Hitachi PV-250 Installation Operation & Maintenance page 6

3.7.6. Test for Balanced Magnetic Circuit ............................................................................. 3-18
4. PARTS LIST ...................................................................................................................................... 4-1
4.1. PV-250 Track Relay (N342555-809 and N342555-909) ........................................................... 4-1
4.2. Contact Block Assemblies (N433482) ...................................................................................... 4-4
4.3. Relay Mounting Base Assembly (N438689-003 and N434647) ............................................... 4-5
4.3.1. New Style Mounting Base (N438689-003) .................................................................... 4-5
4.3.2. Old Style Mounting Base (N434647) ............................................................................. 4-7
5. RAIL TEAM AND TECHNICAL SUPPORT ....................................................................................... 5-1
Figure 2-1. Typical Plug-In Relay and Mounting Base .............................................................................. 2-2
Figure 2-2 - Receptacle Contact Springs Installed ................................................................................... 2-4
Figure 3-1. AC Vane Relay Test Circuit .................................................................................................... 3-4
Figure 3-2. Adjustment of Heel Spring Clips ........................................................................................... 3-12
Figure 3-3. Method of Closing in of Lower Heel ...................................................................................... 3-13
Figure 3-4. Application of Bending Tools ................................................................................................ 3-13
Figure 3-5. Table Torque Arm ................................................................................................................. 3-16
Figure 3-6. Inspecting Loose Counterweights and Loose Trunnion Screw Locknuts ............................. 3-18
Figure 4-1. PV-250 Relay Typical Top Assembly (N342555-809) ............................................................ 4-3
(For specific contact block arrangement, please refer to Table 4-2, Table 4-3, and Figure 4-2.) .............. 4-3
Figure 4-2. Contact Block Assemblies ...................................................................................................... 4-4
Figure 4-3. New Style Mounting Base Assembly (N438689-003) ............................................................. 4-6
Figure 4-4. Old Style Mounting Base Assembly (N434647) ...................................................................... 4-8
Copyright 2019
List of Figures
SM 4574F, Rev. 4, March 2019
PV-250 Track Relay
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