Chapter 1 Introduction|CFP2000 Series
1-8
Remove the built-in EMC Filter:
In some specific power system, the shunt capacitors might cause damage on motor drive or
electrically charge the enclosure to cause electrical shock. In view of the considerations above,
here are the recommendations on jumper/ screw installation of three power systems:
jumper/screw TN-S System TT System IT System
RFI-1 Keep Keep Remove
RFI-2 Keep Remove Remove
Note1: If any of the RFI is removed, the EMC effect will be affected.
Note 2: Using a LCB (leakage circuit breaker) designed for motor drive is recommended. If a
LCB has tripped, remove the RFI-2 (jumper/ screw) or contact an authorized dealer
of Delta near you.
Note 3: Earthing Systems
The international standard IEC60364 distinguishes three different earthing system categories,
using the two-letter codes TN, TT, IT.
The first letter indicates the type of earthing for the power supply equipment (generator or
transformer).
T: One or more points of the power supply equipment are connected directly to the same
earthing point.
I: Either no point is connected to earth (isolated) or it is connected to earth via a high
impedance.
The second letter indicates the connection between earth and the power supply equipment.
T: Connected directly to earth (This earthing point is separate from other earthing points in
the power supply system.)
N: Connected to earth via the conductor that is provided by the power supply system
Isolating main power from ground:
When the power distribution system of the Power Regenerative Unit is a floating ground system (IT) or an
asymmetric ground system (TN), the RFI short short-circuit cable must be cut off. Cutting off the
short-circuit cable cuts off the internal RFI capacitor (filter capacitor) between the system's frame and the
central circuits to avoid damaging the central circuits and (according to IEC 61800-3) reduce the ground
leakage current.
Important points regarding ground connection
; To ensure the safety of personnel, proper operation, and to reduce electromagnetic radiation, the
Power Regenerative Unit must be properly grounded during installation.
; The diameter of the cables must meet the size specified by safety regulations.
; The shielded cable must be connected to the ground of the Power Regenerative Unit to meet safety
regulations.
; The shielded cable can only be used as the ground for equipment when the aforementioned points are
met.
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