2
2.1.2 Making a NEMA-4 Mounting
Panel Details
The unit can be mounted into panels with a depth of 4”(105mm). It is recommended that the unit be mounted on
the front panel of a steel enclosure, through an appropriate opening*.
•
Allow a clearance of 1”(25mm) around the sides of the unit for mounting hardware.
•
Allow clearance for cable connections to the back of the unit.
•
Unit depth may vary according to cable type used. Typically, plan a depth to accommodate at least
4”(105mm) behind the panel.
NEMA-4 Mounting
Put the unit through the panel cut out. Slide the clamps into the 6 holes provided around the case. Tighten the
clamping screws in an even pattern until the unit is secured in the panel.
Caution!
Do not over tighten mounting clamps!
Note: Specifications
To seal to NEMA-4 specifications, all supplied mounting clamps must be used and panel
cannot flex more than 0.010”.
2.1.3 Environmental Considerations
The MMI8000 Series units are designed for indoors use as built in displays. Make sure that the displays
are installed correctly and that the operating limits are followed (See Specifications).
•
Do not operate the unit in areas subject to explosion hazards due to flammable gases, vapors
or dusts.
•
The unit should not be installed where fast temperature variations and/or high humidity are
present. This causes condensation of water in the device.
•
Do not install these terminals in environments where inflammable gases are present.
2.2 Power Connections
Make sure that all local and national electrical standards are met when the installing the unit.
Contact your local authorities to determine which codes apply.
2.2.1 Power Requirements
Power
MMI8000 units are powered by DC power only. The specified voltage range is 24±5% Volts DC.
This insures compatibility with most controller DC systems.
The power conditioning circuitry inside the unit is accomplished by a switching power supply.
The peak starting current can be as high as 700mA.
Fusing
Requirements
If the display does not come on within 2 seconds of power up, remove power. An internal fuse
prevents damage if the polarity of the DC power is incorrect. Check wiring to insure proper
connections and try to power up again.
High Voltage
Caution
An Internal fuse prevents damage for over voltage condition however it isn’t guaranteed.
DC voltage sources should provide proper isolation from main AC power and similar hazards.
Caution
Emergency
Stop
A Hard-wired EMERGENCY STOP should be fitted in any system using an MMI8000 to comply
with ICS Safety Recommendations.
Caution
Supply Voltage
Do not power the MMI8000 and inductive DC loads, or input circuitry to the controller, with the
same power supply.
Note: The 24 VDC output from
some controllers may not have enough current to power the
MMI8000.
