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Troubleshooting
This section can assist in field troubleshooting LiquiFlo 2.0
drives, and can provide information, which others can use
to help you troubleshoot the drive.
WARNING
Hazardous Voltage w/Capacitors!
Failure to disconnect power and discharge capacitors
before servicing could result in death or serious injury.
Disconnect all electric power, including remote
disconnects and discharge all motor start/run
capacitors before servicing. Follow proper lockout/
tagout procedures to ensure the power cannot be
inadvertently energized. For variable frequency drives
or other energy storing components provided by Trane
or others, refer to the appropriate manufacturer's
literature for allowable waiting periods for discharge of
capacitors. Verify with an appropriate voltmeter that all
capacitors have discharged.
For additional information regarding the safe discharge
of capacitors, see PROD-SVB06*-EN
Note: Graphic labels (shown above) are used for CE
application only.
Important:
•
Before servicing, disconnect all power sources and
allow at least 10 minutes for capacitors to discharge.
•
All electrical enclosures-unit or remote-are IP2X.
1. Collect alarm and parameter information.
a. DO NOT cycle unit power or reset the controls.
Leave AFD and UC800 in their present states.
b. Record the "AFD Last Diagnostic Code" using
Tracer TU. This value is available under the Unit
Status tab, in the Motor expanding box.
c. Record all UC800 active and historic alarms. Make
a full chiller service report.
AFDE-SVU02F-EN
d. Document and check all applicable parameter
settings. This information can be verified from the
chiller nameplate, and by referring to this manual.
e. In the Binding view of the Tracer® TU service tool,
verify there is a green circle indicating that the AFD
Recomm Starter LLID is bound.
f. If an OIM is available, record any drive diagnostics
found.
2. Collect Chiller Information.
a. Note the following chiller information:
• Operating mode and any sub-mode (i.e.,
100 percent or 75 percent load etc.)
• Number of chiller starts, and hours of operation.
• Time since last diagnostic shutdown (<1 minute,
<1 hour, >1 hour, etc.)
b. What was the chiller state at the time of the failure?
(Chiller starting? Running low load? Running full
load? etc.)
c. Record the chiller's sales order and serial numbers,
& the drive's serial and model numbers.
3. Troubleshooting
a. Measure and record the DC bus (via the Operator
Interface Module [OIM]).
b. Check ALL wiring (tightness, ribbon cables fully
seated, proper phasing, etc.)
c. Refer to the Rockwell manuals for further
troubleshooting information (manual D2-3496-1).
d. If possible, Use the Rockwell OIM and provide the
following drive parameter information:
• LiquiFlo 2.0 (inverter) Parameters 49, 50, 209,
210, 224, 225, 226, 227, 228, 229, 230, 243, 244,
245, 246, 247, 248, 249, 250, 251, 252, 262, 263,
264, 265, 266, 267, 268, and 269.
X39003893001A
4. Drive Over Temperature
a. Measure refrigerant pump discharge pressure and
compare to the condenser pressure. It should be 10-
15 psid.
b. Measure drive coolant line delta-T.
c. Record parameters 120, 121, and 122 from the
active rectifier.
d. Operate the condenser at or below design
temperature. Elevated tower water temperatures
will raise drive temperatures.
e. The ambient temperature must remain below
specification (refer to
fan grills are clean and operational.
f. Do not place manuals or prints below the power
module as this can block air flow.
Troubleshooting
Table 1, p.
13). Make sure the
47
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