Powell Power/Vac ML-17 Operator'S Manual Download Page 8

Page: 8 / 33

A. S

cope

The information in this instruction bulletin

describes the following Power/Vac

Electrical

Ground and Test Devices

• 50kA and below, using the 49A or 69A

vacuum bottle, equipped with Revision 1

ML-17 operating mechanism

• 63kA using the 68A vacuum bottle,

equipped with Revision 1 ML-17 operating

mechanism

The “Revision 1” mechanism can be identified

by the “1” in the 8th position of the catalog

number as shown on the nameplate,

i.e., GEPVEGT1xxxxxxxxx.

ML-17/49A and ML-17/69A devices include:

• GMV 1050

• GMV 1051

• GMV 1052

• GMV 1053

• GMV 1054

• GMV 1055

• GMV 1060

• GMV 1061

ML-17H/68A devices include:

• EGT-63-A

• EGT-63-B

B. p

urpoSe

The information in this instruction bulletin is

intended to provide information required to

properly operate and maintain the

ground and test device described in

Ch 1 General Information,

A. S

cope

This instruction bulletin provides:

1. Safety guidelines

2. General descriptions of the operation and

maintenance of the ground and test device

3. Instructions for installation and placing the

ground and test device into service

4. Instructions for part replacement

5. Information for ordering renewal parts

6. Procedure for critical adjustments

7. Illustrations, photographs, and description

of the ground and test device

The illustrations contained in this document

may not represent the exact construction

details of each particular type of ground and

test device. The illustrations in this document

are provided as general information to aid in

showing component locations only.

All illustrations and photos are shown using

deenergized equipment.

Be sure to follow the appropriate safety

precaution while handling any of the

equipment. Failure to do so may result in

serious injury or death.

WARNING

To the extent required, the products described

herein meet the applicable ANSI, IEEE, and

NEMA Standards; however, no such assurance

is given with respect to local codes and

ordinances which may vary greatly.

Powered by Safety

General Information

Power/Vac® Electrical Ground and Test Devices

Equipped with ML-17 Mechansim

01.4IB.50100

Summary of Contents for Power/Vac ML-17

Page 1: ...01 4IB 50100 Power Vac ML 17 Mechanism For use with all Power Vac Electrical Ground and Test Devices Powered by Safety ...

Page 2: ...stems Inc www powellind com info powellind com Service Division PO Box 12818 Houston Texas 77217 2818 Tel 713 944 6900 Fax 713 948 4569 Powered by Safety Power Vac Electrical Ground and Test Devices Equipped with ML 17 Mechansim 01 4IB 50100 ...

Page 3: ...sed to address practices not related to personal injury CAUTION NOTICE NOTICE is used to address practices not related to personal injury Qualified Person For the purposes of this manual a qualified person as stated in NFPA 70E is one who has skills and knowledge related to the construction and operation of the electrical equipment and installations and has received safety training to recognize an...

Page 4: ...tion 8 4 Trip Free Operation 12 D Interlocks 12 1 Closing Spring Discharge Interlock 12 2 Negative Trip Interlock 12 3 Positive Interlock 12 4 Closing Spring Gag Interlock 12 Ch 4 Installation 13 A Receiving 13 B Handling 13 C Storage 13 D Shipping Position 14 Ch 5 Mechanical Checks and Adjustments 15 A General 15 B Slow Closing Operation 15 C Pull Rod Adjustment 17 D Trip Latch Clearance 17 E Ove...

Page 5: ...uit Resistance 22 4 Vacuum Interrupter Integrity Test 23 Ch 7 Maintenance 25 A Recommended Maintenance 25 B Lubrication 25 Ch 8 Recommended Renewal Parts and Replacement Procedures 26 A Ordering Instructions 26 Powered by Safety ii Power Vac Electrical Ground and Test Devices Equipped with ML 17 Mechansim 01 4IB 50100 ...

Page 6: ...0 Figure 3 Toggle Linkage Positions of ML 17 Mechanism View from Rear 11 Figure 4 Lifting Holes for Overhead Crane 13 Figure 5 Closing Spring Gag Lock 16 Figure 6 Slow Close Pin on Flywheel 16 Figure 7 Primary Contact Gap and Erosion Indication 18 Figure 8 Wipe Gauge 19 Table A Wipe and Gap Measurements 19 Powered by Safety iii 01 4IB 50100 ...

Page 7: ...ontact with the electrical working components or wiring of this equipment the power supply must be disconnected Failure to follow this warning may result in injury or death WARNING The information in this instruction bulletin is not intended to explain all details or variations of the Powell equipment nor to provide for every possible contingency or hazard to be met in connection with installation...

