ONICON System-30 MODBUS BTU - Manual (Page 16)

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System-30 BTU Measurement System MODBUS RTU RS485 04/14 - 0583-1 / 18345
Page 16
3.3.2 Electrical Wiring
Connect all Btu meter signal outputs to terminal strip TB1 and/or TB4 (optional
communication output) as shown below. Then connect the 24 V AC/DC input power to
terminal strip TB1. The standard SYSTEM-30 is configured for 24 V AC 50/60 Hz
operation or 24 V DC operation. Do not connect the 24 V AC/DC source until all other
signal connections have been made and verified.
CAUTION
Only qualified service personnel should make connections between the System-30-MOD BTU
Meter and the user’s external equipment. ONICON assumes no responsibility for damaged caused
tot he external equipment as a result of an improper installation.
!
1 2 3 4 5 1 2 3 4 5 6 7 8
TB1 TB4
+ -
B
tu Mode
1C
on
tact
B
tu Mode
2 C
ontact
} }
}2
4V AC/DC
+ -
}Analo
g O
utput
+ -
}RS485
+ -
}Aux Pul
se Input
RS4
85
Comm
on