Trane RTHD Troubleshooting Manual page 23

Table 4. VFD Components
Description
Variable Speed Fan
Inverter
Dual Inverter Interface
LLID
Fan Motor
Fan Fuses
RLC-SVD05A-EN
Variable Speed Fan Control - RTAC Only
TRANEAC INVERTER this LED will remain illuminated for up to 60 seconds while
the DC Bus Capacitor Voltage discharges. This LED also indicates that the 5 VDC
Supply Voltage on the TRANE AC INVERTER control board is present.
Alarm LED. When this red LED is illuminated constantly, it indicates that the
motor is overloaded and the drive is about to fault on a motor overload. When
the Alarm LED is flashing, it indicates the drive is faulted. By counting the
number of times the Alarm LED flashes, the cause of the fault can be determined.
The following table lists the possible fault conditions.
Table 3. VFD Fault Conditions
Fault Condition
Overcurrent Fault
Bus Overvoltage Fault
Motor Overload Fault
Low Bus Voltage Fault
PWM Generator Fault
Logic Fault
Stalled Motor Fault
In this troubleshooting procedure, the components will be referred to by the
following descriptions:
Circuit 1
1 Comp 2 Comp
3U3 3U3, 3U4
1U3 1U3
3B3 3B3, 3B13
1F1, 1F2, 1F3 1F1, 1F2, 1F3
(All Voltages) (All Voltages)
1F17, 1F18, 119 1F17, 1F18, 1F9
(380, 400, 460, 575 1F20, 1F21, 1F22
Volt only) (380, 400, 460, 575
Volt only)
1 Using TechView, go into the Unit Configuration View and verify the Low
Ambient Capacity Condenser is selected for Condenser Temperature Range.
This will also be reflected as an L or W in digit 17 of the model number. Go
into Binding View and verify that the fan control LLIDs are bound.
2 Verify that all inverter power and control signal wiring is correct for the
affected circuit. The wiring diagrams are found in RTAC-SVX01C-EN or on the
inside of the unit fan control door.
Number of Alarm LED flashes Bus
1
2
3
4
5
6
7
Circuit 2
1 Comp
4U3
1U3 or 2U3
4B3
1F2, 1F8, 1F9
(All Voltages)
1F20, 1F21, 1F22
(380, 400, 460, 575
Volt only)
2 Comp
4U3, 4U4
2U3
4B3,4B13
2F7, 2F8, 2F9
(All Voltages)
2F17, 2F18, 2F9
2F20, 2F21, 2F22
(380, 400, 460, 575
Volt only)
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