GE AF-300, C11 manual In the case of 3-phase input series, Motor, supply, 4-1 Megger Test

[In the case of 3-phase input series]			[In the case of single -phase
			input series]
+ +	V	–

AR	WR	P(+)
		L1/R
	VR

N(–)

U

AU WU

VU

Motor

supply

AR WR L1/L

AS L2/S

Drive	V
Drive

AV

M

3~

VR

Power supply

VS
AT	WT	L3/T
VT		FM

W

L1

VV

AW WW

VW

Power

L2/N

+V

–

Figure 8-3-1 Diagram for connections of meters

8-4 Insulation Test

As much as possible, do not test the drive with a megger because an insulation test was done at shipping from the factory. If a megger test must be done, test as described below. If the test method is incorrect, there is a pos- sibility of damaging the product. Incorrect use of test specific ations for the dielectric strength test may damage products like megger test. If the dielectric strength test must be conducted, contact your local distributor or near- est GE Fuji’s sales office.

(1)Megger test for the main circuit

1)Test with a 500V dc megger.

2)If the test voltage is connected to the control circuit, remove all connection wires to the control circuit.

3)Connect the main circuit terminals using common wires as shown in Figure 8-4-1

4)Execute a megger test only between the common wire connected to the main circuit and the ground (terminal G).

5)If the megger indicates 5MΩ or more, it is normal.

(This is the value measured with a drive only.)

G			Drive
G
L1/R	L2/S	L3/T	P1 P(+) P(+) N(-) U	V	W
(L1/L)	(None)	(L2/N)

Megger

Figure 8-4-1 Megger Test

Symbols in parentheses ( ) are for the single -phase

230V series.

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