Danfoss VLT MCD 600 Operating Manual

Also see for VLT MCD 600: Installation guide Installation guide Installation guide Operating guide

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Danfoss VLT MCD 600 Operating Manual Manual pdf 124 page image

12 Troubleshooting12.1 Protection ResponsesWhen a protection condition is detected, the soft starter writes this to the event log and may also trip or issue a warning. The softstarter's response depends on the settings in parameter group 6-** Protection Action.Some protection responses cannot be adjusted by the user. These trips are usually caused by external events (such as phase loss) or bya fault within the soft starter. These trips do not have associated parameters and cannot be set to Warn or Log.If the soft starter trips, identify and clear the condition that triggered the trip, then reset the soft starter before restarting. To reset thesoft starter, press [Reset] on the LCP or activate the reset remote input.If the soft starter has issued a warning, it resets itself once the cause of the warning has been resolved.12.2 Trip Messages12.2.1 2-Phase-damaged SCRCauseThis message is shown if the soft starter has tripped on Lx-Tx shorted during the prestart checks and PowerThrough is enabled. Itindicates that the soft starter now operates in PowerThrough mode (2-phase control only).Troubleshooting• Check for either a shorted SCR or a short within the bypass contactor.• Check also parameter 6-19 Shorted SCR Action.12.2.2 Battery/ClockCauseA verification error has occurred on the real-time clock, or the back-up battery voltage is low. If the battery is low and the power is off,date/time settings are lost.Troubleshooting• Reprogram the date and time.• The battery is not removable. To replace the battery, the main control PCB must be replaced.• Check also parameter 6-20 Battery Clock.12.2.3 Bypass OverloadCauseThis trip is not adjustable. Bypass overload protection protects the soft starter from severe operating overloads while running. The softstarter trips if it detects overcurrent at 600% of the contactor rating. Related parameters: None.TroubleshootingOperating Guide | VLT® Soft Starter MCD 600AQ262141844215en-000202 / 175R1174124 | Danfoss A/S © 2018.10