Weller WES51 User Manual
MODEL WES51 ELECTRONIC SOLDERING STATION
DESCRIPTION
The WES51 Soldering Station is one in a series of products, which have been developed for industrial manufacturing as
well as for the rework and repair sector. The microprocessor control allows for simple and easy operation. The digital
electronic control system offers excellent control performance for various soldering jobs.
A grounded soldering iron tip, zero power switching and anti-static design of the station and tool allows the WES51
Soldering System to meet the high quality standards established by Weller®. The station features external tip temperature
offset and the ability to lock the tip temperature setting using the PW50 Probe supplied. The station will automatically
enter a sleep mode and shut off power to the tool and indicator LED after 99 minutes of inactivity.
Tip temperature is adjustable in the range of 350°F to 850°F (177°C to 454°C), with the front panel temperature control
knob. The LED power indicator will be Green for normal operation or Red, if the temperature is Locked. The LED for
the WES51 will also indicate the operation of the station by the following sequence: Indicator LED full On, indicates that
the station is ramping up to temperature (this can be indicated in either the Green Unlocked mode or the Red
Locked mode). Indicator LED full Off or flashing steadily, indicates that the station has reached the Set Point (this also
can be indicated in either the Green Unlocked mode or the Red Locked mode). This soldering station is UL/CUL
listed and meets all applicable standards for the CE mark.
OPERATING INSTRUCTIONS
Unpack unit carefully. Place spring and funnel in slot in top of tool stand. Dampen the sponge, distilled or de-ionized water
is preferred. Insert tool in holder and connect tool plug to receptacle on power unit; rotate plug housing Clockwise (CW) to
lock plug into receptacle. Insert line cord plug into properly grounded AC receptacle and turn station On. Set
temperature control knob to desired tip temperature. Wait 30 seconds. Remove tool from holder and tin tip with solder. Unit
is ready for use once the LED begins to flash, indicating that it has reached the operating temperature (indicated in either
the Green or Red mode).
Always use the lowest temperature that will handle the load that you are soldering. The Weller® electronic control provides
maximum power to the heated load even when set to the lowest temperature; therefore, there is no need to use high
temperatures to handle heavy soldering loads. By using lower temperatures and properly selecting tip styles, sensitive
components will be protected from heat damage.
WARNING: Do not remove ground prong from line cord plug. Removal may cause tip temperature control to be erratic.
AVAILABLE MODELS AND HAND PIECES
PRODUCT DESCRIPTION
WES51 Power unit, 120V 60Hz, °F dial markings, PES51 tool and tool stand
WES51DUK Power unit, 230V 50/60 Hz, °C dial markings, PES51 tool and tool stand
PES51 50 watt Soldering Tool w/ETA Tip
WARNING: This product, when used for soldering and similar applications, produces chemicals known to the State of
California to cause cancer and birth defects or other reproductive harm.
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SPECIFICATIONS
STATIONS
1. Power Input: 120VAC ±10 %, 60 Hz, (230VAC ±10%, 50/60 Hz), 60 watts.
2. Power unit output voltage: Isolated 24VAC @ 2.1 amperes.
3. Size: 4.5" x 5.9" x 3.6".
4. Line Cord: 3-Wire, UL Recognized.
5. Tip temperature control range: 350°F to 850°F (177°C to 454°C).
6. Control setting resolution: 10°F (6°C).
7. Stability: ±10°F (±6°C) per MIL-STD-2000.
8. Absolute accuracy: Average tip temperature can be Offset to ±9°F (±5°C) at idle with no load.
9. Ambient temperature range: 60°F to 110°F (16°C to 44°C).
PENCILS
1. Wattage: 50 watts at 24 Vac.
2. Tip voltage: Less than 2 mv TRMS to line cord ground pin.
3. Tool weight: 2 ounces without cord.
4. Tool material: Static dissipative thermoplastic handle and stainless steel.
5. Heater type: Fiberglass and ceramic insulated heating element. Reverse wound for low
leakage and magnetic field cancellation.
6. Tip type: Weller® ET and SMT series tips. Copper with heavy Iron, Nickel and Chromium
plating for long life.
