Datasheet

60 Safety Precautions H7CX Series
■ Precautions for Correct Use
External Power Supply
The capacity of the external power supply is 100 mA at 12 V. When
using a 24 VAC/12 to 24 VDC power supply, reduce the load with the
power supply voltage, as shown in the following diagram (DC power
supplies only).
Power Suppies
• Turn the power ON and OFF using a relay with a rated capacity of
10 A minimum to prevent contact deterioration due to inrush current
caused by turning the power ON and OFF.
• Be sure that the capacity of the power supply is large enough,
otherwise the H7CX may not start due to inrush current (reference
value: approx. 10 A, 1.5 ms at 26.4 VAC) that may flow for an
instant when the H7CX is turned ON.
Power Failure Backup
All data is stored in the EEPROM when there is a power failure. The
EEPROM can be overwritten more than 100,000 times. EEPROM is
overwritten when the power is turned OFF or when settings are
changed.
■ Conformance to EN/IEC
Standards
• Specifications call for basic insulation between the power supply
and input terminals, between the power supply and output
terminals, and between the input and output terminals. (The H7CX-
A@D is not insulated between the power supply and input
terminals.)
• Input and output terminals are connected to devices without
exposed charged parts.
• Input and output terminals are connected to devices with basic
insulation that is suitable for the maximum operating voltage.
10.8
15
100
20
Power supply voltage (VDC)
(DC voltage supply only)
Load current (mA)