Trane RTHD

RLC-SVD05A-EN 23
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.
In this troubleshooting procedure, the components will be referred to by the
following descriptions:
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.
Table 3. VFD Fault Conditions
Fault Condition Number of Alarm LED flashes Bus
Overcurrent Fault 1
Bus Overvoltage Fault 2
Motor Overload Fault 3
Low Bus Voltage Fault 4
PWM Generator Fault 5
Logic Fault 6
Stalled Motor Fault 7
Table 4. VFD Components
Description Circuit 1 Circuit 2
1 Comp 2 Comp 1 Comp 2 Comp
Variable Speed Fan
Inverter
3U3 3U3, 3U4 4U3 4U3, 4U4
Dual Inverter Interface
LLID
1U3 1U3 1U3 or 2U3 2U3
Fan Motor 3B3 3B3, 3B13 4B3 4B3,4B13
Fan Fuses 1F1, 1F2, 1F3
(All Voltages)
1F1, 1F2, 1F3
(All Voltages)
1F2, 1F8, 1F9
(All Voltages)
2F7, 2F8, 2F9
(All Voltages)
1F17, 1F18, 119
(380, 400, 460, 575
Volt only)
1F17, 1F18, 1F9
1F20, 1F21, 1F22
(380, 400, 460, 575
Volt only)
1F20, 1F21, 1F22
(380, 400, 460, 575
Volt only)
2F17, 2F18, 2F9
2F20, 2F21, 2F22
(380, 400, 460, 575
Volt only)