7
4-20mA Output Card Wiring
A.
Isolated Configuration
For isolated 4-20mA outputs an external power source for the loop must be supplied. JP1 and JP2 on the
board must not be jumpered when an external power source is being supplied. The external power source
must not exceed 24 volts DC and will connect onto the card on connector J1 on the postion marked Loop
Supply.
B.
Non-isolated Configuration
For non-isolated 4-20mA outputs the controller will supply the power for the loop. JP1 and JP2 must be
jumpered and no connections are made to the Loop Supply points.
Note:
If multiple outputs are being connected to a single energy management system the negatives or commons
MUST remain isolated from each other.
Does not apply to Rev. D or later.
4-20mA Input Card Wiring
The 4-20mA input card requires that the external device sending the 4-20mA input signal(s) supply the power
for the loop. The external power source must not exceed 24 volts DC.
Summary of Contents for MegaTron
Page 30: ...30 Notes Common boiler blowdown valve connections ...
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