4
– Installation
59
OLCT 80 in RS485 network topology (Modbus)
Figure 42: wiring in RS485 network topology (Modbus).
Item
Description
A.
24 VDC power supply. RS485 line.
B.
Auxiliary input #1, 4-20 mA, 24 VDC.
C.
Auxiliary input #2, 4-20 mA, 24 VDC.
D.
Fault relay output. Dry contact. Interrupting capacity: 30 VDC - 250 VAC
– 2A.
E.
Alarm #2 relay output. Dry contact. Interrupting capacity: 30 VDC - 250 VAC
– 2A.
F.
Alarm #1 relay output. Dry contact. Interrupting capacity: 30 VDC - 250 VAC
– 2A.
G.
120
Ω end-of-line resistor. (To be connected if the sensor is the last in the line.)
H.
RS485 line output to subsequent sensor. Parallel terminal on A2.
J.
24 VDC power output to the next sensor in series. Parallel terminal at A1.
Recommended cable type:
Shielded cable designed for RS485 communication, e.g., Belden 3841 cable.
Grounding the housing
Connect the housing's earth terminal to the ground in accordance with
regulation. The
OLCT 80
has a dedicated terminal for grounding located on the
outside of the housing (Figure 2, 3).
Closing the cover
The cover must be tightly closed before connecting the cable to the terminal of
the central system. Insert and tighten the locking screw (Figure 2, 4).
Summary of Contents for olct 80
Page 1: ...1 User manual OLCT 80 Part Number NPO80GB Revision E 1 The Fixed Gas Detection Experts...
Page 6: ...Table of Contents vi...
Page 10: ...1 Overwiew 4...
Page 18: ...2 Transmitter Overview 12...
Page 22: ...3 Menus 16 Figure 15 the OLCT 80 s sub menus under AFF MES DATE TIME and PROG...
Page 23: ...3 Menus 17 Figure 16 the OLCT 80 s sub menus under MAINT CALIBRA 4 20mA INFOS and TEST...
Page 42: ...3 Menus 36 Figure 26 RELAY 1 menu Press ESC repeatedly to return to the reading display...
Page 58: ...3 Menus 52...
Page 74: ...5 Wireless Version 68...
Page 82: ...7 Pre installation Hardware Configuration 76...
Page 84: ...8 Preventative Maintenance 78...
Page 90: ...10 Accessories 84...
Page 96: ...12 EU Declarations of Conformity 90 OLCT 80 without antenna...
Page 97: ...12 EU Declarations of Conformity 91...
Page 98: ...12 EU Declarations of Conformity 92 OLCT 80 with antenna...
Page 99: ...12 EU Declarations of Conformity 93...
Page 100: ...12 EU Declarations of Conformity 94 IR20 remote control of the OLCT 80...
Page 108: ...13 Technical Specifications 102...
Page 116: ...14 Special instructions for use in explosive environments and fonctional safety 110...
Page 119: ...113...