console SELF-TEST mode to
command rate to zero open. Check valve
ball indicators at valves. Command rate to
maximum. Check ball indicator.
Excess
NH
3
Remaining
(but no alarms)
Incorrect console setup
Re-check METER CAL and BOOM CAL.
Field size different.
After ruling out metering problems,
re-check geography.
Excessive gaps between fertilizer applicator
passes.
Gap between opposing pass end trenches
should be one row space (e.g. 30 inches)
Flow meter malfunction
Consult dealer.