Lincoln Electric SVM187-A Automatic Engine Idle System, Figure E.2 Engine Starting and Protection

Models: SVM187-A

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E-3

THEORY OF OPERATION

E-3

 

FIGURE E.2 - ENGINE STARTING AND PROTECTION

 

---

 

 

ELECTRODE

 

 

TERMINAL

 

 

OUTPUT

 

 

 

CONTROL

 

 

MIN

MAX

 

 

(OFF)

 

 

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THERMOSTART

BUTTON

TO IDLE / ENGINE

PROTECTION BOARD

TO IDLE/ENGINE

PROT. BOARD

S

T

A

R

STARTER T

SOLENOID E

R

RUN/STOP

IDLE SWITCH

SWITCH

 

THERMOSTAT

INJECTION

PUMP

SOLENOID

SYSTEM

DIESEL

ENGINE

OIL

PRESSURE TEMP

SWITCH SWITCH

IDLE

SOLENOID

AC

 

 

 

 

 

(-)

(+)

 

 

 

 

AC

 

 

 

 

 

 

REMOTE

 

 

 

 

 

RHEOSTAT

LOCAL

 

 

 

 

 

 

 

 

 

POLARITY

RHEOSTAT

 

 

 

 

(JOB SELECTOR)

 

 

 

 

SWITCH

 

 

 

 

RESISTOR

 

 

 

FLASHING

TO HOUR METER

 

(+)

 

RESISTOR AND

 

 

 

 

 

SHUNT COILS

 

 

 

DIODE

 

 

(-)

 

 

 

 

 

 

 

 

SERIES COILS

 

EXCITER

 

 

 

 

 

 

 

 

 

 

WINDING

(-)

(+)

 

GENERATOR

 

 

 

 

EXCITER

 

 

 

ARMATURE

 

ROTOR

 

 

 

AUXILIARY

POWER

WINDINGS

INTERPOLE COILS

115 VAC

230 VAC

to

to

 

HOUR

IDLE / ENGINE

AMMETER

METER

PROTECTION BOARD

RECEPTACLES

RECEPTACLES

 

 

 

 

 

TO

 

WORK

 

 

TERMINAL

 

FLASHING

ENGINE

TO ALTERNATOR

START

RESISTOR

AND

FAULT

 

BUTTON

FLASH/SENSE

DIODE

LIGHT

TO INJECTION

PUMP SOLENOID

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AUTOMATIC ENGINE IDLE SYSTEM

The automatic idle system reduces the engine RPM when there is no electrical demand on the machine. When an arc is struck, or a load of 100 Watts or greater is applied to the auxiliary output, the engine speed will immediately increase to high RPM. When the load is released, the engine continues to run at high RPM for about 12 seconds. If a load is re-applied during this time, the machine will continue to operate at high RPM. If no load is applied, the engine RPM is reduced to idle speed.

The automatic idle system functions by energizing a solenoid, which pulls the engine speed control to a pre- set low idle RPM position. When this solenoid is de- energized, the engine speed is controlled by the gov- ernor which maintains the engine RPM at the specified high RPM setting. The solenoid is supplied with +12VDC power whenever the idle switch is in the auto position. It is activated when circuitry on the Idler/engine shutdown PC board completes the sole- noid’s path to chassis ground.

The automatic idle circuitry on the PC board uses a magnetic reed switch to sense weld current and a toroidal current transformer to sense auxiliary current. When weld current flows the reed switch closes, con- necting the sense lead to chassis ground. When suffi- cient AC current flows, the toroidal current transformer sends a signal to the PC board.

When the idle switch is in the “high” position, power to the solenoid is shut off deactivating it and causing the engine to operate at high rpm. The idle circuitry on the PC board continues to sense if there is a load on any of the outputs, and continues to open and close the solenoid’s ground path.

If the machine had been operating at low idle and the idle switch is moved from auto to high, the engine RPM will increase immediately. If the switch is moved from high to auto, the engine RPM may be reduced imme- diately or it could take up to 12 seconds for the idle cir- cuitry on the PC board to activate and engage the sole- noid.

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NOTE: Unshaded areas of Block Logic Diagram are the subject of discussion

SAE-400 SEVERE DUTY

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Lincoln Electric SVM187-A service manual Automatic Engine Idle System, Figure E.2 Engine Starting and Protection

SVM187-A specifications

The Lincoln Electric SVM187-A is a cutting-edge welding machine designed for professional welders and industrial applications. Known for its reliability and performance, it stands out in the competitive welding equipment market. This versatile machine is structured to handle various welding processes, making it a popular choice among users.

One of the primary features of the SVM187-A is its multifunctional capabilities. It supports MIG, TIG, and Stick welding, allowing users to switch between different welding techniques seamlessly. This flexibility makes it suitable for diverse applications, whether working on automotive repairs, metal fabrication, or construction projects. Additionally, the machine is equipped with a robust power output, ranging from low to high amperage settings, enabling users to tackle a wide array of materials, including mild steel, stainless steel, and aluminum.

The SVM187-A incorporates advanced inverter technology, which ensures increased efficiency and reduced energy consumption. This technology leads to a more compact design, making the unit portable and easy to transport. The lightweight construction of the machine does not compromise its durability; it is built with high-quality materials to withstand the rigors of a professional workshop.

Another notable characteristic of the SVM187-A is its user-friendly interface. The intuitive control panel includes digital displays for precise settings adjustments, ensuring accuracy during operation. Beginners and seasoned welders alike can benefit from the clear and straightforward design, reducing training time and enhancing productivity.

Safety features are paramount in the SVM187-A's design. The machine is equipped with thermal overload protection, ensuring that it operates within a safe temperature range to prevent damage and promote longevity. Additionally, it features automatic voltage regulation, which maintains a stable arc even under varying input voltage conditions.

In summary, the Lincoln Electric SVM187-A is a versatile, efficient, and user-friendly welding machine suited for both professional and industrial applications. Its multifunctionality, inverter technology, and robust safety features set it apart from competitors, making it a reliable choice for welders seeking to elevate their craftsmanship while ensuring safety and efficiency. This machine represents the innovation and quality that Lincoln Electric is renowned for in the welding industry.