Yaskawa F7 Drive User Manual Bedienungsanleitung PDF herunterladen (Seite 154)

Diagnostics & Troubleshooting 6 - 29

Table 6.6 Main Circuit Test Procedure (continued)

Check Procedure

Input Diodes

(D1-D12 or Q1)

12. Place the positive (red) meter lead on terminal ⊕ 1.

Place the negative (black) meter lead on terminal S/L2.

Expected reading is OL displayed.

13. Place the positive (red) meter lead on terminal ⊕ 1.

Place the negative (black) meter lead on terminal T/L3.

Expected reading is OL displayed.

Soft Charge Resistor Check

(R1, R2, 6PCB)

The soft charge resistor works in conjunction with the soft charge contactor to slowly charge the

DC bus capacitors to minimize the inrush current when power is applied to the Drive.

1. Conduct a visual inspection. Check for physical damage.

2. Set a digital multi-meter to the R x 1 scale.

3. If the resistor is damaged, the measured value will be infinite

Ω.

Soft Charge Contactor

(K1)

The purpose of the soft charge contactor is to bypass the soft charge resistor after the DC bus

voltage has reached its normal operating level.

1. Conduct a visual inspection. Check for physical damage.

2. Set a digital multi-meter to the R x 1 scale.

3. On Drives with a board-mounted contactor, verify that each contact resistance measures

infinite

Ω.

4. On Drives without a board-mounted contactor, press the plunger in, and verify that each

contact measures 0

Ω.

5. On Drives without a board-mounted contactor, release the plunger, and verify that the

resistance is the ohmic value of the soft charge resistor.

On Drives with a board-mounted contactor, verify that the contactor coil measures about 300

e coil can be tested by applying the appropriate voltage to verify the contacts change states.

7. On Drives without a board-mounted contactor, verify that the 230Vac contactor coil

measures about 175

Ω. The coil can be tested by applying the appropriate voltage to verify the

contacts change states.

8. On Drives without a board-mounted contactor, verify that the 24Vdc auxiliary coil measures

about 2.2M

Ω. The coil can be tested by applying the appropriate voltage to verify the

contacts change states.

DC Bus Fuse

(F1)

The DC bus fuse is located in the negative portion of the DC Bus. The DC bus fuse is used to

protect the main circuit components if the output transistors short. If the DC bus fuse is open, at

least one of the output transistors has failed. When a transistor fails, there is a short between the

positive and negative portions of the DC Bus. The DC bus fuse does not protect the transistors, but

protects the rest of the main circuit from the high current present during a short. Never replace the

DC bus fuse without first checking all of the output transistors.

1. Set a digital multi-meter to the R x 1 scale.

2. Place one lead of the multi-meter on one side of the fuse and place the other lead of the multi-

meter on the other side of the fuse.

3. If the fuse is good, the measured value will be 0

Ω.

If the fuse is bad, the measured value will be infinite

Ω.

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