Eaton QD5 Manual

Also see for COOPER POWER SERIES: Installation and operation instructions Installation instructions Installation instructions Installation and operation instructions Operation instructions

Contents

Eaton QD5 Manual Manual pdf 6 page image

Holding switchEaton's tap-changers are equipped with a holding switchto assure that a tap-changer operation is completed. Thisswitch also provides a repetitive and accurate openingaction causing the motor to stop the drive componentswith correct alignment. A signal from the holding switchactivates the operations counter and prevents time delayreset during a tap change. The holding switch is operated bya pinion cam causing the holding switch lever to close in oneither the raise or lower micro switch.If there is a problem with one of the micro switches on theholding switch, the individual micro switch should not bereplaced. Instead, the complete holding-switch assemblymust be replaced. Replacement of an individual microswitch can cause alignment problems which will affectthe operation of the tap-changer. Special fixtures are usedto assemble the holding-switch assembly to ensure thatalignment gap setting requirements are met.Motor capacitorThe QD5 tap-changer motor uses a 50 μF, 440 Vac, and100°C motor capacitor. The motor capacitor is not part ofthe tap-changer assembly; it will be located in the voltageregulator control box.Motor capacitorSize Rating50 μF, 440 Vac, 100°C for 50 and 60 HertzIt is recommended that a replacement capacitor be of thesame size and rating as was originally supplied with the unit.Incorrectly sized motor capacitors can cause the motor tolabor and not run properly or at all; premature motor failurewill result. Tap position tracking of the voltage regulatorcontrol will also be adversely affected by improperly sizedmotor capacitors.Figure 2. Motor capacitor.Figure 3. Holding switch assembly.2QD5 QUIK-DRIVE TAP-CHANGER INSTALLATION AND MAINTENANCE INSTRUCTIONS MN225012EN March 2016