20531962 Volvo.Penta Nut

To prevent damage to a control system that uses an alternator or battery-charging device, make sure the charging device is turned off before disconnecting the battery from the system.
Electronic controls contain static-sensitive parts. Observe the following precautions to prevent damage to these parts. * Discharge body static before handling the control (with power to the control turned off, contact a grounded surface and maintain contact while handling the control).* Avoid all plastic, vinyl, and styrofoam (except antistatic versions) around printed circuit boards.* Do not touch the components or conductors on a printed circuit board with your hands or with conductive devices.
Introduction
This manual describes the Woodward 701 Digital Speed Control, models 9905-211, 9905-212, 9905-213, 9905-214, 9905-215, 9905-216, and 9905-457.Application
The 701 Digital Speed Control controls the speed of reciprocating engines in mechanical drive or generator set service. The control includes an input for a 4 to 20 mA remote speed reference setting, an internal speed reference for local control of speed, and an auxiliary voltage input for load sensor connection in load sharing applications.The 701 control system includes:* a 701 Digital Speed Control;* an external power source;* a speed-sensing device;* a proportional actuator to position the fuel rack;* a terminal for adjusting control parameters;* an optional load sensing device.The 701 control (Figure 1-1) consists of a single printed circuit board in a sheet-metal chassis. Connections are via two terminal strips and a 9-pin subminiature D connector.Control Options
The 701 control provides the following power supply input voltages, with 8 watts as the nominal power consumption at rated voltage:* 18-40 Vdc (24 or 32 Vdc nominal);* 88-132 Vac 45-65 Hz (120 Vac nominal);* 90-150 Vdc (125 Vdc nominal).Discrete input voltages provide on/off command signals to the electronic control, such as Raise Speed, Lower Speed, etc. Each discrete input requires 10 milliamps at its nominal voltage rating:* 24 Vdc where 24 volts is used for switching logic;* internal auxiliary voltage provided on the control for use on high voltage versions of the 701 control in systems where 24 Vdc switching logic voltage is unavailable (dry contact switches or relays must be used).Other available options are:* proximity switch input for speed signal frequencies below 100 Hz;* tandem actuator outputs;* speed filter;* six-breakpoint torque limiter.These models of the 701 Digital Speed Control are available with the following option combinations. The part number is stamped on the identification tag on the front of the control. The magnetic pickup versions are limited to operating speeds providing 60 Hz magnetic pickup frequency minimum.701 Digital Speed Control Accessories
Set Point Programmer (Figure 1-2), part number 8280-107, is used for adjusting the 701 control. It plugs into the serial port of the control.Generator Load Sensor, for load sharing or droop-parallel generator applications.SPM-A Synchronizer, for synchronizing the generator phase to that of the power bus. The synchronizer generates a close generator breaker signal to parallel the generator with the power bus.Power Output Sensor, for load sharing or droop operation in mechanical load applications.Real Power Sensor, for load sharing or droop-parallel generator applications.
Figure 1-1. 701 Digital Speed Control
Figure 1-2. Set Point Programmer
Figure 1-3a. Plant Wiring Diagram (low voltage power supply)
Figure 1-3b. Plant Wiring Diagram (high voltage power supply)
Figure 1-4a. Block Diagram (standard models)
Figure 1-4b. Block Diagram (9905-457)