HONEYWELL FTA-T-21 base module

The engines idle speed must be equal to or greater than the configured “Idle Speed” value to start the “Idle Time”. The EGCP-2 uses the magnetic pickup (MPU) signal to calculate the idle speed. If no MPU is connected, the idle speed is calculated from the Generators frequency. Remember, if the generator is NOT excited at idle speed and there is no MPU signal, the Idle/Rated switch will not energize. When a Loss of Mains (LOM) or an overloaded system condition exists, the idle/rated function is bypassed, and rated speed is selected during the start sequencing routine

Modbus® /ServLink Communications 

The laptop or desktop computer, which will be used with the EGCP-2 RS-422 port, will have a 9-pin serial port. This port is configured by the computer hardware to use a serial communications protocol called RS-232. The details of this protocol are not important to know for hardware connection to the EGCP-2 control(s), other than there is a need to convert the RS-232 protocol of the computer port to RS-422 protocol used by the EGCP-2 control network. This conversion is accomplished via an external conversion module, which takes the 9-pin RS-232 serial port input from the computer, and changes it to a RS-422 protocol for the EGCP-2. These converters can be found in most computer or electronics stores, and are called RS-232 to RS-422 Converters. Woodward offers a cable, 5417-551, which includes this converter. This cable is designed for point-to-point communications.

Hardware Connections 

Once the software is installed on the computer hard drive, the hardware connection between the computer and the EGCP-2 control must be made for correct communication between the two devices. This hardware connection is completed using a direct cable connection between the computer and the EGCP2 control(s) RS-422 network.

In a system with multiple (8 maximum) EGCP-2 controls, each control is interconnected to the others on the 422 network in a multi-drop fashion. The computer is linked to the network at any control as if it were the next control on the network, as shown below.