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BASIC SAFETY INSTRUCTIONS

Short-circuit resistance

The drive converters are conditional short-circuit proof. After resetting the internal pro-

tection devices, the function as directed is guaranteed.

Exceptions:

• If an earth-leakage fault or short-circuit often occurs at the output, this can lead to a

defect in the unit.

• If a short-circuit occurs during regenerative operation (2nd or 4th quadrant, regen-

eration into the DC link), this can lead to a defect in the unit.

Switching at the output

Switching between motor and drive converter is prohibited for single drives during ope-

ration as this may trigger the protection gear of the device. Function ‚speed search‘ must

be activated if switching can not be avoided. Speed search may only be triggered after

closing the motor contactor (e.g. by switching the control release).

Connecting and disconnecting is permissible with multiple motor drives if at least 1 mo-

tor is running during the switch-over process. The drive converter must be dimensioned

to the occurring starting currents.

The ‚speed search‘ function must be activated if the motor is still running during a restart

of the drive converter (mains on) (e.g. due to large rotating masses).

Switching an the input

Forapplicationsthatrequirecyclicswitchingo󰀨andonofthedriveconverter,maintain

ano󰀨-timeofatleast5minafterthelastswitchon.Ifyourequireshortercycletimes

please contact KEB Automation KG.

1.6 Maintenance

The following maintenance work has to be carried out when required, but at least once

per year by authorized and trained personnel.Check unit for loose screws and plugs and

tighten if necessary.

► Check system for loose screws and plugs and tighten if necessary.

► Clean drive converter from dirt and dust deposits. Pay attention especially to coo-

lingnsandprotectivegridofthefans.

► Examineandcleanextractedairlterandcoolingairlterofthecontrolcabinet.

► Check the function of the fans of the drive converter. The fan must be replaced in

case of audible vibrations or squeak.

► In the case of liquid-cooled drive converters a visual test of the cooling circuit for

leaks and corrosion must be carried out.The cooling circuit must be completely

emptyifaunitshallbeswitchedo󰀨foralongerperiod.Thecoolingcircuitmustbe

blownoutadditionallywithcompressedairattemperaturesbelow0°C.

KEB COMBIVERT H6 Series User Manual

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