GE VMIVME-7751 Gas turbine interface module

These jumpers can be set independent of each other. You can select the filter action and voltage for each channel and for the gate/reset input independently. The high speed operation is the preferred mode of operation for the 1771-VHSC module. Use this mode when the inputs are driven by devices such as encoders or line drivers. Use the filter mode on the inputs when a mechanical switch is providing the input. The filter provides de-bouncing for the mechanical switch. The frequency of counting must be less than 100Hz when the filter mode is selected.

Use these jumpers to match the operation 

of the module with the input supplied. Settings are shown in Figure 2.2. To set the jumpers, proceed as follows: 

1. Remove the four screws securing the side cover to the module and remove the covers.

 2. Using your fingers, reposition the jumpers associated with each input channel according to your requirements. Refer to Figure 2.2.

3. Reposition the cover and secure with the 4 screws removed in step 1.

Connecting Wiring

Connect your I/O devices to the 40-terminal field wiring arm (cat. no. 1771-WN) shipped with the module (Figure 2.3). Attach the field wiring arm to the pivot bar at the bottom of the I/O chassis. The field wiring arm pivots upward and connects with the module so you can install or remove the module without disconnecting the wires.

The sensor cable must be shielded. The shield must: • extend the length of the cable, but be connected only at the 1771 I/O chassis • extend up to the point of termination Important: The shield should extend to the termination point, exposing just enough cable to adequately terminate the inner conductors. Use heat shrink or another suitable insulation where the wire exits the cable jacket.

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