Hypertherm PAC500 Flow Switch Upgrade - Manual (Page 3)

Page 1 UPGRADE INSTRUCTIONS
PAC-500 FLOW SWITCHES
Purpose
The PAC-500 flow switch upgrade instructions provide the necessary information to allow the
removal of the existing two flow switches and replacing them with the Kobold flow switch subas-
sembly.
Customer Supplied Tools
Straight blade screwdriver
7/16" (11.11 mm) open-end wrench
9/16" (14.29 mm) open-end wrench
11/16" (17.46 mm) open-end wrench
1/4" (6.35 mm) hex wrench
Flow Switch Assembly Upgrade Kit (# 028485)
Kobold flow switch SA, PAC-500, # 029545
Flow switch, 0.25 GPM 1/4 NPT SPST, # 005139
Flow switch, 1.20 GPM 1/4 NPT SPST, # 005140
Flow switch manifold, # 004457
Plug 1/4, # 015561
Tyrap (5), # 074005
Procedure
Remove Existing Flow Switches
To remove the existing flow switches from the PAC-500 Console, refer to the following procedure
and the figures called out in the PAC-500 Water-Injection Plasma Arc Cutting System Instruction
Manual IM-37 (P/N 800370).
1. Prior to proceeding with the upgrade installation, shut the power supply down at the front
panel and turn off power at the disconnect box. Disconnect the gas supply to the power
supply. Disconnect the water supply to the power supply.
2. Open the cover to access the plumbing compartment. Locate flow switches 1FLS and 2FLS
Refer to Figure 8.
3. Remove the tyraps from around the flow switch leads which are connected to terminal strip
3TB.
4. Disconnect the four (4) flow switch leads from 3TB. These leads are marked 9, 15 (two
leads), and 25.
5. Disconnect and discard hose assembly (024057) between flow switch 1FLS (005054) and the
cathode block.
6. Disconnect hose assembly (024040) only at flow switch 2FLS (005053).
7. Remove the two (2) screws, washers, and nuts to remove the flow switch SA.