Table Of Contents - Hitachi PV-250 Installation Operation & Maintenance

1. INTRODUCTION ............................................................................................................................... 1-1
1.1. Shock Indicators ....................................................................................................................... 1-1
1.2. Description ................................................................................................................................ 1-1
1.2.1. General ......................................................................................................................... 1-1
1.2.2. Coils .............................................................................................................................. 1-1
1.2.3. Contacts ........................................................................................................................ 1-1
1.3. Specifications ............................................................................................................................ 1-2
1.3.1. Electrical ....................................................................................................................... 1-2
1.3.2. Mechanical .................................................................................................................... 1-2
2. INSTALLATION ................................................................................................................................. 2-1
2.1. General ..................................................................................................................................... 2-1
2.1.1. Care in Handling ........................................................................................................... 2-1
2.2. Mounting Base .......................................................................................................................... 2-1
2.3. Relay Indexing .......................................................................................................................... 2-1
2.4. Receptacle Contact Springs ..................................................................................................... 2-3
2.4.1. Old-Style Base Only ...................................................................................................... 2-3
2.4.2. Improved One-Piece Base Only ................................................................................... 2-3
2.4.3. Installing Wires in Receptacle Contact Springs ............................................................ 2-4
2.5. Relay Insertion .......................................................................................................................... 2-5
3. MAINTENANCE ................................................................................................................................. 3-1
3.1. Periodic Performance Test ....................................................................................................... 3-1
3.1.1. Cleaning ........................................................................................................................ 3-1
3.1.2. Service Requirements ................................................................................................... 3-1
3.2. Calibration ................................................................................................................................. 3-1
3.2.1. Recommended Test Equipment ................................................................................... 3-1
3.2.2. Shop Calibration Test Procedure .................................................................................. 3-2
3.2.3. In-Service and Field Calibration Test Procedure .......................................................... 3-5
3.3. Contact Resistance ................................................................................................................... 3-7
3.4. Shop Maintenance .................................................................................................................... 3-8
3.4.1. Cleaning and Inspection ............................................................................................... 3-8
3.4.2. Recommended Cleaning Materials ............................................................................... 3-8
3.5. Contact Cleaning Procedure ..................................................................................................... 3-9
3.5.1. Contacts that are Severely Burned ............................................................................... 3-9
3.5.2. Contacts with Heavy Tarnish, Slightly Rough or Pitted Surface ................................... 3-9
3.5.3. Contacts with Surface Film or Oxidation (not Pitted) .................................................... 3-9
3.6. Check-Out Procedure (Performance Test) ............................................................................... 3-9
3.7. Repairs, Replacement and Adjustment of Relay Components................................................. 3-9
3.7.1. Recommended Tools and Test Equipment ................................................................ 3-10
3.7.2. Vane Removal ............................................................................................................ 3-10
3.7.3. Vane Installation.......................................................................................................... 3-11
3.7.4. Contact Block Replacement and Adjustment ............................................................. 3-13
3.7.5. Contact and Counterweight Adjustment Procedure .................................................... 3-14
Copyright 2019

Table of Contents

SM 4574F, Rev. 4, March 2019
PV-250 Track Relay
iii