Danfoss VLT HVACDrive Instruction Manual

Also see for VLT HVAC Drive FC 100 Series: Design guide Design guide Programming guide Design guide

Contents

Danfoss VLT HVACDrive Instruction Manual Manual pdf 151 page image

8 Troubleshooting8.1 Alarms and Warnings8.1.1 Alarms and WarningsA warning or an alarm is signaled by the relevant LED on the front of the adjustable frequency drive 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 adjustable frequency drive will have tripped. Alarms must be reset to restart operation once their cause has been rectified.This may be done in four ways:1. By using the [RESET] control button on the LCP.2. Via a digital input with the “Reset” function.3. Via serial communication/optional serial communication bus.4. By resetting automatically using the [Auto Reset] function, which is a default setting for VLT HVAC Drive Drive, see par. 14-20Reset Mode inthe FC 100 Programming GuideNOTE!After a manual reset using the [RESET] button on the LCP, the [AUTO ON] or [HAND 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 line power supply must be switched off before the alarm can bereset. After being switched back on, the adjustable frequency drive is no longer blocked and may be reset as described above, oncethe cause has been rectified.Alarms that are not trip-locked can also be reset using the automatic reset function in par. 14-20Reset Mode (Warning: automaticwake-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 analarm, or it can be specified whether it is a warning or an alarm that is to be displayed for a given fault.This is possible, for instance, in par. 1-90Motor Thermal Protection. After an alarm or trip, the motor carries on coasting, and the alarmand warning flash on the adjustable frequency drive. Once the problem has been rectified, only the alarm continues flashing.VLT® HVAC Drive Instruction Manual 8 TroubleshootingMG.11.AB.22 - VLT® is a registered Danfoss trademark 8-18