Chapter 2: Installing the Monitor
Selecting a Location
PHM/PM User Guide
2-3
Electrical Guidelines
To minimize unwanted electrical interference, select a location away from
machinery that produces intense electrical noise (arc welders, for
example). If you cannot avoid electrical noise, isolate input power to the
unit and separate all data communication cables from AC power lines.
Important
Use the monitor ground stud to connect the unit to a suitable
ground reference, such as earth ground or building steel.
This ensures the unit is in compliance with immunity and
emissions requirements necessary for proper operation.
All serial communication cables should be 100% shielded with the shield
tied to chassis ground only at one end of the cable.
The monitor’s electrical specifications are shown in the table below.
Make sure that your power source is compatible with the monitor before
starting the unit.
The monitor accepts DC input only. To apply AC power, you must use an
AC adapter. You can purchase an AC adapter from your local distributor.
Caution: The monitor’s power supply automatically detects the input
voltage level and adjusts accordingly. However, always use reliable
sources of power and isolate all communication cables from AC power lines
to enhance noise immunity.
Field Terminal Wiring Requirements
In order to comply with UL requirements, use copper wire with 60C or
60/75C insulation and a tightening torque of 7.0 lb/in. (0.79 N-m) when
connecting field terminal wiring to the monitor.
Category
Specifications
Input voltage
24 VDC @ 2A max
Power requirements
48 Watts maximum
Fuse rating
4A (very fast-acting type)
