A6060 Circuit Board, Introduction | Generac Power Systems 941-2

Section 3.6

SPEED CONTROL SYSTEM

GENERAL

The AC generator's output voltage is controlled by a "computerized" speed control system. This system changes engine speed in response to changes in the AC output voltage at varying engine loads. The speed control system consists of (a) the A6060 circuit board and (b) a stepper motor.

A6060 CIRCUIT BOARD

This circuit board utilizes a closed-loop, proportional- derivative controller circuit which regulates the gener- ator's RMS voltage by changing engine speed. The system attempts to maintain an output voltage of about 115 volts at the lowest rpm and 120 volts up to the maximum rpm.

The A6060 circuit board controls a stepper motor by calculating the number of steps the motor needs to take and then supplying the necessary signals to the motor to take those steps.

STEPPER MOTOR PROBLEMS

INTRODUCTION:

Some stepper motor problems that might occur include the following:

•Throttle linkage or carburetor throttle shaft sticking, or linkage disconnected.

•Stepper motor failed or seized.

•Electrical connections to stepper motor broken or disconnected.

•Electrical leads to stepper motor are connected wrong.

THROTTLE LINKAGE:

Check throttle linkage and carburetor throttle shaft for binding, disconnected linkage. This type of problem will usually result in the carburetor throttle lever not moving. If the throttle lever does not move, the throttle may be stuck at a permanently open throttle or a per- manently closed throttle as follows:

1.If the throttle is open, engine will start but will accelerate quick- ly and uncontrollably. It will shut down when speed exceeds about 4200 rpm.

2.If the throttle is closed, engine will not accelerate under load.

STEPPER MOTOR FAILED OR SEIZED:

The engine will start but stepper motor will not turn. If an open throttle condition exists, either of the follow- ing might occur:

1.Engine may accelerate and shut down at 4200 rpm.

2.Engine may shut down after 15 seconds due to an overvoltage condition.

If throttle is closed, engine will be unable to acceler- ate under load and AC output will be low.

A failed stepper motor may also turn erratically. If this is the case, engine speed and AC output voltage will be erratic under constant load.

Figure 1. Speed Control System

Page 3.6-1

941-2, 940-2 specifications

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Generac Power Systems 941-2, 940-2 A6060 Circuit Board, Stepper Motor Problems, Introduction

Models: 941-2 940-2