McQuay RVSS14 Installation, Operation And Maintenance Manual page 51

Other Situations
Motor Rotates in Wrong Direction
Erratic Operation
Motor Overheats
Starter cooling fans do not operate
(When Present)
Analog Output not functioning
properly
IOMM Starter
Condition
Phasing incorrect
Loose connections
Motor overloaded
Too many starts per hour
High ambient temperature
Acceleration time too long
Incorrect motor OL settings
Motor cooling obstructed/damaged
Fan power supply lost
Fan wiring problem
Fan failure
Voltage/Current output jumper (JP1)
not set correctly.
Wiring problem
Analog Output Function parameter
(I/O 12, P50) set incorrectly.
Analog Output Offset and/or Span
parameters (I/O 13-14, P51-52) set
incorrectly.
Load on analog output too high.
Ground loop or noise problems.
Cause
If input phasing correct, exchange
any two output wires.
If input phasing incorrect, exchange
any two input wires.
Shut off all power and check all
connections.
Reduce motor load.
Allow for adequate motor cooling
between starts. Set Hot/Cold ratio
higher or lengthen cooling time.
Reduce ambient temperature or
provide for better cooling. Set OL
class lower to compensate for
ambient temperature.
Reduce starting load and/or review
acceleration ramp settings.
Review and correct if necessary
motor OL settings.
Remove cooling air obstructions.
Check motor cooling fan.
Verify fan power supply, check fuses.
Check fan wiring.
Replace fan
Set jumper to give correct output.
Verify output wiring.
Verify that the Analog Output
Function parameter is set correctly.
Verify that the Analog Output Span
and Offset parameters are set
correctly.
Verify that load on analog output
meets D3 control analog output
specifications.
Verify correct grounding of analog
output connection to prevent noise or
ground loops from affecting output.
Solution
51