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TorqueTrak Revolution Troubleshooting Guide
WARNING: Supply voltage (up to 230VAC) is live inside the Master Control Unit (MCU) even when the Main Power
switch is off!
Use caution when accessing internal controls.
When the TorqueTrak Revolution is first powered up, it cycles through the startup sequence, lasting 10-15 seconds.
During startup mode, all of the Indicator lights flash in unison. If all system checks are positive, the Main System Status
light on the outside of the control box remains on solid, and the system is ready for operation.
Normal Operating Mode (no errors)
Indicator
Condition
Main System Status (red light outside MCU)
On solid
Stator (green light inside MCU)
On solid
Rotor (green light inside MCU)
On solid
Data (green light inside MCU)
On solid
Range (red light inside MCU)
Off
If an error is present, the Main System Status light will flash and the system will display an error code briefly (another 10-
15 seconds) before the startup cycle repeats. Below are the most common error modes and potential corrective actions.
Error Mode: Power supply voltage to system is incorrect
Indicator
Condition
Suggested Corrective Action
Main System Status
Fast flash (4 Hz)
1. Supply the correct voltage to the MCU (see manual
for details)
Stator
Flashing (2 or 4 Hz)
Error Mode: Weak inductive interface
Indicator
Condition
Suggested Corrective Action
Main System Status
Fast flash (4 Hz)
1. Make certain the Rotating Collar connectors are not
damaged and are completely engaged
2. Check alignment of the Rotating Collar within the
Power Ring: the back surface of the Collar should
align with the back edge of the Mounting Block
3. Make certain the Power Coil is not shorted to the
MCU enclosure by water or other conductive
material
4. Remove any surrounding metal other than the shaft
within 1 inch (2.5 cm) of the Power Coil
5. Verify that Rotating Coil voltage is about 120 mVAC
(probe the two terminal dots on the outer surface of
the Coil Boards attached to the Rotating Collar)
6. Verify voltage is about 35 mVAC across the outer
set of attachment screws to the Mounting Block
7. Clean the mating surfaces of the Power Ring and
tighten all the mounting screws
Stator
On solid
Rotor
Slow flash (2 Hz)
Data
Off or flickering
Error Mode: Strain gage problem
Indicator
Condition
Suggested Corrective Action
Main System Status
Fast flash (4 Hz)
1. Verify the excitation voltage to the gage is 2.5 VDC
(or light on Star Bridge should be on solid when
connected in place of the gage)
2. Check solder connections and wiring to the gage
3. Balance the gage to reduce the offset or apply a
new gage
Stator
On solid
Rotor
On solid
Data
On solid
Range
On solid
