Electrical Connection - KEB combivert R6-S Instruction Manual

Safety Instructions
2.3

Electrical connection

Note Capacitor
Discharge Time
Secure
Isolation
Voltage With
Respect To
Ground
Grounded Delta
Supply
Only Fixed
Connection
Insulation
Measurement
Before any installation and connection work, the system must be switched off and secured.
After switch off, the intermediate circuit capacitors are still charged with high voltage for a
short period of time. The unit can be worked on after it has been switched off for 5 minutes.
The terminals of the control terminal strip are securely isolated in accordance with EN
61800-5-1. With existing or newly wired circuits the person installing the units or machines
must ensure the EN requirements are met. When used together with frequency inverters that
are not isolated from the supply circuit, all control lines must be secured by other protective
measures (e.g. double insulation or shielded, earthed and insulated).
Connection of the COMBIVERT R6 is only permissible on symmetrical networks with a
maximum line voltage (L1, L2, L3) with respect to ground (N/GND) of 317V. An isolating
transformer must be used for networks which exceed this value! The unit may be damaged
if this is not observed.
Connection of the R6 series inverters to voltage systems confi gured as a corner grounded
delta, center tap grounded delta, open delta, or ungrounded delta may defeat the internal
noise suppression of the inverter. Increased high frequency disturbance in the controller
and on the line may be experienced. A balanced, neutral grounded wye connection
is required. The three phase voltage imbalance must be less than 2% phase-to-phase.
Greater imbalance can lead to damage of the inverter's power circuit.
It is acceptable to use a transformer with a WYE connection on the secondary.
Example of a center grounded wye transformer:
x x
1 2
x
0
x
3
The COMBIVERT R6 is designed for fi xed connection only as high frequency ground leakage
currents of > 3.5 mA may occur especially when using EMI fi lters. It is therefore necessary
to use a ground conductor with a section of at least a #4 AWG (16mm
a second ground conductor in compliance with EN 61800-5-1. Ground point-to-point with the
shortest connection possible to the main ground point in the system (avoid ground loops).
When doing a high voltage insulation measurement in accordance with VDE 0100 / Part
620, the power semiconductor of the unit and existing radio interference fi lters must be
disconnected because of the danger of destruction. This is permissible in compliance with
the standard, since all units are given a high voltage test during the quality testing at KEB in
accordance with EN 50178.
) copper conductor or
2
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