Hypertherm HT2000 Reference manual

THC Motherboard Relay
Replacement
Kit: 128404
Field Service Bulletin
IM-356
(P/N 803560)
Revision 0 April, 1999
Hypertherm, Inc.
Hanover, NH
http://www.hypertherm.com
email:[email protected]
© Copyright 1999 Hypertherm, Inc.
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THC Motherboard Up / Down DC Relay Replacement
Page 1
Field Service Bulletin 803560
WARNING
ELECTRIC SHOCK CAN KILL
MODIFICATION MUST BE PERFORMED ONLY BY HYPERTHERM TECHNICIANS,
DISTRIBUTORS OR QUALIFIED ELECTRONICS TECHNICIANS
HT2000, HT2000LHF, MAX200, HT4100: Push the OFF (0) button on the power
supply and turn the main disconnect switch OFF before removing the front panel of the
power supply.
HT4001: Position the ON/OFF circuit breaker on the rear of the power supply to the
OFF (O) position and turn the main disconnect switch OFF before removing the rear
panel of the power supply.
128404 Kit Contents
Part No. Description Qty
003111 Relay: .02-1A@10-200 VDC, Solid State 2
803560 FSB: THC Motherboard Up/Down DC Relay Replacement 1
INTRODUCTION
This field replacement kit is for customers that have an HT4001, HT4100, HT2000, HT2000LHF or MAX200
power supply with the on-board torch height (THC) control system, and who need to interface the THC torch
UP/DOWN motion signals with a DC torch-lifter motor.

THC Motherboard Up / Down DC Relay Replacement
Page 2
Field Service Bulletin 803560
Relay Replacement
The stock THC motherboard comes with AC relays for torch UP and DOWN control. These 2 relays, CR2 and
CR3 must be removed from the motherboard and replaced with the 003111 DC relays from this kit.
HT2000, HT2000LHF, MAX200, HT4100:
1. Remove the power supply front panel.
HT4001:
1. Remove the power supply rear panel.
All Systems:
2. Locate the THC motherboard.
3. Remove 4 screws that fasten the plastic THC cover to the THC pcb assemblies.
THC Motherboard
Remove screws

THC Motherboard Up / Down DC Relay Replacement
Page 3
Field Service Bulletin 803560
4. Locate CR2 and CR3 on the THC motherboard.
CR2
CR3
5. Remove the screws securing CR2 and CR3 to the motherboard.
6. Gently pull the CR2 and CR3 relays from their sockets.
7. Insert the 003111 relays into the motherboard sockets.
8. Reinstall the CR2 and CR3 screws to secure the 003111 relays to the motherboard.
9. Refasten the THC plastic cover to the THC motherboard.
10. Reinstall the power supply covers.
Installation is complete. Refer to your system instruction manual to connect the machine interface cable to the
torch lifter motor.