Instruction manual

Micro Motion
®
Model D and DT Sensors Instruction Manual 35
Wiring continued
7. Reattach the core processor housing.
8. Shield and shield drain wire(s) should not be grounded at the
transmitter.
• For wiring at the transmitter, see the transmitter Quick Reference
Guide (QRG).
• If you are connecting to an MVDSolo with MVD Direct Connect
™
I.S.
barrier supplied by Micro Motion, the barrier supplies power to the
core processor. Refer to the barrier documentation to identify the
terminals at the barrier.
• If you are connecting to an MVDSolo without I.S. barrier:
- Connect the VDC wires from the core processor (see figure on
page 36) to an independent power supply. This power supply must
connect only to the core processor. A recommended power supply
is the SDN series of 24-VDC power supplies manufactured by
Sola/Hevi-Duty.
- Do not ground either connection of the power supply.
- Connect the RS-485 wires from the core processor (see figure
below) to the RS-485 terminals at the remote host. Refer to the
vendor documentation to identify the terminals.
WARNING
Twisting the core processor will damage the sensor.
Do not twist the core processor.
Power supply +
(Red wire)
Power supply –
(Black wire)
RS-485A
(White wire)
RS-485B
(Green wire)
Core processor housing internal ground screw
• For connections to earth ground when sensor cannot be grounded via
piping and local codes require ground connections to be made internally
• Do not connect shield drain wires to this terminal