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Hypertherm HT2000-200 Volt User Manual

Page 158

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MAINTENANCE

HySpeed HT2000

Instruction Manual

8-13

19

Problem

Possible Causes

/ Solutions

If there is no 120VAC, check pins, connectors and

associated wiring from CON1 to PCB4.

• If wiring is OK, PCB4 or PCB2 may be defective.

See

Section 10

for location of the relay that controls main

contactor CON1.

• If CON1 is getting 120VAC from the relay board as

described above, measure the voltage between

secondary terminals of main transformer T2 after the

START command is given. See Figure 9-3 for location of

T2. The voltage between any two of the three points

connected to each chopper should be equal to 200VAC.

If there is no voltage at any of the above points, replace

CON1.

If there is voltage at some but not all of the above points,

check wiring and connections to and from T2. If wiring

checks out OK, return to

Initial Checks

section and repeat

steps 1-5.

5.4. Choppers are defective or not functioning.

See

Chopper Module Test Procedure

later in this section.

6. The unit stops cutting during cut, or

cuts poorly.

6.1. The work cable is not connected or it is broken.

Connect or repair the work cable.

6.2. Arc not transferring to workpiece.

Check work cable connection to workpiece. Good contact

must be made in order for the arc to transfer.

6.3. There is insufficient air or gas pressure.

Check gas inlet pressure and the plasma and shield gas

pressures in TEST and RUN modes as specified in the

Cut

Charts.

6.4. Torch is getting insufficient current.

Check the arc current setting in the

Cut Charts

for the type

and thickness of metal you are cutting.

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