7. Sensor: Type K Thermocouple. Fits deep inside tip for maximum response.
8. Handle design: Heat insulated with foam sleeve for low grip temperature and maximum comfort.
9. Tool cord: Silicone rubber, burn resistant.
10. Connector: Polarized, 6 pin locking.
11. Recovery time: Less than 10 seconds from 100°F drop with ETA tip at 700°F.
STANDARDS
1. Housing and tool handle made with Electrostatic Protective Materials as required in MIL-B-81705.
2. Housing passes Static Decay Test per Federal Test Method Std. No. 101, Method 4046.
3. Weller® ESD tools comply with DOD-HDBK-263.
4. WES51 & WESD51 units are U.L. Listed and meet MIL-STD-2000, MIL-S-45743, W-S-6536, W-S-570 & DOD-
STD-1686.
5. WES51 units are UL/CUL listed and meet all applicable standards for CE mark.
ACTIVATION OF LOCKOUT FEATURE
1. Adjust the temperature set knob to the desired tip temperature.
2. Apply the Lockout Pencil to the ESD symbol on the front panel until the LED starts slowly (5 Hz) blinking Red.
Remove the Lockout Pencil within 2.5 seconds and the temperature setting will be Locked in. The indicator LED
will be Red and turning the temperature set knob will have no effect on the tip temperature.
3. Reverse the lockout by applying the Lockout Pencil to the ESD symbol until the LED is slowly blinking Red.
Remove the Lockout Pencil within 2.5 seconds and the temperature set knob will function normally and the
indicator LED will be Green.
Note: If the Temperature Set Knob has been adjusted during the Locked Mode, the station will control to the new
set point, once the Lockout feature has been disabled.
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TIP TEMPERATURE OFFSET PROCEDURE
1. Monitor the tip temperature using the K111, Type K Thermocoupled Tip temperature test kits. (see Replacement
Parts and Accessories Section)
2. Adjust the temperature set knob to the desired tip temperature and allow the tip temperature to stabilize.
3. Apply the Lockout Pencil to the ESD symbol on the front panel. The LED should slowly blink Red for 2.5
seconds and then slowly blink Green. Adjust the temperature set knob to the measured tip temperature, remove
the Lockout Pencil, and the Offset procedure is complete.
RESET STATION TO FACTORY DEFAULT SETTINGS
With station turned Off, adjust temperature set knob to 600°F (315°C). Apply the Lockout Pencil to the ESD symbol on
front panel and turn station On. Remove the Lockout Pencil and the procedure is complete. Any tip temperature offset
programmed above will be reset to nominal factory settings.
AUTO OFF FEATURE
The Weller® Model WES51 Station will automatically shut off power to the tool and the power indicator LED after 99 minutes of inactivity of the iron. Certain applications may not be recognized by the Loading Effect on the tool and may require
more frequent wiping of the tip on the damp sponge to recognize use.
TROUBLESHOOTING GUIDE
WARNING: AC line voltage is present inside power unit even when power switch is off. Refer service to qualified
personnel.
NOTE: Access to internal parts may be gained by removing four rubber feet, four screws under feet and top case.
TOOL DOES NOT HEAT
With line cord unplugged and power switch on, check for approximately 21 ohms at line cord blades (55 ohms for 230V
unit).
· Check power switch for continuity in the On position - replace if defective.
· Check line cord for continuity - repair or replace if defective.
· Check transformer primary - replace transformer if defective.
With line cord plugged in and power switch on, check for 24VAC ±10% between pins #2 and #6 of tool receptacle.
· Check transformer secondary for 24VAC ±10% - replace transformer if defective.
· Check wiring to printed circuit board assembly - repair or replace if defective.
· Replace printed circuit board assembly.
Check wiring from tool receptacle to printed circuit board.
· Repair or replace if defective.
Replace soldering tool with known good tool and recheck.
· Refer to Tool Troubleshooting Guide
· Replace printed circuit board assembly.
TOOL OVERHEATING
Replace soldering tool with known good tool and recheck.
· Refer to Tool Troubleshooting Guide
Replace printed circuit board assembly in station.
TIP TEMPERATURE TESTING ERRORS
NOTE: Tip temperature testing must be done using the K111, Type K Thermocoupled Tip temperature test kits. (see
Replacement Parts and Accessories Section). Other methods (Contact Pyrometers or Large Loading Devices),
or heavier thermocouple wire, will cause errors. Replace soldering tool with known good tool and recheck tip
temperature.
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