Page 8: ...tenance of the ground and test device 3 Instructions for installation and placing the ground and test device into service 4 Instructions for part replacement 5 Information for ordering renewal parts 6 Procedure for critical adjustments 7 Illustrations photographs and description of the ground and test device The illustrations contained in this document may not represent the exact construction deta...

Page 9: ...ction bulletin for the Powell equipment NOTICE For more information visit www powellind com To contact the Powell Service Division call 1 800 480 7273 or 713 944 6900 or email info powellservice com For specific questions or comments pertaining to this instruction bulletin email documents powellind com with the IB number in the subject line Powered by Safety 3 General Information 01 4IB 50100 ...

Page 10: ...s for voltage measurement and test instruments intended for use on electrical systems 1000 V and below 6 Where the possibility of induced voltages or stored electrical energy exists ground the phase conductors or circuit parts before touching them Where it could be reasonably anticipated that the conductors or circuit parts being deenergized could contact other exposed energized conductors or circ...

Page 11: ...ety precautions must be observed 1 Do not attempt to ground an energized circuit The circuit to be grounded should always be treated as energized until proven otherwise 2 Do not attempt to service the device while it is installed in a switchgear compartment or on a lift truck For service the device must be located either on the floor or on a sturdy level work bench and blocked from rolling 3 Store...

Page 12: ... charge the opening springs and overcome bearing and other friction forces The energy then stored in the wipe springs and opening springs will open the contacts during an opening operation Closing and opening operations are controlled electrically by a remote control cable attached to the front of the ground and test device For maintenance and checkout the closing spring may be manually charged an...

Page 13: ...e by pushing on rod Figure 1 13 As the line of action of the close spring shifts over center on the flywheel and attempts to discharge the close roller Figure 1 3 is blocked by the close latch Figure 1 4 and held until a closing operation is required Additionally as the close spring goes over center the switch operator Figure 2 44 is spring biased into a notch on the front flywheel Figure 1 2 The ...

Page 14: ... closed position the links Figure 1 17 can move up past the close toggle without disturbing it as they are slotted to accommodate a close spring charged ground and test device closed the toggle linkage appears as shown in Figure 3 c 3 Opening Operation By either energizing the trip solenoid or depressing the manual trip button the trip latch Figure 1 18 is rotated clockwise permitting the trip tog...

Page 15: ...in Closing Spring Assembly 8 Hex Shaft with Connection Blocks on Flywheel 9 Wind Pawl 10 Slow Close Pawl 11 Wind Hub 12 Pawl Disengagement Cam Surface On Frame 13 Pull Rod 14 Adjustable Throw Transfer Crank 15 Adjustment Link Factory Adjustment Only 16 Short Transfer Crank 17 Slotted Link 18 Trip Latch 19 Link Trip Toggle to Frame 20 Link from Close Toggle to Trip Toggle Figure 1 Typical Schematic...

Page 16: ...ink 36 Switch Drive Arm 37 Auxiliary Switch 38 Position Indicator Flag 39 Operation Counter 40 Spring Charge Indicator Arm 41 Rod 42 Spring Charge Discharge Indicator Flag 43 Gear Motor Limit Switch 44 Gear Motor Limit Switch Operator 45 Gear Motor 46 Gear Motor Housing 47 Trip Latch Checking Switch 48 Slow Close Pin 49 Retaining Clamp 50 Opening Stop 51 Toggle Pin 52 Trip Roller 53 Horizontal Bar...

Page 17: ... 9 8 6 5 7 1 2 10 3 4 9 8 6 5 7 1 2 10 3 4 9 8 6 5 7 1 Output Crank 2 Link Output Crank to Close Toggle 3 Link Close Toggle to Trip Toggle 4 Link Trip Toggle to Frame 5 Trip Latch 6 Slotted Link 7 Transfer Crank 8 Trip Roller 9 Linkage Return Spring 10 Toggle Pin Figure 3 Toggle Linkage Positions of ML 17 Mechanism View from Rear Powered by Safety 11 Equipment Description 01 4IB 50100 ...

Page 18: ...h roller thereby preventing a closing operation The interlock also opens the latch checking switch 52LCS in the closing circuit thereby removing the close circuit power The negative interlock is in operation while the ground and test device is moving between the Disconnect Test position and the Connect position A redundant negative trip interlock is a backup to the negative trip interlock and prov...

Page 19: ... test device When rolling the ground and test device it should be pushed and steered by the steel frame or the front cover Do not handle or move the ground and test device by the primary disconnecting devices as damage may occur CAUTION If necessary the ground and test device can be moved by a fork lift truck or an overhead crane When using a fork lift truck take care to avoid components located u...

