OWNER’S MANUAL
© 1996 MILLER Electric Mfg. Co.
February 1996 FORM: OM-823K
Effective With Serial No. KE581846
RHC-3, RHC-3GD25B, RHC-3GD34A, And
RHC-14 Remote Hand Controls
See welding power source Owner’s Manual for all relative safety information.
1. Specifications And Connections
ST-141 127-A
1 Twistlock Plug
2 5- Or 14-Pin Amphenol Plug
Units are equipped with a 20 ft
(6 m) cord. If a longer cord is
required, see Table 3-1.
A 7-1/2 in
(191 mm)
B 9-1/2 in
(241 mm)
C 8-3/4 in
(222 mm)
B
C
A
1
2
2. Selecting Interconnecting Cord
Conductor Size (*AWG)
Cord Length Amperage Or Voltage Control RHC-14
Up to 20 ft (6 m) No. 16
Up to 20 ft (6 m) (GD Models) No. 14
21 to 100 ft (6 to 30 m) (GD Models) No. 12 No. 18 For Any Length
21 to 50 ft (6 to 15 m) No. 14
51 to 100 ft (16 to 31 m) No. 12
101 to 200 ft (31 to 61 m) No. 10
*AWG − American Wire Gauge
OM-823 Page 2
3. Adjusting Amperage Or Voltage
. On some welding power
sources, the front panel output
control setting does not matter
and the Remote Hand Control
adjusts the full range of the
welding power source output.
Ref. ST-122 023-A / Ref. ST-141 127-A / ST-039 411-D / Ref. ST-159 059 / Ref. ST-130 214-A
Example Of Remote Amperage Control Without Output (Contactor) Control
Set Switch Set Control Adjust Remote Amperage
Example Of Remote Amperage Control With Output (Contactor) Control
Min
(40 A)
Max
(200 A)
In Example: Min = 40 A In Range B,
Output = 120 A (50% of 40 to 200)
Max = 200 A In Range B
Set Switches Set Control
Min
(5 A)
Max
(200 A)
Place switch in On position for open-circuit
voltage. When switch is in Off position no
output is present.
In Example: Min = 5 A
Output = 200 A (100% of 5 to 200)
Max = 200 A
OM-823 Page 3
4. Routine Maintenance
Y Turn Off all power before maintaining.
3 Months
Everyday
Replace
Cracked
Parts
Replace
Unreadable
Labels
Cord(s)
Move Control From
Min. To Max.
5. Troubleshooting
Trouble Remedy
No amperage or voltage control. Set switches and controls on welding power source or generator (see Section 3*).
Check weld output on welding power source or generator.
Secure cord connections or replace cords, if necessary.
No output (contactor) control. Remote Hand Control switch in wrong position or control not so equipped.
Check switch settings and weld output on welding power source or generator.
Secure cord connections or replace cords, if necessary.
*See welding power source or generator Owner’s Manual.
6. Circuit Diagrams
SA-150 670-A
RHC-3
SA-094 231-B
RHC-3-GD34A
SA-094 232-A
RHC-3-GD25B
SA-053 656-A
RHC-14
OM-823 Page 4
7. Parts List
3
Description
Part
No.
Dia.
Mkgs.
Item
No.
Figure 6-1. Complete Assembly
Model
RHC-
14
RHC-
Quantity
RHC-3-GD
25B 34A
1 R1 030 653 RHEOSTAT, WW 150W 15 ohm 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1 R1 035 897 POTENTIOMETER, C sltd sft 1/T 2W 1K ohm 1. . . . . . . . . . . . . . . . . . . . . . . .
1 R1 605 049 RHEOSTAT, WW 300W 25 ohm 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1 R1 605 960 RHEOSTAT, WW 300W 34 ohm 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 085 220 LABEL, caution electric circuit 1 1 1 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3 +021 475 WRAPPER 1 1 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3 +014 417 WRAPPER 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4 106 952 CASE SECTION, base/front/rear 1 1 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4 109 974 CASE SECTION, base/front/rear 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5 PLG1 605 797 PLUG, twlk 3P3W 20A 125V 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5 PLG1 144 310 HOUSING PLUG & PINS, (consisting of) 1. . . . . . . . . . . . . . . . . . . . . . . . . .
134 732 TERMINAL, male 1 pin 24-20 wire 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
143 922 CLAMP, cable strain relief sz 17 & 20 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5 PLG1 039 621 PLUG, twlk armd 4P4W 20A 250V 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5 PLG1 032 898 PLUG, twlk grd 2P3W 15A 125V 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6 106 945 CABLE, pwr 20ft 16ga 3/c 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6 175 284 CABLE, pwr 20ga 5/c (order by ft) 20ft. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6 604 834 CABLE, port No.14 4/c (order by ft) 20ft. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6 600 349 CABLE, port No.14 3/c (order by ft) 20ft. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7 010 659 CONNECTOR, clamp cable .375 90deg 1 1 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8 097 926 KNOB, pointer 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8 097 922 KNOB, pointer 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8 148 723 KNOB, pointer 1 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9 039 411 NAMEPLATE 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9 130 214 NAMEPLATE 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9 013 615 PLATE, ind amperage 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9 148 717 NAMEPLATE, RHC-3GD 34A 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
S1 011 609 SWITCH, tgl SPDT 15A 125VAC 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12
4
567
8
9
ST-141 128
3
Figure 6-1. Complete Assembly (RHC-3 Illustrated)
+When ordering a component originally displaying a precautionary label, the label should also be ordered.
BE SURE TO PROVIDE MODEL AND SERIAL NUMBER WHEN ORDERING REPLACEMENT PARTS.
/