u Cooling Fan Replacement: 2A0143 to 2A0273, 4A0156 to 4A0240WARNING! Electrical Shock Hazard. Do not connect or disconnect wiring while the power is on. Failure to comply can result in seriouspersonal injury. Before servicing, disconnect all power to the equipment. The internal capacitor remains charged even after the power supplyis turned off. The charge indicator LED will extinguish when the DC bus voltage is below 50 Vdc. To prevent electric shock, wait for at leastthe time specified on the warning label, once all indicators are OFF, measure for unsafe voltages to confirm the drive is safe prior to servicing.CAUTION! Burn Hazard. Do not touch a hot drive heatsink. Failure to comply could result in minor or moderate injury. Shut off the powerto the drive when replacing the cooling fan. To prevent burns, wait at least 15 minutes and ensure the heatsink has cooled down.NOTICE: Follow cooling fan and circulation fan replacement instructions. Improper fan replacement may cause damage to equipment. Wheninstalling the replacement fan into the drive, make sure the fan is facing upwards. Replace all fans when performing maintenance to helpensure maximum useful product life.n Removing and Disassembling the Cooling Fan Unit: 2A0143 to 2A0273, 4A0156 to 4A02401. Remove the covers.ABDCBDCA – Fan unitB – Ground cablesC – Fan cablesD – Relay connectorsFigure 7.39 Cooling Fan Replacement: 2A0143 to 2A0273, 4A0156 to 4A02402. Pull out the two relay connectors and loosen the ground cable caps to remove the fan cables.ACCDDBBA – Relay connectorsB – CapsC – Ground cablesD – Remove the fan cablesFigure 7.40 Remove the Relay Connector and Loosen the Cable Ground: 2A0143 to 2A0273, 4A0156 to 4A02403. Remove the screws holding the cooling fan unit in place and slide the fan unit out of the drive.7.5 Drive Cooling Fans292 YASKAWA ELECTRIC SIEP YAIZ1B 01E YASKAWA AC Drive – Z1000 Bypass Technical Manual
