Honeywell Searchline Excel Technical Handbook page 19

MAN0530 Issue 10 - 11/09
2104M0506
3. INSTALLATION AND OPERATION
k. All electrical equipment connected to the gas detector should comply with EN61000-6-
3:2007 and EN61000-6-2:2005.
l. The 24V supply should be free from large transients and fluctuations.
m. The field cabling conductors should have sufficient cross sectional area to ensure that
the minimum supply voltage applied to the gas detector is 18V at a current of 420mA.
This corresponds to a maximum round loop impedance of 14 ohms for a nominal 24V
system supply.
n. Receivers should not be installed in close proximity to the antennae of high powered
radio, radar and satellite communication equipment.
The following diagrams show typical earth bonding arrangements for various installations.
3.3.2 Receiver Connections via DVC100(M) MK2
The earth bonding arrangement must ensure
that the maximum peak voltage between the unit
case earth and any field cable conductor is less
than 350V. Voltages in excess of this can cause
permanent damage to the unit's RFI protection
filters.
Field Wiring
+24VDC IN (Terminal 1)
4-20mA (Terminal 5)
MOD BUS Drain (Terminal 9)
MOD BUS A (Terminal 10)
MOD BUS B (Terminal 11)
Note: Using metal cable glands will connect the screen of the cable to the Excel Body.
0V (Terminal 3)
Earth Terminal
Excel Receiver
Earth Terminal
Wiring +24VDC (Red) (Terminal 2)
0V (Black) (Terminal 4)
4-20mA (White) (Terminal 6)
RS485 (A) (Orange) (Terminal 7)
RS485 (B) (Blue) (Terminal 8)
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Searchline Excel