Nematron M-Series Monitors - Manual (Page 13)

13
3 2 1
3 1 2
TOP VIEW
FRONT VIEW
PHOENIX CONTACT P.N. 1777992
Connecting Power to the M-Series
Connecting power to the Panel Mount and Rack Mount M-Series units:
The M-Series units are powered from 100-240 VAC, 50/60 Hz or optionally from 24 VDC.
Damage will occur if 100-240 VAC power is connected to an M-Series unit equipped with the 24
VDC input power option. ePC-Series equipped units with the 24 VDC option will have a “-24” suffix in
their model number such as M1500-24 or M1900T-24.
Because the M-Series units (not –EN option) are UL 1604 listed for Hazardous Location use,
(Class I Division2, Groups A, B, C, D; Class II Division 2 Groups F and G, Class III), the units do not have
a power switch for switching off supplied power. Consideration should be give to the installation of an
appropriately rated external power switch if the application requires powering off the M-Series unit.
Power is connected to the units through a removable Phoenix Contact plug (Phoenix Contact
P.N. 1777992) that allows for screw termination of field wiring. This plug is included with each unit and is
keyed to prevent installation in a unit with the wrong input voltage rating. When Field Wiring to these
terminals the use of 18 AWG or greater (12 AWG maximum) copper wire with 60ºC or 60/75ºC wire
insulation and the terminal tightening torque of 7.0 lb/in. (0.79 Nm) is required. The terminal screws
are shown in “Top View” below. Connect the field wiring according to the appropriate voltage in the table
below. Strip the wire insulation back on each conductor 6.5 mm (0.26 in) and assure that the remaining
wire is twisted together, not frayed, and clean. If an outer jacket over each conductor is utilized then strip
the outer jacket back an additional 19.0 mm (0.75 in) as shown in figure below. When installing the
conductors take care that there are not any stray strands of wire that can contact an adjoining connection.
Tinning of each lead can be utilized to prevent frays if desired. Optionally the included protective cover
can be utilized to prevent electrical shocks when handling the power connector and provide strain relief
for each conductor connection (see the following section for installation instructions). After the
connections are made, make sure the plug retention screws (the two screws shown in the “Front View”
below) are securely tightened. This will prevent the plug from pulling out. The use of these screws is
mandatory when the unit is utilized in applications requiring hazardous locations approvals.
FRONT VIEW
PIN NUMBER 100 VAC – 240 VAC INPUT 18 VDC – 36 VDC INPUT
1 AC Line Input + DC Input
2 AC Neutral Return - DC Return
3 Protective Earth Ground Protective Earth Ground
3 1 2