Precautions For Correct Use - Omron H5CZ Manual

H5CZ

Precautions for Correct Use

• H5CZ models with a 24-VDC/12 to 24-VDC power supply use a
transformer-free power supply method in which the power supply
terminals are not isolated from the signal input terminals. If a non-
isolating DC power supply is used, unwanted current paths may
occasionally burn or destroy internal components depending on
the wiring. Always check the wiring sufficiently before use.
• An inrush current of approx. 10 A will flow for a short time when the
power supply is turned ON. If the capacity of the power supply is
not sufficient, the Timer may not start. Be sure to use a power
supply with sufficient capacity.
• Maintain voltage fluctuations in the power supply within the
specified operating voltage range.
• When turning the power ON and OFF, input signal reception is
possible, unstable, or impossible as shown in the diagram below.
Power ON
supply
OFF
200ms
Input
Impossible
• To allow for the startup time of peripheral devices (sensors, etc.),
the Timer starts timing operation between 200 to 250 ms after
power is turned ON. For this reason, in operations where timing
starts from power ON, the time display will actually start from 249
ms. If the set value is 249 ms or less, the time until output turns ON
will be a fixed value between 200 and 250. The present value
display will start from 250 ms. (Normal operation is possible for set
values of 250 ms or more.) In applications where a set value of 249
ms or less is required, use start timing with signal input.
• Inrush current generated by turning ON or OFF the power supply
may deteriorate contacts on the power supply circuit. Turn ON or
OFF to a device with the rated current of more than 10 A.
• Make sure that all settings are appropriate for the application.
Unexpected operation resulting in property damage or accidents
may occur if the settings are not appropriate.
• Do not leave the Timer for long periods at a high temperature with
output current in the ON state. Doing so may result in the
premature deterioration of internal components (e.g., electrolytic
capacitors).
• EEPROM is used as backup memory when the power is
interrupted. The write life of the EEPROM is 100,000 writes.
The EEPROM is written at the following times:
• When the power supply is turned OFF
• When switching from Timer/Twin Timer Selection Mode or
Function Setting Mode to Run Mode
• Dispose of the product according to local ordinances as they apply.
30
0 to 50 ms 5ms 0 to 500 ms
Unstable Possible Unstable Impossible
Conformance to EN/IEC Standards
• When conforming to EMC standards, refer to the information
provided in this datasheet for cable selection and other conditions.
• This is a class A product. In residential areas it may cause radio
interference, in which case the user may be required to take
adequate measures to reduce interference.
• Basic insulation is provided between the power supply and input
terminals. (No insulation is provided between the power supply and
input terminals for the H5CZ-L8@D.)
Basic insulation is provided between power supply and output
terminals, and between input and output terminals.
• When double insulation or reinforced insulation is required, apply
double insulation or reinforced insulation as defined in IEC 60664
that is suitable for the maximum operating voltage with clearances
or solid insulation.
• Connect the input and output terminals to devices that do not have
any exposed charged parts.