Delta CFP2000 Series User Manual page 19

Chapter 1 IntroductionCFP2000
Remove the built-in EMC Filter:
In some specific power system, the shunt capacitors might cause damage to the motor drive or
electrically charge the enclosure to cause electrical shock. Because of this, follow these
recommendations for jumper / screw installation of these three power systems:
Jumper/screw
RFI-1
RFI-2
Note1: If any of the RFIs is removed, the EMC effect is affected.
Note 2: Using a LCB (leakage circuit breaker) designed for a motor drive is recommended. If an LCB
has tripped, remove the RFI-2 (jumper/ screw) or contact an authorized Delta dealer near
you.
Note 3: Grounding Systems
The international standard IEC60364 distinguishes three different grounding system categories,
using the two-letter codes TN, TT, IT.
The first letter indicates the type of grounding for the power supply equipment (generator or transformer).
T: One or more points on the power supply equipment are connected directly to the same grounding point.
I: Either no point is connected to ground (isolated) or it is connected to ground with high impedance.
The second letter indicates the connection between ground and the power supply equipment.
T: Connected directly to ground. This grounding point is separated from other grounding points in the
power supply.
N: Connected to ground by the conductor that is provided by the power supply system
Isolating main power from ground:
When the power distribution system of the drive is a floating ground system (IT Systems) or an
asymmetric ground system (Corner Grounded TN Systems), you must remove the RFI Jumper.
Removing the RFI Jumper disconnects the internal capacitors from ground to avoid damaging the internal
circuits and to reduce the ground leakage current.
Important points regarding ground connection:
 To ensure the safety of personnel, proper operation, and to reduce electromagnetic radiation, you
must properly ground the drive during installation.
 The diameter of the cables must comply with the local safety regulations.
 The shield of shielded cables must be connected to the ground of the drive to meet safety regulations.
 The shield of shielded power cables can only be used as the ground for equipment when the
aforementioned points are met.
 When installing more drives, do not connect the grounds of the drives in series but connect each drive
to ground. The following pictures show the correct and wrong ways to connect the grounds.
Figure 1-9
TN-S System
Keep
Keep
1-10
TT System
Keep
Remove
Figure 1-10
IT System
Remove
Remove