EPRO MMS6120 Speed sensor configuration

EPRO MMS6120 Speed sensor configuration

Verify that the DIN rail is at earth ground potential (connected to a panel that is at earth ground potential). If the DIN rail is not at earth ground potential, connect it to earth ground via a 4 mm² (12 AWG) green/yellow wire or braid, keeping the wire or braid as short as possible.   Snap the FTMs onto the DIN rail.  Snap ground terminals onto the DIN rail next to the FTMs. See Figure 19-7.  Connect a 4 mm² (12 AWG) wire between each ground terminal and the FTM earth ground terminal. Torque to 0.5 to 0.8 Nm (0.37 to 0.59 lb-ft). This wire should be kept short for optimum high frequency grounding. It must be no longer than 150 mm (6 inches) in length.Additionally in some cases, the insulation on the cable between the FTM or relay box and the VME Module may have the insulation removed and a metal “P-clip” used around the cable to ground it within approximately 300 mm (12 inches) of the relay box connector. (This is an additional connection and may not be substituted for the one in note 7.) The requirement for implementing an additional ground is specified in 15.2.6.2 and 15.2.7.2.After both the FTM and the VME module are installed, the cables that connect them may be installed.

Wiring Notes 

It is recommended that 0.5 mm² (20 AWG) or larger twisted, shielded wire be used between each external device and FTM.  Shields inside the cabinet housing the MicroNet should be connected to earth ground at all intermediate terminal blocks, as well as terminated at the control terminal block. The length of exposed wire extending beyond the shield should be limited to 25 mm (1 inch).  Cable shields must be electrically continuous from the signal source to the point the signal wire enters the FTM.  FTM terminals accept wires from 0.25–2.5 mm² (24–12 AWG) wire. Two 0.75 mm² (18 AWG) or three 0.5 mm² (20 AWG) wires can be installed in each terminal. Torque 0.5 to 0.8 Nm (0.37 to 0.59 lb-ft).  Take care to prevent ground loop wiring when interfacing to other devices.  Shields should be terminated to the cabinet at the entrance/exit point with a grounding bar or similar low impedance ground. The ground bar may be either a direct connection to the cabinet frame protective earth or an AC (capacitor ~0.01 μF) connection where 0.01 μF capacitors are between the bar and cabinet frame/panel every 150–200 mm (6–8 inches) of bar length. Shield termination should be only directly grounded to chassis at one end, preferably the MicroNet Cabinet end.  Do not place shielded wires in the same conduit as high voltage or large current-carrying cables.

Shields and Grounding

An individual shield termination is provided at the FTM terminal block for each of the analog inputs and analog outputs. All of the analog inputs and outputs should be wired using shielded, twisted-pair wiring. The shields should be connected to earth ground at one point only, as well as terminated at the FTM terminal block; which will typically AC couple the shield to earth ground.

Discrete Inputs leaving the cabinet housing the MicroNet should be grouped together based on field signal source location and be shielded as a group. The shield termination should be to the chassis ground on the cabinet housing the MicroNet system; the shield termination should only be to the MicroNet’s cabinet. The Discrete Inputs should also have a common wire (Wetting voltage common), grouped with them inside the shield. The field end of the common wire should be un-terminated, unless wetting voltage is provided remotely in the field. Relay Driver/Discrete Outputs leaving the cabinet housing the MicroNet should also be grouped together based on field relay coil or input location and be shielded as a group. The shield termination should be to the chassis ground on the cabinet housing the MicroNet system; the shield termination should only be to the MicroNet’s Cabinet. The Discrete Output wires should also have a common wire (coil voltage common), grouped with them inside the shield. The field end of the common wire should be un-terminated, unless coil voltage is provided remotely in the field.

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