Menus and information they provide, Fault History

Variable speed drives/frequency converters

Menus and information they provide

The following menu items/screens on the variable speed drive/frequency converters provide the following useful information to the operator.

OUTPUT FREQUENCY (Monitor Menu)

This screen tells the operator the frequency the motor is running at when the machine is in operation. The value for output frequency should be constant when the machine is running. If there is a ﬂuctuation in output frequency when the machine is running, generally this indicates the motor is running at or near the limit of its programmed current limit. The current limits (predeter- mined and set by Husqvarna Constructions Products) are as follows:

1. Combined large and small motor - 16 amps.

If there is a ﬂuctuation in output frequency when the machine is in operation, it is advisable to check the motor current as well. This can be found by pressing the UP arrow on the keypad 3 times. For trouble free operation concerning current issues, it is best to keep output current at or around 12-13 amps. The current draw of the motor can be reduced by reducing the speed of the motor using the speed dial on the control panel near the handle bars.

MOTOR CURRENT (Monitor Menu)

This screen displays the current draw of the corre- sponding motors. See comments already covered un- der OUTPUT FREQUENCY relating to motor current.

DC LINK VOLTAGE (Monitor Menu)

This screen displays the quality of the power supply to the machine. It will read higher values when the machine is in stand-by and lower values when the machine is in operation. When DC LINK voltage is reduced (in the case of a poor power supply), the vari- able speed drive/frequency converter will draw more current to compensate. This is why poor power supply will lead to the machine drawing maximum current on a premature basis (for further comments see page 11).

FAULT HISTORY

The fault history menu stores the last series of faults experienced by the variable speed drive/frequency converter. If there is a recurring fault pattern experi- enced by the machine, the information can be obtained from the fault history menu. For more on faults, see trouble shooting faults.

14- English