2 4v ac/dc, Analo g o utput, Rs485 – ONICON System-30 MODBUS BTU User Manual
Page 16: Aux pul se input
11451 South Belcher Road, Largo, FL 33773 • USA • Tel +1 (727) 447-6140 • Fax (727) 442-5699 • [email protected]
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
+ -
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tu Mode
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B
tu Mode
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utput
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