SGNe Troubleshooting Guide Page 27
Revision 1.0; Davidson, May 2009. ©Ingersoll Rand Proprietary Information
SGNe
Troubleshooting Guide
Danger
Please utilize extreme caution when performing work within the compressor cabinet.
When opening the cabinet: be certain to wear appropriate PPE (Personal Protective Equipment),
follow lock out-tag out procedures, and ensure all safety procedures are followed
.
High Start Pressure
If the sump pressure is above 100 psi when the compressor starts, the Intellisys will open
the blowdown valve during the first few seconds of starting (3 – 7 seconds). If the
sump
pressure does not fall to 100 psi during that time period, this shutdown will occur.
Low Sump Pressure
Will occur if the compressor is operating and the sump pressure drops below 15 psi for
15 seconds.
Check Motor Rotation
This will occur if the Intellisys reads a negative speed from the VSD when starting.
VSD Communication Failure
This will occur if the Intellisys does not receive a response from the VSD when
requesting information. This alarm will take about 8 seconds to occur.
VSD Initialization Fault
Will occur if the Intellisys is unable to establish communications with the VSD after a
power up.
Replace Coolant Filter
Will occur if the idle mode is set to On. This alarm is used as a reminder to IR service to
only use idle mode if a new coolant filter is installed.
Incorrect VSD Type
Will occur at power up if the VSD type does not match the size of compressor.
Control Power Loss
This will occur if the compressor should be running and the AC input voltage, as read
from the VSD, falls below 100 VAC.
There is a delay of 2 seconds on this alarm in
case the power quickly returns. An open
HAT switch or phase monitor are 2 things that
can cause this alarm.
Stop Failure
This will occur if the compressor should be stopped, but the motor speed has not
dropped below the minimum motor speed set point. The Intellisys will wait 4 seconds
for the compressor to stop before issuing this alarm.
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