GE IS200EGDMH1A Exciter Ground Detector Module

GE IS200EGDMH1A Exciter Ground Detector Module

Part Number IS200EGDMH1A Manufacturer General Electric Country of Manufacture As Per GE Manufacturing Policy Series EX 2100e Function Module Availability In StockIS200EGDMH1A is an Exciter Ground Detector Module manufactured and designed by General Electric as part of the EX2100 Series used in Excitation Control Systems. It mounts in the Exciter Power Backplane rack as a double slot, double height (6U) form factor board (EPBP). The field ground detector measures the resistance in the field between any point in the field circuit of the generator and the ground, whether it is on the ac or dc side. 

A redundant system will have three EGDMs, but a simplex system will have one. In order to communicate with the EGDM(s), EXAM, the attenuator module, measures the voltage across the ground sensing resistor. The High Voltage Module, which is housed in the Auxiliary Panel, has the EXAM module mounted in it. EGDM and Attenuator Module Mounting The trio of EGDM boards is set up as Controller (C), Master 1 (M1), and Master 2 (M2) in a redundant control (M2). A group of program pins on the P2 connector control each EGDM's setup. The DSPX transmits data to EGDM C via the EISB in the controller rack about which the master delivers the driving signal to the sensing resistor in the Attenuator Module. 

When C receives this data through the fiber-optic link, depending on whether M2 is the selected driver or M1 is the selected master, C either powers or empowers the relay in the Attenuator Module. A differential signal that identifies the selected master is simultaneously transmitted to M1 and M2. This signal selects the test command source on each module and activates the signal generator on the active master (M1, M2, and C). The active master now gets an oscillator signal from the DSPX via the EISB across the fiber optic link, which it transforms into a positive or negative 50-volt signal. 

This square wave voltage is applied to one end of the sense resistor after being transmitted via cable to the EXAM module. The Sense Resistor in the EXAM module sends an attenuated (10:1) differential signal to the signal conditioner. A straightforward unity gain differential amplifier with a high common-mode rejection ratio serves as the signal conditioner, which is followed by an A-to-D converter (Voltage Controlled Oscillator VCO). A fiber optic transmitter is fed by the VCO. Due to the high common-mode voltage at the sense resistor, the signal conditioner circuitry is powered by an isolated power source to protect worker and equipment safety. When instructed to do so by the control section, the signal conditioner grounds the bridge side of the attenuated Sense Resistor and uses this information to determine the power amplifier output level.

SPECIFICATIONS:

Part Number: IS200EGDMH1A
Manufacturer: General Electric
Series: EX2100
Product Type: Exciter Ground Detector Module
Operating Temperature: -30 to 65 o C
Repair: 3-7 Days
Country of Origin: USA
Availability: In Stock
Manual: GEI-100467

Features 

 Single-Slot Module 

 SNP/SNP-X Protocol (master, slave) 

 CCM Protocol (master, slave, peer) 

 RTU Modbus Protocol (slave only) 

 Supports connection to MS-DOS or Windows

 programming and configuration software package (monitor only) 

 12 Mhz, 80C186 Microprocessor 

 Two RS-422/RS-485 or RS-232 Serial Ports 

 CCM, RTU and SNP/SNP-X Available on Either or Both Ports 

 Simultaneous Communications on Both Ports (up to 9.6 Kbps, or 19.2 Kbps individually) 

 High Performance Access to PLC Memory 

 Three Status LEDs 

 Reset pushbutton 

 Soft Switch Configuration (no switches or jumpers) 

 No Battery Required

Ease of Use

• Simple and powerful instruction set 

• One-axis or two-axis motion programs with synchronized block start 

• Program support for a short motion program (called Program Zero) which can be created in the MS-DOS programming software configuration function 

• Nonvolatile (flash) storage for 10 programs and 40 subroutines 

• User scaling of programming units (in Standard mode only) 

• Generic programming using command parameters as operands for Acceleration, Velocity, Move and Dwell commands 

• Configured with MS-DOS configuration software