The Weller WES51 Electronic Soldering Station is a microprocessor-controlled device designed for industrial manufacturing, rework, and repair. It offers precise temperature control and a range of features for efficient soldering.

Function Description:

The WES51 Soldering Station provides a controlled heat source for soldering applications. It features a digital electronic control system that allows users to adjust the tip temperature and maintain it with high accuracy. The station is equipped with a grounded soldering iron tip, zero power switching, and an anti-static design, ensuring compliance with Weller's quality standards. A unique feature is its automatic sleep mode, which shuts off power to the tool and indicator LED after 99 minutes of inactivity, conserving energy and extending tool life. The station also includes an external tip temperature offset and a lockout feature, which allows users to set and lock the tip temperature using the supplied PW50 Probe.

Important Technical Specifications:

Stations:

Power Input: 120VAC ±10%, 60 Hz (or 230VAC ±10%, 50/60 Hz), 60 watts.
Power unit output voltage: Isolated 24VAC @ 2.1 amperes.
Size: 4.5" x 5.9" x 3.6".
Line Cord: 3-Wire, UL Recognized.
Tip temperature control range: 350°F to 850°F (177°C to 454°C).
Control setting resolution: 10°F (6°C).
Stability: ±10°F (±6°C) per MIL-STD-2000.
Absolute accuracy: Average tip temperature can be "Offset" to ±9°F (±5°C) at idle with no load.
Ambient temperature range: 60°F to 110°F (16°C to 44°C).

Pencils (PES51 Soldering Tool):

Wattage: 50 watts at 24 Vac.
Tip voltage: Less than 2 mv TRMS to line cord ground pin.
Tool weight: 2 ounces without cord.
Tool material: Static dissipative thermoplastic handle and stainless steel.
Heater type: Fiberglass and ceramic insulated heating element, reverse wound for low leakage and magnetic field cancellation.
Tip type: Weller® ET and SMT series tips, copper with heavy iron, nickel, and chromium plating for long life.
Sensor: Type "K" Thermocouple, fits deep inside tip for maximum response.
Handle design: Heat insulated with foam sleeve for low grip temperature and maximum comfort.
Tool cord: Silicone rubber, burn resistant.
Connector: Polarized, 6 pin locking.
Recovery time: Less than 10 seconds from 100°F drop with ETA tip at 700°F.

Standards Compliance:

Housing and tool handle made with Electrostatic Protective Materials as required in MIL-B-81705.
Housing passes Static Decay Test per Federal Test Method Std. No. 101, Method 4046.
Weller® ESD tools comply with DOD-HDBK-263.
WES51 & WESD51 units are U.L. Listed and meet MIL-STD-2000, MIL-S-45743, W-S-6536, W-S-570 & DOD-STD-1686.
WES51 units are UL/CUL listed and meet all applicable standards for CE mark.

Usage Features:

Temperature Adjustment: Tip temperature is adjustable from 350°F to 850°F (177°C to 454°C) using the front panel control knob.
LED Power Indicator: The LED indicates station status:
- "Green" for normal operation (unlocked mode).
- "Red" if the temperature is "Locked".
- Full "On" (Green or Red) indicates the station is ramping up to temperature.
- Full "Off" or flashing steadily (Green or Red) indicates the station has reached the "Set Point".
Lockout Feature: The temperature setting can be locked to prevent accidental changes. To activate, apply the Lockout Pencil to the ESD symbol until the LED blinks "Red" slowly (5 Hz), then remove the pencil within 2.5 seconds. The LED will turn "Red", and the control knob will have no effect. To reverse, repeat the process; the LED will turn "Green", and the knob will function normally.
Tip Temperature Offset: This feature allows users to fine-tune the tip temperature for specific applications. It involves monitoring the tip temperature with a K111 Type "K" Thermocoupled Tip temperature test kit, adjusting the set knob, and then applying the Lockout Pencil to the ESD symbol until the LED blinks "Red" then "Green" slowly.
Auto Off Feature: The station automatically shuts off power to the tool and LED after 99 minutes of inactivity.
Optimal Temperature Use: Users are advised to use the lowest temperature that can handle the soldering load. The electronic control provides maximum power even at lower temperatures, protecting sensitive components from heat damage.
Tool Stand: The unit includes a tool stand with a spring and funnel for convenient tool placement and tip cleaning.

Maintenance Features:

Troubleshooting Guide: The manual provides a comprehensive guide for troubleshooting common issues such as the tool not heating, tool overheating, and tip temperature testing errors.
Internal Access: Access to internal parts for service is gained by removing four rubber feet, four screws under the feet, and the top case.
Component Checks: The guide details checks for line cord continuity, power switch continuity, transformer primary and secondary voltages, wiring to the printed circuit board, and tool receptacle connections.
Tip Care:
- Keep the tip tinned and wipe only before using.
- Use rosin or activated rosin fluxes; avoid acid-type fluxes.
- Remove and clean the tip regularly with a suitable cleaner. If the tip does not remove easily, do not force it; try removing it while heated, or return the tool for service.
- Avoid cleaning the tip with abrasive materials or filing it, as this reduces tip life.
- If the tip becomes unwettable, clean it hot with a soft steel or brass brush using solder flux, or with a Weller® WPB1 polishing bar when cold, then immediately re-tin.
- Do not remove excess solder from the heated tip before storing to prevent oxidation.
- Avoid using compounds or anti-seize materials on Weller® tips or sensor probes, as this can cause wettability problems and seizing.
Replacement Parts: A list of replacement parts and accessories is provided, including power switches, circuit board assemblies, transformers, heating elements, and various soldering tips.

Available Models:

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 (available separately as a replacement).

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. Do not remove the ground prong from the line cord plug, as this may cause erratic tip temperature control.

ACTION ELECTRONICS WES51 - EXPLODED VIEWS; EXPLODED VIEW WES51; EXPLODED VIEW PES51