12
bASIC SAFETY INSTRUCTIONS
Switching an the input
For applications that require cyclic switching on and off of the drive converter, a time
of at least 5 min must have elapsed after the last switch-on.If you require shorter cycle
times please contact KEB Automation KG.
Short-circuit proof
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, regener-
ation into the DC link), this can lead to a defect in the unit.
WARNING
Automatic Restart !
Drive converters may be set, dependent on type, to restart automatical-
ly following a fault stoppage (e.g. Undervoltage Error), when the fault
conditions clear. System design must take this into account, if appro-
priate, and additional monitoring or protective features added where
necessary.
Attention
Voltage Peaks !
When using IGBT inverters, high voltage peaks may arise in the motor
due to the switching action of the inverter output devices. These must
be taken into account when using motor cables longer than 15m or
high frequency motors. In this case, the motor can be protected with a
motor choke, dv/dt filter or sine filter.
1.7 Maintenance
Die folgenden Wartungsarbeiten sind nach Bedarf, mindestens jedoch einmal pro Jahr,
durch autorisiertes und eingewiesenes Personal durchzuführen.
►
Check unit for loose screws and plugs and if necessary tighten up.
►
Clean drive converter from dirt and dust deposits. Pay attention especially to cool-
ing 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 fans must be replaced in
case of audible vibrations or squeak.
►
Make a visual leak test of the cooling circuit for liquid-cooled inverters.
