Delta ME300 Series User Manual

Chapter 1 IntroductionME300
1-5
1-5 RFI Jumper
The drive contains Varistors / MOVs that are connected from phase to phase and from phase to ground to
protect the drive against mains surges or voltage spikes.
Because the Varistors / MOVs from phase to ground are connected to ground with the RFI jumper,
removing the RFI jumper disables the protection.
1. In models with a built-in EMC filter, the RFI jumper connects the filter capacitors to ground to form
a
r
eturn path for high frequency noise. This isolates the noise from contaminating the mains power.
Removing the RFI jumper strongly reduces the effect of the built-in EMC filter.
2. Although a single drive complies with the international standards for leakage current, an installati
on
w
ith several drives with built-in EMC filters can trigger the RCD. Removing the RFI jumper can help,
but the EMC performance of each drive is no longer guaranteed.
Frame A–D Screw Torque: 4–6 kg-cm / [3.5–5.2 lb-in.] / [0.39–0.59 Nm]
Loosen the screw and remove the RFI jumper (as shown below). Fasten the screw again after you remove
the RFI jumper.
Frame B–D (model with built-in EMC filter)
Remove the RFI jumper with a screwdriver (as shown below).

Delta ME300 Series Specifications

General

Power Rating	0.4 kW ~ 110 kW
Protection Features	Overcurrent, Overvoltage, Undervoltage, Overtemperature, Short Circuit
Communication	RS-485
Storage Temperature	-20-60°C
Dimensions	Varies by model
Weight	Varies by model
Input Voltage	3-phase 220VAC
Humidity	90% RH, non-condensing