Eaton Electrical D77A - Manual (Page 13)

Intelligent Technologies ( IT.) D77A I/O Module Products
MN05002001E For more information visit: www.EatonElectrical.com 5
Dimensional Data
Figure 2 illustrates the dimensional data of the IT. D77A I/O modules.
Figure 2: Module Physical Dimensions, mm [in]
a) Single Wide Module
b) Double Wide Module
Note: Ventilation requirements necessitate a minimum of 50 mm (2 in) on the top and bottom of each module and to each side of a
module grouping.
Power Requirements
The current draw for the IT. D77A I/O modules can be found in the module specification table for each specific module type. When
specifying the 24 volt DC power supply, the power rating must support the sum of all the modules’ current draw added to the system
power requirements.
For more information on the sizing of power supplies, refer to the IT. QCPort System Install and Planning Guide (Publication No.
MN05001002E).
Surge Suppression
IT. D77A Discrete I/O output modules have built-in surge suppression (snubbers) to reduce the effects of transient voltages. When
connecting output devices that have inductive loads (e.g., solenoids, relays, motor starters, etc.) additional surge suppression is
recommended and should be added across the load. The addition of customer-supplied surge suppression for inductive loads
prolongs the D77A output life.
a b
90
[3.5]
45
[1.8]
68
[2.7]
12
[0.5]
90
[3.5]
22.5
[0.9]
D77A-002