Installation manual

Diagnostics and Troubleshooting

Fault Descriptions

Flash Invalid

This fault indicates that the firmware checksum has failed. From the Tools menu, Flash Upgrade to reprogram/upgrade

the firmware stored in flash memory. If this problem persists, call Control Techniques. A common cause would be an

interrupted F/W Flash upgrade (cable disconnected in the middle of an upgrade process).

Drive Overtemp

Indicates the drive IGBT temperature has reached 100ºC (212ºF).

Power Up Test

This fault indicates that the power-up self-test has failed. This fault cannot be reset with the reset command or reset

button.

NVM Invalid

At power-up the drive tests the integrity of the non-volatile memory. This fault is generated if the contents of the non-

volatile memory are invalid.

Invalid Configuration

If this occurs call Technical Support at Control Techniques.

Power Module

This fault is generated when a power stage over-temperature, over-current or loss of power stage logic supply occurs.

This can be the result of a motor short to ground, a short in the motor windings, a motor cable short or the failure of a

switching transistor.

It can also occur if the drive enable input is cycled “Off” and “On” rapidly (>10 Hz).

High DC Bus

This fault will occur whenever the voltage on the DC bus exceeds 440 Vdc. The most likely cause of this fault would be

an open shunt fuse, a high AC line condition or an application that requires an external shunt (e.g., a large load with

rapid deceleration).

Low DC Bus

This fault will occur whenever the voltage on the DC bus drops below 60 Vdc. The most likely cause of this fault is a

reduction (or loss) of AC power. A 50 ms debounce time is used with this fault to avoid faults caused by intermittent

power disruption. For some types of custom motors it may be necessary to disable this fault. Refer to “Low DC Bus Fault

Enable” on page 62 of the Faults view section of Setting Up Parameters for more information.

Following Error

(Position mode) (Pulse mode)

Reset Button or Input Line Yes

Travel Limit +/- Auto No

All “On”

Normally "On" for one

second during power up

Yes

Display Fault Action to Reset Bridge Disabled