‹ Before Power Up The following points should be checked carefully before the power is switched on. • Check if the power supply meets the inverter specification. • Check if the power supply cables are tightly connected to the right terminals (L1, L2, L3). • Check if the motor cables are tightly connected to the right terminals on the inverter side (U, V, W) as well as on the motor side. • Check if the braking unit / braking resistor is connected correctly. • Check if the Inverter control circuit terminal and the control device are wired correctly. • Set all Inverter control circuit terminals to OFF. • When a PG card is used, check if it is wired correctly.
‹ Display after Power Up After normal power up without any problems the operator display shows the following messages Display for normal operation The frequency reference monitor is displayed in the data display section. When a fault has occurred or an alarm is active a fault or alarm message will appear. In this case, refer to page 21, Troubleshooting . A fault or alarm message is shown on the display. The example shows a low voltage alarm. Display for fault operation ‹ Autotuning for Line-to-Line Resistance Autotuning can be used to improve the performance when very long motor cables are used or when motor and inverter have different power ratings.
To perform autotuning set T1-02 (Motor rated power) and T1-04 (Motor rated current) and then press the RUN key on the Digital Operator. The Inverter will supply power to the motor for approxi- mately 20 seconds and the line-to-line resistance (stator windings and cable resistance) will be mea- sured automatically. 1. Power will be supplied to the motor during autotuning but the motor will not turn. Do not touch the motor until autotuning has been completed. 2. Ensure that all motor contactors are closed before the autotuning is started. 3. To cancel autotuning press the STOP key on the Digital Operator.
IMPORTANT „ Other Alarms and Faults During Autotuning For an overview of possible autotuning alarms or faults and corrective actions refer to page 23, Auto- tuning Faults . EN-16