19
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 off and on of the drive converter, maintain
an off-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 fins and protective grid of the fans.
► Examine and clean extracted air filter and cooling air filter 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 off for a longer period. The cooling circuit must be
blown out additionally with compressed air at temperatures below 0°C.
Summary of Contents for COMBIVERT S6 Series
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