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Sepac - Model RAV 100 – RAV 1111 -Static Digital Excitation System
Microprocessed Unit (Programmable Logic Controller) DRIVE MASTER PLUS constitutes a digital control system that allows for voltage regulation at the synchronous generator`s terminals keeping in within its normal operation parameters in a safe way using the compensators and limiters included in the automatic channel.
The Programmable Logic Controller (DRIVE MASTER PLUS) has a microprocessor that executes functions through the PLC`s I/O. Standard configuration is: 64K memory, 1024 registers, Ladder Logic programming language, Instruction list and SFC, 0.15ms/k speed, 2 configurable serial RS232 or RS485 c ports, floating point math, RAM and clock back-up battery communication through serial ports or through LAN Ethernet (TCP/IP).
MANUAL CHANNEL
Similar to the automatic channel, the manual channel has its own PLC. The only difference is that the manual channel controls the excitation current as opposed to the auto channel which controls the voltage on the generator`s terminals. For model RAV 1111, the two channels are independent.
BACK-UP CHANNEL
An additional channel is allocated in case both auto and manual channels should fail. This back-up channel actually acts on the manual channel`s pulse generator.
POWER STACK
The Power Stack and associated logic are governed by the automatic channel, the manual channel and the back-up channel. Each channel is independent and linked through a balancing circuit that allows to position the demand angle of each channel and does not allow any voltage variation on the generator`s terminals when transfers are requested.
