2
Safety notes
Operation and service
Operating Instructions Basic Unit – MOVITRAC
®
B
7
2.2
Operation and service
• Disconnect the unit from power supply before you remove the protective cover.
Dangerous voltages may still be present for up to ten minutes after disconnection
from the power supply source.
• When the unit switch is in the ON position, dangerous voltages are present at the
output terminals as well as any connected cables and motor terminals. Dangerous
voltages may even occur if the unit is inhibited and the motor is at standstill.
• The unit may not necessarily be free from any voltages even if the displays are no
longer illuminated.
• Switch the frequency inverter output with inhibited output stage only.
• Ensure a minimum time of 120 s between two mains activations for AC 230 V /
1-phase units.
• Observe a minimum switch-off time of 10 s for 3-phase units.
• The unit has IP00 enclosure with the protective cover removed. Dangerous voltages
are present at all subassemblies except for the control electronics. The unit must be
closed during operation.
• Safety functions of the unit or mechanical blocking may result in a motor standstill.
Removing the cause of this problem or performing a reset can result in the drive re-
starting on its own. If, for safety reasons, this is not permitted for the driven machine,
disconnect the unit from the mains before correcting the fault.
Risk of burns
Braking resistors have surface temperatures of up to 250 °C.
