Usage:
FIGURE 2A
FIG 2A shows the details of the input/output connections to this plate assembly.
2.1 Power Connections
2.2 Digital Input Connections
These digital inputs are designed to be connected to a set of dry contacts to Battery Plus; ie, they are connected to an open circuit (O.C.) or to battery positive.
The notch code inputs can be connected directly to the original governor "A, B, C, and D" inputs. The generator unload input can be connected directly to the original governor "E" input. In each case the polarity should be correct.
The details of the dynamic brake wiring need to be worked out for each specific locomotive since it will depend on the type of equipment fitted; eg. standard or extended range. The polarity of the dynamic brake digital input needs to be specified by the locomotive operator.
The CATERPILLAR LOCOMOTIVE GOVERNOR system includes closed loop generator output current regulation, normally this would be set to the maximum continuous rating of the generator (4200 Amps for the AR10 generator). This limit can be set to any level desired by the locomotive operator. The transition input allows the locomotive operator the option of specifying a higher intermittent rating belw transition to increase the tractive effort available at zero ground speed (see TABLE 1). If this option is specified, the polarity of the transition digital input needs to be specified by the locomotive operator.
Some locomotives are equipped with a motor cutout feature, see section 4.4 for details. If this option is fitted, the polarity of the motor cutout digital input needs to be specified by the locomotive operator.
2.3 Digital Output
This output is a low voltage, low current drive (14 volts, 100 milliamps) intended to drive a cab mounted warning lamp. It is buffered by a relay in the CATERPILLAR emergency shutdown and alarm circuit junction box so that a normal 65 volt lamp can be used in the cab. It is recommended that the cab warning lamp labelled "governor shutdown" be relabeled "governor warning" and the buffer relay be wired to it.
2.4 Excitation Interface Connections
The CATERPILLAR LOCOMOTIVE GOVERNOR system provides the interconnection between the PF and SE module normally provided by the SB module.
Care should be exercised in the choice of a suitable PF module to fully exploit the increased output power of the CATERPILLAR 3612 engine. If higher rating traction motors are fitted, this will also affect the choice of PF module.
It is recommended that a SE 10 module be used. The standard tuning constants in the load control loop function satisfactorily with this module. If another type of SE module is used, the CATERPILLAR LOCOMOTIVE GOVERNOR may require non standard tuning constants for the load control loop.
2.5 Analog Input Connections
0 - 50 VOLTS REF TO TB 391 L9
The current sense signal is obtained from PF-19 connection, the scaling is correct for most types of PF modules.
See section 3.3 for the source of the voltage sense signal.
2.5.1 Derate Channels
0 - 50 VOLTS REF. TO TB 391 R3
2.5.2. Standard Engine Mounted Sensors
These are electrically isolated from the locomotive's electrical system.
2.6 Analog Output Connections