Page 20: ...rational integrity 2 Equipment designed for outdoor exposure may be stored either in indoor or outdoor storage locations The equipment must be protected from airborne external contaminates if stored outdoors Outdoor storage will also require additional care to maintain temporary covers over the openings and shipping splits The equipment must be provided with control power to facilitate the energiz...

Page 21: ...ir procedures require removal of the front cover The serial number is also attached to the right side ground and test device frame between the track rollers on an engraved metal plate Verify that the serial number on the removable front cover matches the number affixed to the frame before reassembly NOTICE B Slow Closing Operation Slow closing the ground and test device allows observation of the m...

Page 22: ...g the manual wind shaft Be sure the close toggle pin Figure 2 51 goes over center and the spacers on the ends of the pin rest against the frame After the one half flywheel rotation necessary for closing the slow close pawl is automatically disengaged Figure 5 Closing Spring Gag Lock a b c d e a Close Spring Interlock Lever b Close Spring Blocking Pin c Storage Hole d Blocking Hole under lever e In...

Page 23: ...35 ft lbs of torque If the pull rod is too short i e slotted link is too tight against the pin in the closed toggle the pin may be bent and require replacement CAUTION D Trip Latch Clearance Refer to items 5 8 in Figure 3 a Charge and gag the close spring as described in steps 1 2 of Ch 5 Mechanical Checks and Adjustments B Slow Closing Operation With the ground and test device open determine the ...

Page 24: ...t currents and to supply the propelling energy required to attain the correct opening speed needed for a clean interruption of the current Gap is the distance between the two vacuum interrupter contacts when the ground and test device is open Correct adjustment of the gap assures that the minimum required distance for current interruption is achieved and that the distance is not so great that mech...

Page 25: ...vice mechanism frame draw a line on the tape to indicate the position when the ground and test device is closed Leave the tape in place Then in step f draw another line on the tape when the ground and test device is opened The distance between these lines is the gap for that phase d Remove the trip latch blocking bolt installed in step a and open the ground and test device by pushing the manual tr...

Page 26: ... 15 16 wrench e Decrease the wipe and increase the gap a like amount by turning the operating rod down clockwise looking from the top or increase the wipe while decreasing the gap by turning the operating rod up counterclockwise looking from the top Note The operating rod has 11 threads per inch so that 1 6 turn one flat of the operating rod hex will result in approximately 015 change in wipe and ...

Page 27: ... to normal by performing wipe adjustment When erosion reaches 1 8 the misalignment of the indicator disc and the reference arm with the ground and test device closed the interrupter should be replaced If an appreciable amount but not more than 1 8 of erosion is indicated estimate the amount of interrupter life remaining before the 1 8 limit will be reached Recheck the erosion indicator before reac...

Page 28: ...If the test should experience a failure STOP turn off the test set and discharge the ground and test device 1 Check the test set up and leads for connection errors 2 Wipe down the ground and test device to remove any moisture dust and contamination 3 Retest the ground and test device at the proper test voltage 2 Secondary Circuit Prior to hipotting the ground and test device secondary circuit disc...

Page 29: ...mended open position ground and test device contact gap CAUTION A vacuum integrity test of the interrupter is required to ensure that no loss of vacuum has occurred The vacuum integrity test is performed using an AC hi potential tester This test of the vacuum interrupter will determine its internal dielectric condition and vacuum integrity With the ground and test device open individually check ea...

Page 30: ...h potential test can also be conducted on the vacuum interrupter If a DC hipot test is to be used test voltage should not exceed 50kVDC and should be applied for 10 seconds Interrupters must be cleaned as previously discussed If failure occurs reverse the polarity and retest If the interrupter passes the second test STOP The interrupter is acceptable If the interrupter fails the second test it is ...

Page 31: ...vals is helpful in extending the useful life of the ground and test device mechanism especially where frequent operation may have forced lubricant out of the bearing surfaces Use Mobile 29 black grease 0282A2048P005 on all mechanical bearings and sliding surfaces in the Power Vac mechanism This grease contains extreme pressure EP additives to improve its load bearing capability Use the standard re...

Page 32: ...in 01 4IB 66000B for renewal parts and replacement procedures Specify the quantity and description of the part and the instruction bulletin number If the part is in any of the recommended renewal parts tables specify the catalog number If the part is not in any of the tables a description should be accompanied by a marked illustration from this instruction bulletin a photo or simply submit a sketc...

Page 33: ...Houston PO Box 12818 Houston TX 77217 Tel 713 944 6900 Fax 713 948 4569 www powellind com info powellind com 2006 Powell Industries Inc All rights reserved For use with all Power Vac Electrical Ground and Test Devices 01 4IB 50100 Power Vac ML 17 Mechanism July 2014 ...

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