Danfoss vlt FC 102 Operating Instructions Manual

Also see for VLT HVAC Drive FC 102: Operating instructions Service guide Programming guide Installation guide Installation guide

7. Troubleshooting7.1. Alarms and warnings7.1.1. Alarms and warningsA warning or an alarm is signalled by the relevant LED on the front of the frequency converter and indicated by a code on the display.A warning remains active until its cause is no longer present. Under certain circumstances operation of the motor may still be continued. Warning messagesmay be critical, but are not necessarily so.In the event of an alarm, the frequency converter will have tripped. Alarms must be reset to restart operation once their cause has been rectified. Thismay be done in four ways:1. By using the [RESET] control button on the LCP control panel.2. Via a digital input with the “Reset” function.3. Via serial communication/optional fieldbus.4. By resetting automatically using the [Auto Reset] function, which is a default setting for frequency converter. seepar. 14-20 Reset Mode inVLT® HVAC Drive Programming Guide, MG.11Cx.yyNB!After a manual reset using the [RESET] button on the LCP, the [AUTO ON] button must be pressed to restart the motor.If an alarm cannot be reset, the reason may be that its cause has not been rectified, or the alarm is trip-locked (see also table on following page).Alarms that are trip-locked offer additional protection, means that the mains supply must be switched off before the alarm can be reset. After beingswitched back on, the frequency converter is no longer blocked and may be reset as described above once the cause has been rectified.Alarms that are not trip-locked can also be reset using the automatic reset function in parameter 14-20 (Warning: automatic wake-up is possible!)If a warning and alarm is marked against a code in the table on the following page, this means that either a warning occurs before an alarm, or it canbe specified whether it is a warning or an alarm that is to be displayed for a given fault.This is possible, for instance, in parameter 1-90Motor Thermal Protection. After an alarm or trip, the motor carries on coasting, and the alarm and warningflash on the frequency converter. Once the problem has been rectified, only the alarm continues flashing.VLT® HVAC Drive Operating Instructions 7. TroubleshootingMG.11.A6.02 - VLT® is a registered Danfoss trademark 1357