HD3070 with Automatic Gas Console Instruction Manual 5-71
16
MAINTENANCE
CH130 Chopper Module Test Procedure
Use the following procedure as an aid in troubleshooting the chopper module. Refer to the power unit wiring
diagram at rear of this manual.
1. Turn all power to the HD3070 OFF.
Disconnect mating receptacles in the RHF console to disable the high frequency transformer T1. See Figure
6-11 for location of T1.
Note: RHF console door must be re-shut before attempting to start system.
2. Remove large fuse F4 and check for open. See Figure 6-6 for location of fuse.
3. Place the positive lead to the + side of the bridge and the negative lead to the – side of the bridge. See Figure
5-9. Note that actual connection points are hidden by the cap support bracket in Figure 5-9.
4. Turn power to the HD3070 ON, and start system up. After the START command has been given, check voltage.
The input to the chopper at these points should be about +280 VDC.
If the input is OK and fuse F4 was blown, replace the chopper module.
If there is no
+280 VDC input, check input to bridge for shorts. Also, check contactor (CON1), connections and
associated wiring to the contactor. Repair and/or replace defective component(s) if necessary.
WARNING
SHOCK HAZARD: Use extreme care when working near the chopper modules. The large electrolytic
capacitors (blue-cased cylinders) store large amounts of energy in the form of electric voltage. Even if the
power is off, dangerous voltages exist at the capacitor terminals, on the chopper, and the diode heatsinks.
Never discharge the capacitor(s) with a screwdriver or other implement…explosion, property damage and/or
personal injury will result.
Flowrates (%)
Shield Plasma
O
2
&N
2
H35 N
2
(3) (4) (5) (6)
Pressures
Preflow
(psi/bar)
Flowrates
(%)
N
2
&N
2
(1) (2)
22/1.5 45 45 78/5.3 49/3.4 60 60 30 30
24/1.7 95/5.5 50/3.4
Pressures
Plasma Shield
(psi/bar)
PAC 186 Torch
Stainless Steel – H35 & N
2
Plasma – 100 Amp Consumables
Test Preflow Test Cut
Test
Run
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