1834-AENTR Gateway Power Consumption

The 1834-AENTR gateway produces two output channels of available power to source the connected flat media network, Network Power (NP) and Switched Power (SP) outputs. Both of these outputs have the ampacity to provide 4 A continuous, maximum. Additionally, the SP channel can provide a boost capacity of 8 A. This intermittent operation can accommodate inrush current that is required to energize contactor coils that are connected to the 1486-CBL flat media cable.
Output Channel
Requirement
Network Power (NP)
Network power passes through from the Gateway.
Switched Power (SP)
Required for each 100-E and 104-E
EtherNet/IP™
 In-cabinet communication interface that is connected within a flat media system. SP is used to energize the 100-E and 104-E electronic coils.

Network Power Ampacity

Each of the communication interfaces (800F, 100/104-E) consumes approximately 30...50 mA of continuous network power (NP). This loading calculation must be accounted for in the total 24V DC input source capacity to the gateway.
When calculating NP power consumption for your
EtherNet/IP™
 In-cabinet system, consider the following calculations:
  • Each end node type requires 30...50 mA of continuous current to operate.
  • For systems using all 40 node connections, plan for 1.2...2 A.

Calculating the Switched Power Ampacity

When applying motor starters to your flat media network, your calculation must be accounted for in the total 24V DC input source capacity to the device. With the proper 10 A source, the gateway can supply an 8 A short-duration boost for switched power (SP).
IMPORTANT:
You must provide 96 W of hold-in energy and 196 W of peak supply to accommodate coil in-rush energy when energizing contactor coils.
Consider the following factors when adding 100-E and/or 104-E AC contactors to your system:
  • The number of contactors that are connected to each system
  • The coil type of each
  • How many starters are simultaneously started
Our Rockwell Automation family of 100-E and 104-E AC contactors offer multiple coil types. The EJ and QJ coils are low consumption and provide lower coil “in-rush” and coil “hold-in” ratings.
TIP:
For a complete list of coil ratings, see the IEC Contactor Specifications Technical Data, publication 100-TD013.
Example: Evaluation Method for SP Calculation
To determine the total demand requirement for SP, follow the instructions in the example below.
Example Calculation: Contactor Energy Consumption
Cat. No. Contactor Range
Coil Rating
Energy Consumption in Watts (W) by Consumption per Contactor
KJ (Standard)
EJ (Low)
QJ (Low, Fast Dropout)
100-E09…100-E38
Hold-in energy
2.2
1.7
1.7
In-rush energy
50
16
6
100-E40…100-E65
Hold-in energy
2
—
—
In-rush energy
25
—
—
100-E80…100-E96
Hold-in energy
2
—
—
In-rush energy
40
—
—
  1. Use the formulas below to calculate the total SP required and total in-rush required.
    Calculation
    (Number of contactors x Hold-in energy) = Total SP required
    (Number of contactors x In-rush energy) = Total In-rush required
    IMPORTANT:
    The in-rush value can be derated if the motors are not started simultaneously.
  2. Use the calculated total values to validate the sizing of the DC power supply that is connected to the device.
    IMPORTANT:
    The DC supply must adequately manage both NP & SP power requirements of your flat media system.

Total Power Consumption of NP and SP

The
EtherNet/IP™
 In-cabinet system is assembled with 40 total connections. The gateway is connected to a 240 W, 24V, 10 A DC power supply (such as Cat. No. 1606-XLE240E). The flat media system includes a total of 15 contactors (Cat. No. 100-E38) with QJ coil types.
The example below illustrates a calculation if all motors are started simultaneously.
Example: Calculation Demands for the Gateway
The source power to the gateway accommodates the following ampacities on the flat media system:
Example Calculation
(Number of network connections x 50 mA) ÷ 1000 = Total amps (A) required for NP
NP Requirement
(40 nodes x 50 mA) ÷ 1000 = 2 A required for NP
The remaining 8 A of capacity can provide 4 A (96 W) of continuous demand for 'hold-in' energy for electronic coils and an additional 4 A peak supply (196 W) for in-rush energy when energizing coil loads. The 8 A total source provides the maximum available amps for a connected system.
Evaluate the Power Requirements of the Number of Contactors
Perform the following calculation to evaluate the number of 100-E contactors connected.
Example Calculation: Contactor Energy Consumption, QJ (Low, Fast Dropout)
Cat. No. Contactor Range
Coil Rating
Energy Consumption in Watts (W)
100-E38QJ00
Hold-in energy
1.7
In-rush energy
6
  1. Use the formulas below to evaluate the hold-in and in-rush energy the system requires.
    Hold-In Energy Required
    Calculation
    Example
    Number of contactors x Hold-in energy watts = Total hold-in energy that is required
    15 quantity x 1.7 W = 25.5 W
    In-rush Energy Required
    Calculation
    Example
    Number of contactors x In-rush energy watts = Total In-rush energy required
    15 quantity x 6 W = 90 W
  2. Use the formula below to calculate watts remaining based on the total required.
    Hold-In Energy Required
    Calculation
    Example
    96 W continuous supply of 1836-AENTR gateway - Total hold-in required = Total watts remaining
    96...25.5 W = 70.5 W
    In-rush Energy Required
    Calculation
    Example
    196 W peak supply of 1836-AENTR gateway - Total hold-in required = Total watts remaining
    196...90 W = 106 W remaining
The system operates as intended if both of the following are true:
  • The total watts remaining is greater than 0.
  • The amount of hold-in and in-rush ampacities are below the maximums that the system can provide.
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