Description
Low Voltage 4-20 mA Analog Output Relay model 489-P5-LO-A20-E can be used alongside a generator and is typically used to both manage and protect the generator. The associated phase current inputs associated with this model are five ampere CT secondaries.
489-P5-LO-A20-E Technical Specifications
| Communication Ports Parity | None, Odd, Even |
| Harsh Environment Coating | Not Available on this Model |
| High-Set Phase Overcurrent Elements | Trip |
| IRIG-B Amplitude Modulated | 2.5 to 6.0 Vpk-pk at 3:1 signal ratio |
| Low Forward Power Time Delay | 0.2 to 120.0 s in steps of 0.1 |
| Phase Overcurrent Voltage Restraint | Programmable Fixed Characteristic |
| Pollution Degree | II |
| Pulse Output Pulse Width | 200 to 1000 ms in steps of 1 |
| Tachometer Configurable | assignable to Digital Inputs 4 to 7 |
| Weight | Approximately 10 lbs. |
The 489-P5-LO-A20-E is a GE Multilin Relay from GE’s SR family of relays (in the same family as the GE Multilin 469 Motor Protection Relay and the GE Multilin 735 Feeder Protection Relay.) The 489-P5-LO-A20-E is designed for Generator Protection and can be used for induction or synchronous generators. The unit can be operated at 25, 50 or 60 Hz. The 489-P5-LO-A20-E is designed with a 40-character display that allows users to view value messages, diagnostics, and setpoints. The front panel includes a numeric keypad, status indicators, value up and down keys, an RS232 port interface, and control and programming keys including reset, enter, menu, menu up, and menu down keys. This allows control without connecting to an external computer. The back panel includes twelve RTD inputs, six output relays, two RS485 communications ports, and four VT inputs. The RTDs are field programmable. Communication ports can use ModbusRTU or DNP 3.0 protocol (or both) up to 19200 bps. The back panel of the 489-P5-LO-A20-E also includes four isolated 4-20 mA analog inputs and outputs along with seven assignable digital inputs. There are seven CT inputs for three-phase output/three-phase neutral and ground current sensing as well as a separate safety and filter ground. All inputs on the 489-P5-LO-A20-E meet SWC, C37.990 EMI, RFI interference immunity.
The communication module of the programmable controller is equivalent to the network interface in the local area network. The communication module data bus is connected to the PLC host, and the communication protocol is realized by hardware and software. The communication module of the programmable controller is generally provided with multiple interfaces, which can be selected through the selection switch on the communication module to realize the communication with other programmable controllers, intelligent control devices or computers. The input module is used to receive and collect input signals. There are two types of input signals: one is the switch input signal, which is provided by the button switch, the travel switch, the digital dip switch, the proximity switch, the photoelectric switch, the pressure relay, etc. The other is a continuously varying analog input signal sent by a potentiometer, thermoelectric meter, tonometer, motor, and various transmitters. The input module also needs to convert these different level signals into digital signals that the CPU can receive and process. The function of the output module is to receive the digital signal processed by the central processor and convert it into a signal that can be received by the field executive parts for controlling contactors, solenoid valves, regulating valves, speed regulating devices, etc. Another type of load control is the indicator light, digital display and alarm device.
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