GE IS200EXAMG1B IS200EXAMG1BAA | Attenuation Module

Core Function and System Role

The GE IS200EXAMG1B attenuates high-voltage exciter signals for Mark VI systems. Specifically, this board scales down 125 Vdc inputs to 5 Vdc logic levels. Moreover, it provides electrical isolation between power and control circuits. The IS200EXAMG1BAA variant includes precision resistors for tighter attenuation accuracy.

Technical Specifications Overview

This attenuation module features six independent input channels. Each channel provides 10:1 voltage division for signal scaling. Furthermore, the board achieves 2500 Vrms isolation between input and output.

Parameter	Specification
Part Number	IS200EXAMG1B / IS200EXAMG1BAA
Type	Exciter Attenuation Module / Signal Conditioning
Input Channels	6 Channels
Input Voltage Range	0-125 Vdc
Attenuation Ratio	10:1 (125V to 12.5V)
Output Voltage	0-12.5 Vdc
Output Impedance	1 kΩ
Isolation Voltage	2500 Vrms
Accuracy	±0.5% (Standard), ±0.2% (BAA)
Bandwidth	DC to 1 kHz
Input Impedance	100 kΩ
Power Supply	24 Vdc ±15%
Connector Types	2 x 50-pin D-sub, 1 x Terminal Block
Dimensions (W x H x D)	185 x 110 x 28 mm
Weight	0.58 kg
Onboard Energy Storage	6 x 100 µF, 160V Capacitors

Connector Layout and Component Count

The board uses one terminal block for high-voltage input connections. For instance, terminals 1-6 accept 125 Vdc exciter signals. Meanwhile, two 50-pin D-sub connectors route attenuated outputs to the controller. The IS200EXAMG1BAA adds six precision resistor networks for improved accuracy.

Energy Storage and Signal Integrity

This attenuation module includes local capacitance for input filtering. Specifically, six 100 µF capacitors smooth incoming DC voltages. Therefore, the board provides clean scaled outputs for accurate monitoring. Additionally, onboard LED indicators show power and channel status. For example, a green LED confirms proper 24 Vdc supply. Yellow LEDs illuminate when any channel receives an input signal.

Diagnostic Features and Fault Detection

The board continuously checks each channel for overvoltage conditions. Consequently, it detects input voltages exceeding 150 Vdc within 1 millisecond. Moreover, the GE IS200EXAMG1B IS200EXAMG1BAA includes output clamping for overrange protection. This feature prevents damage to downstream analog inputs. An onboard status register reports all channel health to the main controller.

Maintenance and Hot Replacement

You can replace this attenuation module without powering down the exciter. Thus, mean time to repair remains under ten minutes. The board stores no calibration data locally. Therefore, you simply install the replacement and resume normal signal conditioning.

Industrial Applications

This exciter attenuation module works inside GE Mark VI excitation panels. For reliable GE signal scaling, the IS200EXAMG1B and IS200EXAMG1BAA deliver exceptional performance. They provide accurate voltage division for steam and gas turbine generator exciter feedback.