quickly impact and damage the electronics. In these areas,cabinet fitting with fresh-air circulation in the cabinet isrecommended, thereby ensuring that aggressive gases arekept away from the frequency converter.CAUTIONFitting of frequency converters in aggressiveenvironments increases the risk of stoppages, in additionto considerably reducing the service life of the unit.Before installing the frequency converter, ensure there areno liquids, particles, or gases in the air by looking atexisting installations in the same environment. Typicalindicators of harmful airborne liquids are water or oil onmetal parts or corrosion of metal parts. Too many dustparticles are typically observed on top of installationcabinets and on existing electrical installations. Indicatorsthat there are aggressive gases in the air are copper railsand cable ends that are black on existing electrical instal-lations.5.2 Display and Messages5.2.1 Display ReadoutFrThe frequency converter shows the present outputfrequency in Hertz [Hz].IoThe frequency converter shows the present output currentin Amps [A].UoThe frequency converter shows the present output voltagein Volt [V].UdThe frequency converter shows the intermediate circuitvoltage in Volt [V].PoThe frequency converter shows the calculated output inkilowatt [kW].notrunThis message is shown if an attempt is made to change aparameter value while the motor is running. Stop themotor to change the parameter value.LCPThis message is shown if an LCP 2 control unit is fitted andthe [QUICK MENU] or [CHANGE DATA] key is pressed. If anLCP 2 control unit is fitted it is only possible to changeparameters with LCP 2.HaThe frequency converter shows the present Hand modereference frequency in Herz (Hz).SCThe frequency converter shows scaled output frequency(the present output frequency x parameter 008).5.2.2 Warnings and Alarm MessagesA warning or an alarm appears in the display as anumerical code Err. xx. A warning is shown in the displayuntil the fault has been corrected, while an alarmcontinues to flash until the [STOP/RESET] key is pressed.Table 5.7 shows the various warnings and alarms, andwhether the fault locks the frequency converter. After aTrip lock, the mains supply is cut off and the fault iscorrected. The mains supply is reconnected and thefrequency converter is reset. The frequency converter isnow ready. A Trip can be reset manually in 3 ways:• Via the operating key [STOP/RESET].• Via a digital input.• Via serial communication.It is also possible to select an automatic reset in parameter405 Reset function. When a cross appears in both warningand alarm, this can mean that a warning comes before analarm. It can also mean that it is possible for the user toprogramme whether a warning or an alarm appears for agiven fault. For example, this is possible in parameter 128Motor thermal protection. After a trip, the motor coasts, andalarm and warning blink on the frequency converter, but ifAll about VLT 2800 Design Guide136 Danfoss A/S © Rev. May/2014 All rights reserved. MG27E40255