Bacharach GDA-1600 Manual De Propietario
Instruction 5700-9001
GDA-1600 16-Channel Controller
29
4.2.1 Optional Analog Input PCB # 5700-0004
Many transmitters or sensors have analog output signals and the 12 bit Analog Input
PCB, shown in Figure 4.3 is available to accept these. TB1, with 24 positions, offers 3
terminals per channel for distributing power and receiving analog inputs. These are EXC
and HI / LO inputs. TB2, with only two positions, is for connecting the power supply for
powering external transmitters. Precision 100 ohm resistors (R1 – R8) between each
channel’s IN LO and IN HI terminals are socketed termination resistors for 4-20mA
inputs. These may be removed if voltage inputs are to be applied.
EXC and IN LO terminals are bussed together internally. EXC terminals are tied
EXC and IN LO terminals are bussed together internally. EXC terminals are tied
directly to TB2-1 (+) and IN LO terminals are tied to TB2-2 (-). Bussing allows
transmitter power to be brought into the system at a single point (TB2) and distributed
back out at each channel’s EXC / IN LO terminals to simplify field wiring. Figure 4.3
includes typical wiring to 2 & 3 wire 4-20mA transmitters.
JP1 determines if the 8 analog inputs are applied to channels 1-8 or channels 9-16.
JP1 determines if the 8 analog inputs are applied to channels 1-8 or channels 9-16.
Connecting more than 8 analog inputs requires 2 PCBs with JP1 of one of the PCBs set
for channels 1-8 and the JP1 of the other set for channels 9-16.