Riken Keiki GD-F3A-SC-A, Operating Manual

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11
GD-F3A-SC-A
Example of intrinsically safe system
・ Do not alter, noｒ remodel the parts, etc.
・ Use the circuit breaker as for the power of indicator/alarm unit. Also it shall be mounted
nearby indicator/alarm unit and be specified that it is for power interruption of
indicator/alarm unit.
・ Ground the zener barrier separately corresponding to the A-class grounding with ground
resistance of 10Ω or less.
・ Use the specified cable.
・ For system installation, operation and maintenance, take care not to damage the intrinsically
safe design.
・ The power of the indicator/alarm unit shall be turned on after completion of all wirings. If
each wiring is carried out in the power on condition, short-circuit between terminals or an
electrical shock may be occurred.
* NOTE
When wiring, read the operating instructions for the connected indicator/alarm unit.
1
3
2 4
Detector head
Indicator/alarm
unit
Zener barrier
（
MTL7728ac
）
Max. 2 km
Hazardous area
Non-hazardous area
Connection cable
Connection
cable
WARNING
CAUTION
！
CVVS 1.25mm
2
or
equivalent(max 250m)