Wiring Method - New Cosmos Electric NV-100S Instruction Manual

6-3 Wiring Method

Refer to the gas detector's instruction manual as well.
Turn OFF the indicator and alarm unit's power before opening the cover of the gas detector. Opening the
cover when the power is on may cause a fire.
Ground the equipment's main body and the gas detector.
Make sure that terminal codes of the indicator and alarm unit side and the gas detector side are correct.
Use shielded cables and wire them separated from the power line as much as possible.
When intrinsically safe wiring is needed, connect a Zener barrier (BT-150).
External wiring work for intrinsically safe explosion proof should follow all applicable federal, state, and
local health and safety laws and regulations.
Use a 2C shielded cable of 0.75 mm or 2 mm
be 500 m or less.
Ground the barrier separately. Class A grounding is required.
Keep the intrinsically safe circuit from contact with the non-intrinsically-safe circuit.
(1) Wiring of power source
Prepare a circuit breaker to connect the power source to the indicator and alarm unit.
(2) Connecting to the gas detector
Make sure that terminal codes of the indicator and alarm unit side and the gas detector side are correct.
Use shielded cables and wire them as far from the power line as possible.
(3) Connecting the external alarm contact
Use the external alarm contact only for external alarm equipment and alarm indicators.
Make sure that a load current and voltage do not exceed the contact's capacity.
If you control an interlock, etc. using this equipment's external alarm contact, we are not responsible for any
injuries or damages caused by it.
First alarm contact
Second alarm contact
Trouble alarm contact
Buzzer contact
Terminal for external alarm stop (AS) and external reset (AR)
Alarm can be stopped or reset externally by connecting an external switch.
(4) Connecting the analog output terminal
Gas concentration around the gas detector can be continuously monitored and recorded by connecting a
recorder to the analog output terminal. There are G (+) and H (-) terminals on the terminal block. Standard
output is 4-20 mA. Input resistance of the recorder should be 500
WARNING
CAUTION
CAUTION
No voltage 1c contact (AC100V 2A resistance load) COM
No voltage 1c contact (AC100V 2A resistance load) COM
No voltage 1c contact (AC100V 2A resistance load) COM
No voltage 1a contact (AC100V 2A resistance load) COM
- -
2
for the intrinsically safe circuit. The cable length should
AS
or less.
ZA1 ZB1
ZA2 ZB2
TA TB
BZ
AR N