GE industrial control system power boards DS200DCFBG1A and DS200DCFBG1B

CONTACTOR DRIVE CIRCUITS

The DCFB board includes relay K2, that serves as a pilot relay for the MD contactor. The SDCC/LDCC board drives the coil of this relay through 1PL-34, 1PL-35, and 1PL-36. Connector MACPL provides 24 V dc FET output to the MD contactor driver.

FIELD/ARMATURE SCR FIRING CONTROL CIRCUITS

The DCFB board contains a gate array circuit that controls the firing of the SCRs in the bridge based upon control signals received from the SDCC/LDCC board through connector 1PL. The gate array is programmed at powerup by a serial PROM. The 5 V outputs of the gate array are converted by gate pulse amplifier circuits into the power level required to feed the forward and reverse gate pulse transformers on the DS200PCCA Power Connect Card (PCCA). These signals are sent to the PCCA board through 5PL. To prevent spurious firing signals, the firing power is removed from the gating circuits until the gate array is programmed and the 5 V power is being regulated.

BOARD GROUPS

There is only one group of the DCFB board, G1. However, the G1 board has two revision levels, G1A and G1B.

APPLICATION DATA

BOARD HARDWARE

The DCFB board includes 12 configurable jumpers (13 on revision BKC and later boards), seven DIP switches, two

LED indicators, a neon light indicator, five testpoints, three fuses, and wiring connectors (18 plug connectors and nine stab connectors) as part of the board. These items are described in the following paragraphs of this section.

CONFIGURABLE JUMPERS (JP) and DIP SWITCHES (SW)

DCFB boards include 12 configurable jumpers (13 on revision BKC and later boards) and seven DIP switches for selection of customer options. Most jumper and DIP switch selections are factory set. The test data sheets supplied with each controller (in the equipment door pocket) show the factory set positions. When a DCFB board is replaced, the jumpers and switches on the new board must be set in the same position as on the board being replaced (unless the instructions state otherwise). See Figure 1 for the locations of the jumpers and switches and Tables 1 and 2 for descriptions.

LED AND NEON LIGHT INDICATORS

Two red LED indicators (CR51 and CR55) and one neon light indicator (LT1) are present on the DCFB board for fuse status indication. See Figure 1 for the location of the indicators and Table 3 for descriptions.

TESTPOINTS

Five testpoints are present on the DCFB board to allow checking of voltage signals, DCFB board common, and ACCT signal status. See Figure 1 for the locations of the testpoints and Table 5 for descriptions.

FUSES (FU1, FU2, and FU3)

The DCFB board includes three protective fuses (FU1, FU2, and FU3) for power supply protection. An indicator will light when any of the fuses is blown. See Figure 1 for the locations of the fuses and Table 4 for descriptions.

BOARD CONNECTORS

The DCFB board receives input signals/power and sends output signals/power via 18 plug connectors and nine stab connectors. See Figure 1 for a DCFB board layout diagram showing the locations of these connectors and see Tables 6 through 22 for signal descriptions of the individual connector pins.

The tables are organized as follows: 

• Table 6 - 1PL Connector   • Table 7 - 2PL Connector 

• Table 8 - 4PL Connector    • Table 9 - 5PL Connector 

• Table 10 - 1CPL Connector    • Table 11 - CNPL Connector 

• Table 12 - CPTPL Connector    • Table 13 - FAPL Connector 

• Table 14 - NPL Connector    • Table 15 - PPL Connector 

• Table 16 - SQPL Connector    • Table 17 - IA1PL Connector 

• Table 18 - IA2PL Connector    • Table 19 - IF1PL Connector 

• Table 20 - IF2PL Connector    • Table 21 - MACPL Connector 

• Table 22 - Stab Connector Terminals