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Cooper VR Series Maintenance Instructions Manual

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Oil Switches
Types VR, VCR, VLR
Maintenance Instructions
Figure 1.
Type VR, VCR and VLR electronically controlled three phase oil switch.
CONTENTS
Introduction . . . . . . . . . . . . . . . . . 1
General Description . . . . . . . . . . 1
Standard Actuator . . . . . . . . . . . . 3
Quick-Close Actuator . . . . . . . . . 4
Maintenance . . . . . . . . . . . . . . . . 5
. . . . . . . . 6
Electrical Operation . . . . . . . . . 6
Standard Actuator . . . . . . . . . 6
Quick-Close Actuator . . . . . . . 6
. . . . . . . . . 6
These instructions do not claim to cover all details or variations in the equipment, procedure, or process described, nor to provide
directions for meeting every contingency during installation, operation, or maintenance. When additional information is desired to
satisfy a problem not covered sufficiently for the user's purpose, please contact your Cooper Power Systems sales engineer.
September 1983
New Issue
Printed in USA
To Close Switch . . . . . . . . .
To open Switch . . . . . . . . . .
Oil Condition . . . . . . . . . . . . . .
Bushings . . . . . . . . . . . . . . . . .
Contacts . . . . . . . . . . . . . . . . .
Type VLR Switches . . . . . . . .
Actuator Mechanism . . . . . . . .
. . . . . . . . . . . .
Motor Replacement . . . . . . .
Speed Reducer . . . . . . . . . .
S260-20-9
Service Information
CAUTION:
Do not energize this
equipment out of oil.
Service Parts List .....................
6
6
(Figure 39) ..........................
6
6
(Figure 40) ..........................
7
7
7
(Figure 41) ..........................
8
(Figure 42) ..........................
11
13
(Figure 43) ..........................
13
14
(Figure 44) ..........................
15
15
17
18
20
21
22
24
26
1

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Summary of Contents for Cooper VR Series

  • Page 1: Table Of Contents

    These instructions do not claim to cover all details or variations in the equipment, procedure, or process described, nor to provide directions for meeting every contingency during installation, operation, or maintenance. When additional information is desired to satisfy a problem not covered sufficiently for the user’s purpose, please contact your Cooper Power Systems sales engineer. September 1983...

  • Page 2: Introduction

    INTRODUCTlON Service Information S260-20-9 covers the maintenance instructions for Types VR VCR, and VLR motor operated oil switches. This includes their general description, operating principles and instructions for periodic inspection, test- ing, trouble shooting and shop repairs. A service parts list, keyed to exploded view drawings of the equipment is included at the back of the manual.

  • Page 3: Description Of Operation

    S260-20-9 DESCRIPTION OF OPERATION Standard Actuator These switches are equipped with a motor-operated actuator mechanism (Figure 5) for remote closing. Remote tripping is accomplished by energizing a trip-open solenoid which unlatches a spring-loaded operating mechanism to open the main switch contacts. Subse- quent closing is accomplished by oper- ating the motor which loads the opening springs, latches the operating mecha-...

  • Page 4: Quick-Close Actuator

    Quick-Close Actuator When equipped with the quick-close actuator (Figure 10) the main switch contacts close in 2.5 to 5 cyc/es after energizing the closing circuit (compared to 10 seconds for the standard opera- tor). However, at least 10 seconds lapse between an opening and closing opera- tion to allow the motor operator to preload the closing springs.

  • Page 5: Ratings And Specifications

    Electrical Ratings matic conditions, maintenance intervals are best determined by the user based Rated maximum voltage (kv rms) 15.5 on actual operating experience. Cooper Nominal system voltage (kv rms) 2.4-14.4 Power Systems recommends the switch Rated impulse withstand voltage be inspected and serviced yearly until...

  • Page 6: Operating Instructions Electrical Operation

    3 and G ditioned transformer oil which conforms taminants to raise the dielectric strength to energize the trip solenoid. to the specifications in Cooper Power to an acceptable level. However, it does Systems Reference Data R280 901, “Oil MANUAL OPERATION not always remove water absorbing Specifications and Test”.

  • Page 7: Shop Repair Procedures

    S260-20-9 TEST 2: Proceed as follows: 1. Close the switch. 2. Ground switch tank and head. 3. Ground the outer two bushings (Phase A and Phase C). 4. Apply test voltage (37.5 kv) to the center bushing (Phase B). • The switch should withstand the test voltage for 60 seconds.

  • Page 8: Type Vr And Vcr Switches

    NOTE: The contact structure for Type VCR switches below serial 1770 uses wedge- shaped contacts for load-carrying as well as arcing. It is strongly recommended that these old-style contact assemblies be replaced with the updated version. A contact assembly kit, KA704VCR is available for this purpose. Three kits are required per switch.
  • Page 9 S260-20-9 3. Inspect the contact support housing D. Replace the damaged assemblies and reassemble the contact rod and contact rod for damage. If to the housing. replacement is not required proceed 4. Reinstall the contact support housing to step 5. If replacement is required, and contact rod.
  • Page 10 D. Unhook the closing spring from the drive stud on the front of the actuator mechanism. Install the manual closing crank and crank clockwise untiI the drive stud reaches 7 o’clock position; approximately 42 revolutions. E. Crank slowly from this point, to bring the moving contacts toward the stationary contacts.

