SGNe Troubleshooting Guide Page 26
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
.
Remote Stop Failure
Will occur if the REMOTE START/STOP option is enabled, the remote stop button remains
open and either start button is pressed.
Remote Start Failure
Will occur if the unit is started by the remote start button and the button stays closed for 7
seconds after the unit starts.
Sensor Failure
Will occur when a sensor is recognized as missing or broken. The sensors affected by this
alarm are 4APT, 3APT, 2APT, and 2ATT. The sensor should be displayed along
with the
sensor failure message.
The sensor failure message shall follow the following format
: SENSOR FAILURE 4APT.
Sensor 4APT has the following additional logic
. A sensor failure 4APT will be issued if the
sump pressure is over 100 psi and the package discharge pressure (4APT) is 50 psi less
than the sump pressure.
Emergency Stop
Will occur when the EMERGENCY STOP button is engaged.
VSD Faults
The VSD fault is read from the drive. The Intellisys will read the status menu of the variable
speed drive. If a fault condition is returned in the status information, the Intellisys
will issue a
VSD FAULT alarm and display the number of the fault condition. VSD faults 39 – 42 and 44
can’t be cleared by pressing the reset button. All other VSD faults can be cleared by pressing
the reset button. The only way to clear a VSD fault 39 – 42 or 44 is by cycling the power o
n
th
e compressor. Cycling the power causes the VSD to execute a power module test.
The power module test must be passed before the compressor can be restarted after a VSD
fault 39 – 42 or 44. VSD faults 39, 40, and 41 (IGBT failures) have additional logic associated
with them. Due to false alarms the logic was modified to allow an automatic restart.
If the VSD fault 39, 40, or 41 occurs, the SGNe controller will alarm and display the fault
message. After 2 minutes, the SGNe controller will issue a command to the VSD to run the
power module test. While the VSD is running the power module test, the SGNe controller will
force itself into a reset. Upon completing the reset, the SGNe controller will monitor the VSD
for completion of the power module test. If the power module test is completed and all
conditions have passed, the SGNe will automatically restart the compressor. If the power
module test is failed, the
SGNe will show the power module test failure message and the
failure code.
Another exception on all drives are VSD faults 10, 12 – 14, and 16. If the compressor has
PORO installed, instead of shutting down on the VSD fault, the Intellisys wil
l reset, allowing
the compressor to restart by the PORO function. A unit will be allowed to d
o this up to 5 times
in a 1 hour period. If the unit exceeds 5 occurrences within a 1 hour period
, the 6th occurrence
will be treated like a regular VSD fault. If the compressor is not equipped with PORO, VSD
faults 10, 12 – 14, and 16 will be treated like any other VSD fault.
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