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5. Installation
5. Installation
GTC-550
Instruction Manual
[Figure 3. CN6 Terminal Configuration]
[Figure 2. GTC-550 Power Configuration]
■
It is prohibited for an individual, other than an approved user or a technician responsible for installation and repair
from the head office, to install a gas leak detector on site or open the cover of the installed gas leak detector and
manipulate it. This may cause serious loss of life and property from fire, explosion, and etc. In addition, please
check whether there is any remaining explosive gas or combustible material in the surroundings. Power must be
turned off before performing work.
5.1. Power Configuration
■
When it is desired to use DC24V, a separate request must be made when ordering the product. When the product
has been delivered as DC24V-Type upon a customer request, (+) and (-) of DC24V shall be connected to L1 and
L2 or CN9, respectively.
■ After detaching the equipment cover, terminal block that connects power and various signals within PCB appears.
■ Connect AC Power (85~260 V 50/60 Hz) to CN9 as shown in the figure below.
5.2. Signal Terminal Configuration
■ Using CN6 terminal, connect 4~20 mA output, External Reset, RS485, and external gas detector.
Terminal configuration is as shown in the table below.
■ RS-485 cable uses a cable designated for RS-485 and cables for 4~20 mA output and detector connection must
use a shield cable with CVVS or CVVSB 0.75 sq and higher.
[Table 2. CN6 Terminal Description]
Note 1) When RS485 Option does not exist, RS485 function does not operate.
FUNCTION
TERMINAL NAME
DESCRIPTION
4-20mA
Output
VISO
External power input terminal for 4~20 mA Sink Driver
mA
Output terminal for 4~20 mA Source Driver
SENSOR
Combustible Sensor
Toxic Sensor
O2 Sensor
(Galvanic Method)
1
Red Cable
Blue Cable
N.C
2
White Cable
Red Cable
Red Cable
RESET
+
External Reset S/W + Terminal. When + and - terminals short, alarm reset function
operates.
-
External Reset S/W - Terminal
RS485
A
RS485 A Terminal (TRXD+ or P)
B
RS485 B Terminal (TRXD+ or N)
