Electrical Installation; Grounding The Drive - Invertek Drives Eco Optidrive Series User Manual

4. Electrical Installation

4.1. Grounding the Drive

This manual is intended as a guide for proper installation. Invertek Drives Ltd cannot assume responsibility for the
compliance or the non-compliance to any code, national, local or otherwise, for the proper installation of this drive or
associated equipment. A hazard of personal injury and/or equipment damage exists if codes are ignored during installation.
This Optidrive contains high voltage capacitors that take time to discharge after removal of the main supply. Before working
on the drive, ensure isolation of the main supply from line inputs. Wait ten (10) minutes for the capacitors to discharge to
safe voltage levels. Failure to observe this precaution could result in severe bodily injury or loss of life.
Only qualified electrical personnel familiar with the construction and operation of this equipment and the hazards involved
should install, adjust, operate, or service this equipment. Read and understand this manual and other applicable manuals in
their entirety before proceeding. Failure to observe this precaution could result in severe bodily injury or loss of life.
4.1.1. Grounding Guidelines
The ground terminal of each Optidrive should be individually connected DIRECTLY to the site ground bus bar (through the external EMC filter
if one is installed). Optidrive ground connections should not loop from one drive to another, or to, or from any other equipment. Ground
loop impedance must confirm to local industrial safety regulations. To meet UL regulations, UL approved ring crimp terminals should be used
for all ground wiring connections. The integrity of all ground connections should be checked periodically.
4.1.2. Protective Earth Conductor
The Cross sectional area of the PE Conductor must be at least equal to that of the incoming supply conductor.
4.1.3. Motor Ground
The motor ground must be connected to one of the ground terminals on the drive.
4.1.4. Ground Fault Monitoring
As with all inverters, a leakage current to earth can exist. The Optidrive is designed to produce the minimum possible leakage current whilst
complying with worldwide standards. The level of current is affected by motor cable length and type, the effective switching frequency, the
earth connections used and the type of RFI filter installed. If an ELCB (Earth Leakage Circuit Breaker) is to be used, the following conditions
apply: -

A Type B Device must be used

The device must be suitable for protecting equipment with a DC component in the leakage current

Individual ELCBs should be used for each Optidrive
Drives with an EMC filter have an inherently higher leakage current to Ground (Earth).
The Optidrive product range has input supply voltage surge suppression components fitted to protect the drive from line voltage transients,
typically originating from lightning strikes or switching of high power equipment on the same supply.
4.1.5. Shield Termination (Cable Screen) – IP20 & IP66 Units
For best EMC performance and compliance with EMC directives when using enclosed drives, the power and motor cable shields should be
connected to the cable shield / gland plate using a suitable EMC gland, ensuring direct metal to metal contact between the cable shield and
the gland.
www.microlectra.nl
Optidrive Eco User Guide Revision 2.01
Ensure that the cable sheath is removed
where the shield passes through the gland,
and 360ᵒ metal to metal contact is
maintained.
Gland Plate
EMC Cable Gland
Shielded Cable
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