  • Page 11: Type Vlr Switches

    S260-20-9 H. To confir m proper contact engagement, crank the actuator mechanism to the fully closed position. Check clearance between the moving contact bar and the contact rod guide block, Figure 25. Clearance must be between 1/32 and 1/16 inch. If clearance is outside these limits adjust the hex nuts on the bushing rods to move the station-...
  • Page 12 Figure 30. Checking axial and longitudinal squareness with “sailboat” align- ment fixture. maintaining the alignment of step NOTE: A typical sailboat alignment fixture is shown in Figure 31. If a fix- Figure 28. ture is not available the procedure for Type VLR switch contact assembly.

  • Page 13: Actuator Mechanism

    S260-20-9 the number of washers above and below the yoke assembly to obtain the proper clearance. G. Manually trip open the switch and reattach the closing spring. 8. ManualIy operate the switch a few times to observe contact alignment and clearances to verify that all parts have been properly secured.

  • Page 14: Trip Solenoid

    Figure 34. Connection diagram for quick-close operator. TRIP SOLENOlD If the trip solenoid plunger becomes rusted, it can be cleaned with crocus cloth. A severely eroded plunger and/or frame, or a faulty solenoid necessitates the replacement of the entire tr ip solenoid assembly.

  • Page 15: Motor Replacement

    S260-20-9 MOTOR REPLACEMENT The actuator motor used in Type VR, VCR, and VLR switches with serial numbers below those listed in Table 4 is no longer available. To adapt the new motor to these switches a motor replacement kit, KA725VR, is available. The kit includes the new motor and all par ts required for the adaptation.
  • Page 16 5. Remove hexhead screws that secure the speed reducer to the actuator housing. 6. Lift out the speed reducer with toggle assembly and opening spr ings attached as shown in Figure 38. Remove the springs from the lower spring link. 7.

  • Page 17: Service Parts List

    All parts carry the same warranty as parts have been carefully checked so parts used in Cooper Power Systems any whole item of switchgear, i.e. that they may be locally acquired. The switches that may not be readily locally...

  • Page 18: Tank And Head Assembly Parts (Figure 39)

    Figure 39. Tank and head assembly parts.
  • Page 19 S260-20-9 Tank and Head Assembly Parts (Figure 39) Qty. Qty. Item Catalog Item Catalog Description Number Assy. Description Number Assy. Head casting (includes Bushing assembly, complete operating shaft bushing) KA701VR (includes items 6, 7, 8 and 9) Oil seal KP259VR Standard creepage KA160E7 Head gasket...

  • Page 20: Type Vr Contact Assembly Parts (Figure 40)

    Figure 40. Type VR contact assembly parts. Type VR Contact Assembly Parts (Figure 40) Qty. Qty. Item Catalog Item Catalog Description Number Assy. Description Number Assy. Hex jam nut, light, 5/8-18, Contact housing support brass K880725318062A assembly KA211 VR1 Washer KP2028A45 Mounting bracket KP134VR1...

  • Page 21: Type Vcr Contact Assembly Parts (Figure 41)

    S260-20-9 Figure 41. Type VCR contact assembly parts. Type VCR Contact Assembly (Figure 41) Qty. Qty. Item Catalog Item Catalog Description Number Assy. Description Number Assy. Hex jam nut, light, 5/8-18 Double-ended stud KP138VCR brass K88072S318062A Plate, right hand KP127VCR1 Washer KP2028A45 Plate, left hand...

  • Page 22: Type Vlr Contact Assembly Parts (Figure 42)

    Figure 42. Type VLR contact assembly parts.
  • Page 23 S260-20-9 Type VLR Contact Assembly (Figure 42) Qty. Item Catalog Item Catalog Description Number Assy. Description Number Assy. Hex jam nut, light, 5/8-18, Machine screw, rd hd, 10-32 brass K880725318062A x 2-1/2, stl K721501310250A Washer KP2028A4S Split lockwasher, med Split lockwasher, med, 5/8 No.

  • Page 24: Actuator Mechanism Parts (Figure 43)

    Figure 43. Actuator mechanism parts.
  • Page 25 S260-20-9 Actuator Mechanism Parts (Figure 43) Qty. Qty. Item Catalog Item Catalog Description Number Assy. Descrliption Number Assy. Cover KP129VR Plug assembly KA98NR Cover gasket KP2084A1 Terminal strip KP2101A7 Plate, MANUAL TRIP KP245VR Marker KP40VR Plate, OPEN KP730R Machine screw, rd hd, 8-32 Self-tap screw, rd hd, Type Z, x 3/4, stl K721501108075Z...

  • Page 26: Quick-Close Mechanism Parts (Figure 44)

    Figure 44. Quick-close mechanism parts. Type VR Contact Assembly Parts (Figure 40) Qty. Qty. Item Catalog Item Catalog Description Number Assy. Description Number Assy. Bracket KP188VR Bracket KP186VR KP312VR Machine screw, rd hd, 10-32 x 3/4, stl K721501310075Z Machine screw, rd hd, 1/4-20 x 1 /2, stl K721501125050Z Split lockwasher, med, No.
  • Page 28 1989 Cooper Industries, Inc. P.O. Box 2850, Pittsburgh, PA 15230 © 11/83...

This manual is also suitable for:

Vcr seriesVlr series

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