Product Introduction
The Simplex RTD Input (IS200DRTDH1A) terminal board is a compact RTD terminal board designed for DIN-rail mounting. The board has eight RTD inputs and connects to the VRTD processor board with a single cable. This cable is identical to those used on the larger TRTD terminal board. The terminal boards can be stacked vertically on the DIN-rail to conserve cabinet space. Two DRTD boards can be connected to VRTD for a total of 16 temperature inputs. Only a simplex version of the board is available.
Technical Specifications
| Manufacture | General Electric(GE) |
| Model | IS200DRTDH1A |
| Part Number | IS210DRTDH1A |
| Description |
Simplex RTD Input (DRTD) terminal board
|
| Origin | USA |
| Dimension | 35*25*8cm |
| Weight | 0.75kg |
Product Details
Installation：
Mount the plastic holder on the DIN-rail and slide the DRTD board into place. Connect the wires for the eight RTDs directly to the terminal block. The Euro-block type terminal block has 36 terminals and is permanently mounted on the terminal board. Typically #18 AWG wires (shielded twisted triplet) are used. Terminals 25 through 34 are spares. Two screws, 35 and 36, are provided for the SCOM (ground) connection, which should be as short a distance as possible.
Application Notes:
– Optional Ground: connnect the “B” wire to ground;
– RTD Group wiring, that is sharing the “B” wire;
tie the “B” wires together at the RTDs,
tie the “Sigxx” signals together at the TRTD termination board, and interconnect with one wire.
How to operate：
The noise suppression on DRTD is similar to that on TRTD. High-density Euro-block type terminal blocks are permanently mounted to the board, with two screw connections for the ground connection (SCOM). An on-board ID chip identifies the board to VRTD for system diagnostic purposes.
DRTD supplies a 10 mA dc multiplexed (not continuous) excitation current to each RTD, which can be grounded or ungrounded. The eight RTDs can be located up to 300 meters (984 feet) from the turbine control cabinet with a maximum two-way cable resistance of 15 Ω.
VRTD’s VCO type A/D converter uses voltage to frequency converters and sampling counters. The converter samples each signal and the excitation current four times per second for normal mode scanning and 25 times per second for fast mode scanning, using a time sample interval related to the power system frequency. Software in the digital signal processor performs the linearization for the selection of 15 RTD types.
RTD open and short circuits are detected by out of range values. An RTD that is determined to be outside the hardware limits is removed from the scanned inputs to prevent adverse effects on other input channels. Repaired channels are reinstated automatically in 20 seconds or can be manually reinstated.
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