Lenze 8200 motec frequency inverter 0.25kW-7.5kW - Manual (Page 28)

Installation
Electrical installation − Important notes
4−3
L
EDB82MV752 EN 5.2
4.2 Electrical installation
4.2.1 Important notes
Stop !
The controller contains electrostatic sensitive devices!
Before working in the connection area, the personnel must be free of electrostatic charges.
4.2.1.1 Protection of persons
Danger!
Before working on the controller, check whether all power terminals (device version 001 or 151) and
the pins of the FIF interface are dead, because
·
the power terminals U, V, W, BR0, BR1, BR2 and the pins of the FIF interface remain live for at
least 1 minute after power−off.
·
the power terminals L1, L2, L3; U, V, W, BR0, BR1, BR2 and the pins of the FIF interface
remain live when the motor is stopped.
·
the relay outputs K11, K12, K14 (device version 001 or 151) can be live if the controller is
disconnected from the mains.
Use of earth−leakage circuit breakers ( ^ 4−5)
Pluggable terminal strips
Plug in or pull off all pluggable terminals in deenergised state only!
Replacing defective fuses
Replace defective fuses with the prescribed type only when no voltage is applied.
Disconnecting the controller from the mains
The controller can be safely disconnected from the mains only via a contactor on the input side.
4.2.1.2 Motor protection
·
Extensive protection against overload:
– By overcurrent relay or temperature monitoring.
– We recommend to use PTC thermistors or thermal contacts for motor temperature
monitoring. (Lenze three−phase AC motors are equipped with thermal contacts (NC
contacts) as standard)
– PTC thermistors or thermal contacts can be connected to the controller.
·
Only use motors the insulation of which is suitable for inverter operation:
– Insulation resistance: min. û = 1.5 kV, min. du/dt = 5 kV/
μs
– Lenze three−phase AC motors are designed for inverter operation.
– When using motors with an unknown insulation resistance, please contact your motor
supplier.