Rockwell Automation 1794-IJ2XT FLEX I/O Frequency Input Modules User Manual - Manual (Page 73)

Publication 1794-6.5.11 - September 2011
Schematics 63
.
DC to DC Converters – 24V DC Power Supplies
The module provides two 24V (±10%) power sources rated at 15 mA each.
Each power source can power one Bently Nevada 3300 – 5 mm (0.197 in.) or
8 mm (0.315 in.) – Proximity Transducer.
D5
Q1
Output 0
Output
TEMPFET s
DC
Supply
Supply return
10-31.2V
Alarm
R
load
1A max
D6
RT1
Output channel
10 KW
3.83 KW
3.83 KW
6.8V
Customer supplied power, ranging from 10V…31.2V DC, is connected internally to the power output transistor.
When an output is turned on, current flows into the source, out of the drain, through the load connected to the
ground of the customer supply (customer return). Diode D6 protects the power output transistors from damage due
to inductive loads.
Output Q1 is a thermally protected FET and will turn off @ 3A, approximately. After an output goes into thermal
shutdown, you must fix the cause of the shutdown and toggle the outputs ON and OFF to reenergize the output.
RT1 protects D6 and Q1 if power supply polarity is reversed.
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24V DC from
terminal base
DC/DC
converter
Channel 0
current limit
Channel 1
current limit
Frequency 0
Gate 0
15 mA
15 mA
30 mA
max
Frequency 1
Gate 1
15 mA
15 mA
30 mA
max
To customer devices
The frequency input module isolated power supply consists
of 1 isolated 24V DC power supply that provides 2 current
limited outputs of 30 mA max (1 for each channel).
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