Ebtron GTC116 Installation Manual - Ebtron
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4 GTC116 ANALOG OUTPUT AND NETWORK CONNECTIONS
This section contains analog and network output wiring instructions for the GTC116 transmitter with RS‐485 and
Dual Analog outputs.
4.1 GTC116 ‐ ANALOG OUTPUT WIRING
Analog output connections are made at the top left of the transmitter main circuit board OUTPUT connector as
shown in Figure 6. Independent linear analog outputs are provided for airflow at OUTPUT terminal 1, and for
temperature (or alarm) at OUTPUT terminal 2, each with over voltage and over current protection. Airflow and
temperature outputs are field selectable for either 0‐5/0‐10VDC or 4‐20 mA. The OUTPUT terminal 2 can be
assigned as an Alarm output to provide an active high, active low or trouble alarm output. Outputs are galvanically
isolated from the main power supply to permit simple integration with virtually all building automation systems.
When configured for 4‐20mA output, the GTC116 is a “4‐wire” device. The host controls shall not provide
any excitation voltage to the output of the GTC116.
For the analog outputs, shielded cable is recommended. To wire the analog outputs, slide the cover plate up and
off of the enclosure. Ensure that the power switch is in the “OFF” position. Connect signal wires for airflow rate
and temperature (or alarm) to the small, three position output terminal labeled “OUTPUT” on the upper left hand
side of the main circuit board as shown in Figure 6.
Figure 6. GTC116 Combination Analog/RS‐485 Transmitter Interior Detail
ON
OF
F
OFF ON
ESC
ENTER
CONTRAST
REPLACE WITH
1.5 AMP
FAST ACTING ONLY
OUTPUT
1 2 COM
POWER
24VAC IN
L2 L1
ON
OFF
RS-485
NET COM
NET -
NET +
ON
TERM
F1
F2
VDC mA
OUT 1
OUT 2
RS-485
ANALOG OUTPUT
1: Airflow
2: Temperature/Alarm
COM: Common
(RS-485 output below)
Transmitter Status LED
(Green 1 second flash normal;
2 second flash for trouble)
Combination Analog/
RS-485 Output Card
P.N. 800-1825
Analog Output Fuses
F1=OUT1
F2=OUT2
UL Listed 0.125 Amp
P.N. 800-1105 (Qty:10)
NET COM*
NET -
.
NET +
RS-485
OUTPUT
(For Analog Output, see
separate output above)
Power Switch
LCD Display
SW1 (for OUT1)
Airflow Output Signal Select
SW2 (for OUT2)
Temp./Alarm/Trouble Output
Signal Select
VDC: 0-5/0-10VDC or
mA: 4-20 mA
RS-485 Activity LED
(Green LED indicating RS-485 network activity)
*CAUTION
The common for the ANALOG and the RS-485 outputs must be at the same potential.
For ISOLATED RS-485 output, COM connection MUST BE CONNECTED to network common.
For NON-ISOLATED output, COM connection MUST BE CONNECTED to the common ground that other network devices are using (typically the
ground side of the 24VAC supply - L2 of the POWER terminals). Refer to RS-485 Network Wiring Connections paragraph for additional detail.
off
off
off
off
No Termination
off
off
End of Line
off
off
Fail-safe Bias
!
!
SW3 TERMINATION Switch