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5. Installation
5. Installation
GTC-520A
Instruction Manual
5.2. Configuration of signal terminal
■ Installation in the field or opening or operation of the cover for the installed gas leakage detector and receiving panel
should never be allowed to be performed those other than approved users or the person of the headquarters
in charge of installation and repair. Otherwise, serious damages can be inflicted to life and property such as fire
or explosion accidents. Also make sure to shut off the power supply and conduct operation after checking whether
explosive gas remains or flammable substances exist in the surroundings.
■ Connect 4-20mA output and External Reset, RS485, outside gas detector by using CN6 terminal.
Terminal configuration is as shown in the following table.
■ Use the RS-485 dedicated cable for RS-485 Cable, and use Shield cable of CVVS or more than CVVSB 0.75sq
for connecting cable between 4~20mA Output and Detector!
5.1. Configuration of power supply
■ When DC24V is to be used, a separate request should be made upon product ordering. When released as
DC24V Type per user request, connect (+) of DC24V (+) toL1 of CN9, and (-) to L2 for use.
■ When the product Cover is separated, the terminal box connecting power supply within PCB and various signals
appear.
■ Connect AC power supply (85~260V 50/60Hz) to CN9 as shown in the following figure.
[Figure 2. Configuration of GTC-520A power supply]
[Table 2. Description of CN6 terminal]
Note1) When RS485 Option is not available, RS485 function does not operate.
FUNCTION
OUTSIDE
TERMINAL NAME
DESCRIPTION
4-20mA
Output
VISO
Outside power supply input terminal for 4-20mA Sink Driver
mA
Output terminal for 4-20mA Source Driver
SENSOR
Flammability sensor
Toxicity sensor
O2 sensor (galvanic type)
1
Red Cable
Blue Cable
N.C
2
White Cable
Red Cable
Red Cable
RESET
+
arm reset function is performed when outside reset terminal and + terminal
are short - circuited with - terminal.
-
- terminal of outside reset switch
RS485
A
RS485 A terminal ( TRXD + or P)
B
RS485 B terminal ( TRXD + or N)
