Delta MS300 Manual

Chapter 1 IntroductionMS300
1-7
Asymmetric Ground System (Corner Grounded TN Systems)
Caution: Do not remove the RFI jumper while power to the input terminal of the drive is ON.
In the following four situations, you must remove the RFI jumper. This is to prevent the system from
grounding through the RFI and filter capacitors and damaging the drive.
You must remove the RFI jumper for an asymmetric ground system
1. Grounding at a corner in a triangle configuration
L2
L3
L1
2. Grounding at a midpoint in a polygonal
configuration
L2
L3
L1
3. Grounding at one end in a single-phase
configuration
L
1
N
4. No stable neutral grounding in a three-phase
autotransformer configuration
L
1
L2
L3
L1
L2
L3
You can use the RFI jumper for a symmetrical grounding power system
In a situation with a symmetrical grounding power system, you
can use the RFI jumper to maintain the effect of the built-in
EMC filter and surge absorber. For example, the diagram on
the right is a symmetrical grounding power system.
L2
L3
L
1

Delta MS300 Specifications

General

Series	MS300
Cooling	Fan cooling
IP Rating	IP20
Input Voltage	3-phase 380 ~ 480VAC
Output Current	Varies by model
Overload Capacity	150% of rated current for 60 seconds
Braking Unit	Built-in or optional
Control Method	V/F control, Sensorless Vector Control
Speed Control Range	1:100 (SVC)
Protection Functions	Overcurrent, Overvoltage, Undervoltage, Overheating, Short Circuit
Communication Interface	RS-485
Operating Temperature	-10°C to +50°C
Storage Temperature	-20°C to +60°C
Humidity	90% RH, non-condensing
Dimensions	Varies by model
Weight	Varies by model