Safeline STANDARD SERIES, Instruction Manual

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Page 61
RECOMMENDATIONS FOR THE USE OF INVERTERS
This is a typical layout of the inverter supplied by safeline.
Do attempt to install, operate, maintain or inspect the inverter until you have read through
the instruction manual supplied with the inverter.
Safeline use Mitsubishi as our supplier of inverters, we know this works well with the metal detector
and we have carried out extensive tests to meet the requirements of the CE regulations.
General counter measures.
1. Keep wiring inside control box as far away from inverter as possible.
2. Motor cables should be run separate from any other cables and as far from
the metal detector as possible.
3. External screened cables should be grounded at suitable intervals where possible.
4. Remove insulation only where screening clamps are shown to provide good earth
continuity at that point.
5. Do not run the power cables(I/O cables) and signal cables of the inverter in parallel
with each other and do not bundle them.
6. Use twisted shield cables for the detector connecting and the control signals.
7. Ground inverter, motor, etc. at one point.
8. Capacitances exist between the inverter’s I/O wiring, other cables, earth and motor, through
which leakage currents flow to cause the earth leakage circuit breaker, earth leakage relay to
operate unnecessarily.
To prevent this. take appropriate measures, e.g. set the carrier frequency to a lower value, use
earth leakage circuit breaker designed for suppression of harmonics and surges, and use the
electronic overcurrent protection built in the inverter.