IS200ECTBG1A

IS200ECTBG1A is an Exciter Contact Terminal Board manufactured and designed by General Electric as part of the EX21000 Series used in GE Excitation gas turbine control systems. The EX2100 Excitation Control's excitation contact outputs and inputs are supported by the IS200ECTB terminal board. There are two variations; the ECTBG1 board is exclusively used in redundant control while the ECTBG2 board is exclusively used in simplex control. Two trip outputs on each board are used to drive a customer lockout that is managed by the EMIO board. Additionally, the EMIO board is in charge of four general-purpose Form-C contact outputs.

The ECTB is monitoring six auxiliary contact inputs that are energized (wetted) with 70 V dc. Additionally, monitoring and 70 V dc powering are provided for the 52G and 86G contact inputs. Power is provided by both the M1 and M2 controllers for the redundant control.

TRIP RELAY OUTPUTS:

Two trip relays that are often utilized as customer lockout drivers are controlled by ECTBG2, which is driven by the EMIO in M1. The M1 controller supplies 24 V dc to the relay drivers. Refer to the Simplex Terminal Board, ECTBG2, in the previous illustration. One relay is used to drive each customer lockout, and it uses two parallel normally closed contacts. The relays are marked K1M1 and K2M1 on the board. The three inputs drive three relays to regulate a 2-out-of-3 contact voting circuit for redundancy control operation with ECTBG1.

GENERAL PURPOSE RELAY OUTPUTS:

Four general-purpose relay outputs are managed by ECTBG2. The M1 controller supplies 24 V dc to the relay drivers. Each relay output is of the Form-C variety and has common, normally open, and normally closed terminals. These terminals are wired with customer power, which is typically 125 V dc. The relays are labeled K1GP, K2GP, K3GP, and K4GP on the board. The three inputs are voted into the relay driver, which powers the single coil, for redundancy functioning with ECTBG1.

CONTACT INPUTS:

In both the simplex and redundant scenarios, contact inputs are used similarly; however, for redundant control, the inputs are fanned to the M1, M2, and C controllers. Only the M1 controller is connected in simplex control. ECTB operates and monitors six customer-supplied auxiliary contact inputs using 70 V dc from plugs. Resistor isolation and supply to the contacts are present in J13M1 and J13M2. A wetting voltage range of 63 to 84 V dc is possible. The contact's condition is being watched. A red LED is driven by the resulting signal, which also spreads out to M1, M2, and C.

APPLICATION DATA:

The trip relays in controllers M1, M2, and C are K1 and K2. The general purpose relays are K1GP through K4GP. Two screws hold the terminal block TB1 and TB2 in place, and they can be taken out. Cables to the EBKP backplane for connection to the EMIO boards M1, M2, and C are connected using three 25-pin sub-D connectors, J405, J408, and J415 respectively. Plugs J13M1 and J13M2 from the M1 and M2 power supply deliver 70 V dc for contact wetting.