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General Wiring
Instructions
Installation
To wire the DewPro MMY31:
1. Unscrew the cap on the terminal side of the unit (has a DewPro
label).
2. Loosen the cable gland located on the side of the unit.
3. Feed the cable through the conduit opening.
Note: Use a standard signal cable size.
4. Retighten the metal cable gland to meet IP 67 and to relieve any
stress on the wire.
5. Verify that a value between 12 and 28 VDC is across the terminals
marked + and –.
Note: This is the voltage that appears across the DewPro terminals,
not necessarily the power supply voltage due to voltage loss in
wire length, displays, indicators, etc.
6. In order to meet EMI/RFI immunity, a two-wire shielded cable
with a common foil shield layer is being used to power the
MMY31. Removing the insulation by 3 inches allows users to pull
back the foil, clamping it between the metal cable gland. The
ground wire must be connected to the internal grounding screw.
Figure 2-5: Electrical Connections
September 2005
Internal GND Connection
External GND/SHIELD Connection
–
24 VDC Nominal (12-28V)
+
2-5
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