Yaskawa F7 Drive CIMR-F7U4132

Warning: This procedure should be performed by a trained technician

Standard replacement period is based on the following usage conditions: Ambient temperature: Yearly average of 86°F / 30°C, Load factor: 80% maximum, Operating time: 12 hours maximum per day

New control power fuse installed

Check the following items during periodic maintenance:

- The motor should not be vibrating or making unusual noises.

- There should be no abnormal heat generation from the Drive or motor.

- The ambient temperature should be within the Drive specification of -10°C to 40°C (14°F to 104°F).

- The output current value shown on U1-03 should not be higher than the motor or Drive rated current for an extended period of time.

- The cooling fan in the Drive should be operating normally.

Before attempting any maintenance checks, make sure that:

- The three-phase power is disconnected and locked out. With power removed from the unit, the DC bus capacitors will stay charged for several minutes.

- The Charge LED in the Drive will glow red until the DC bus voltage is below 10Vdc. To ensure that the DC bus is completely discharged, measure between the positive and negative bus with a DC voltmeter set to the highest scale.

Check ambient temperature, humidity, dust, harmful gas, and oil mist.

Check for abnormal vibration or noise in the equipment.

Inspect the main circuit and control voltage of the AC power supply.

Check transformers and reactors for discoloration or noise.

Inspect the Cooling Fans/Fins & Heatsink for abnormal fan noise and accumulation.

Check the digital operator for LED functionality, monitor display values.

Note: If the Drive is used under the following conditions, it may be necessary to inspect more often:

Select the conditions under which the Drive is used

Sign off on the F7 Drive inspection

Warning: This inspection requires trained personnel with PPE!

Inspect conductors and wire connections for loose lugs, screws, wires, hot spots, corrosion, bent conductors, breakage, cracking, discoloration, and spacing

Inspect terminal blocks for looseness or damage

Check DC bus capacitors for leakage, ruptures, expansion, capacitance, and insulation resistance

Inspect relays and contactors for noise and contact discoloration

Check soft charge resistors for cracks and discoloration

Check control circuit operation, including speed reference voltage/current and I/O contact operation

Inspect the Cooling Fans/Fins & Heatsink for loose connectors

Check the digital operator for key functionality, and cleanliness

These Drives have an internal cooling fan assembly and a heatsink cooling fan assembly. The heatsink cooling fan assembly is attached to the top of the heatsink inside the Drive. The cooling fan(s) can be replaced without removing the Drive from the installation panel.

Removing the Heatsink Cooling Fan Assembly

1. Turn off the input power before removing and installing the heatsink cooling fan assembly.

2. Remove the terminal cover, Drive cover, Digital Operator, and front cover from the front of the Drive.

3. Remove the Control PCB bracket (if necessary) to which the cards are mounted; Remove all cables connected to the Control PCB and remove the cooling fan power connector from the fan board (13 PCB) positioned near the top of the Drive.

4. Remove the cooling fan power connectors from the gate drive board (3PCB) positioned at the back of the Drive.

5. Remove the fan assembly screws and pull out the fan assembly from the Drive.

6. Remove the cooling fan(s) from the fan assembly.

Mounting the Heatsink Cooling Fan Assembly