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13-17-621 Page 143
P.2
Fault
Low DC supply
Voltage fault
Control panel 24VDC
power supply has
dropped below the low
DC voltage fault limit.
Refer to the compressor package wiring diagram.
Using a multi-meter, measure 24VDC supply at
the power supply output terminals. If voltage is
low, use the adjustment screw to raise voltage to
24VDC. If voltage is not present check for AC
supply on the input side of the power supply.
Check fuses protecting the AC supply to the DC
power supply. Replace fuses or DC power supply
as needed.
P.3
Fault
Low Sump
Pressure Fault
Reservoir pressure has
dropped below the low
sump pressure fault level
during operation.
Inspect blowdown and inlet valve control circuits
for leaks. Confirm proper setting of blowdown
adjustment device, if equipped.
P.4
Warning
Design Pressure
Warning
During sequencing
operation the plant
delivery pressure has
exceeded the unload
pressure by 1bar
(14.5psi).
Inspect process air piping downstream of
compressor package for blockages or closed
process valves. Check aftercooler for blockages.
Confirm adequate air storage for compressor
system.
P.5
Fault
No Start
Pressure Fault
Controller did not detect
proper pressure build-up
during start.
Check for proper direction of rotation of airend.
Check condition of minimum pressure valve.
P.6
Fault
Heavy Startup
Fault
Reservoir pressure
exceeded the heavy
start-up fault limit during
start-up.
Inspect inlet valve assembly for leaks and proper
sealing during startup. Confirm proper adjustment
of control pressure regulator if equipped.
P.7
Warning
Ambient
temperature
speed limiter
warning
Ambient temperature is
above the limiter set
point.
Lower ambient temperature in compressor
package area.
P.8
Warning
Control box
temperature
limiter warning
Control panel internal air
temperature above the
limiter set point.
Confirm ambient temp near the compressor
package inlets is below the rating of the machine.
Check ventilation filters and fans mounted in the
control panel for debris, clean/replace as needed.
P.9
Warning
Cold start speed
limiter warning
Ambient temperature is
below the limiter set
point.
Raise ambient temperature in compressor
package area.
P.10
Warning
Voltage factor
limiter warning
Package input voltage is
below the tolerance of
the compressor package.
The motor is overloaded
causing the VFD's DC
Bus voltage to fall below
the limiter set point.
Check wiring between motor and VFD for
incorrect or loose connections. Verify supply
voltage within tolerance. Check drive system for
proper alignment and wear. Decouple
compressor from drive motor and check for
proper manual rotation. Test motor insulation
resistance.
P.11
Warning
Drive current
speed limiter
active
VFD output current is
above the limiter set
point. Motor is
overloaded.
Check wiring between motor and VFD for
incorrect or loose connections. Verify supply
voltage within tolerance. Check drive system for
proper alignment and wear. Decouple
compressor from drive motor and check for
proper manual rotation. Test motor insulation
resistance.
P.12
Warning
Heatsink
temperature
limiter warning
VFD heatsink
temperature is above the
limiter set point.
Confirm ambient temperature near the VFD is
below 50C. Check ventilation filters and fans
mounted in the control panel for debris. Check the
VFD heat sink cooling fans for correct operation.
Clean cooling fans and heat sink fins with
compressed air.
P.21
Warning
Low voltage
relay warning
Programmable input for
low voltage relay warning
Inspect low voltage relay and monitor for
conditions causing the device to trip.