SMC Networks ISE70 Series Manual page 10

Series
Digital Pressure Switch Precautions 1
Be sure to read before handling.
Selection
Warning
1. Monitor the internal voltage drop of the switch.
When operating below a specified voltage, it is possible that
the load may be ineffective even though the pressure switch
function is normal. Therefore, the formula below should be
satisfied after confirming the minimum operating voltage of the
load.
Supply Internal voltage
–
drop of switch
voltage
Caution
1. Data of the digital pressure switch will be
stored even after the power is turned off.
Input data (set pressure, etc.) will be stored in EEPROM so
that the data will not be lost after the pressure switch is turned
off. (Data will be stored for up to 100,000 hours after the power
is turned off.)
Mounting
Warning
1. Operation
Refer to the instruction manual for the operation of the digital
pressure switch.
2. Pressure port
Do not introduce any wire or similar object to a pressure port as
this may damage the pressure sensor and cause a malfunction.
Wiring
Warning
1. Do not wire in conjunction with power lines
or high voltage lines.
Wire separately from power lines and high voltage lines,
avoiding wiring in the same conduit with these lines. Control
circuits including switches may malfunction due to noise from
these other lines.
2. Do not allow loads to short circuit.
Although digital pressure switches indicate excess current error
if loads are short circuited, all incorrect wiring connections
cannot be protected. Take precautions to avoid incorrect
wiring.
3. Connect a DC(–) wire (blue) as close as
possible to the DC power supply GND
terminal.
Connecting the power supply away from the GND terminal can
cause malfunctions due to noise from devices that are
connected to the GND terminal.
4. Do not attempt to insert or pull the pressure
sensor or its connector when the power is
on.
5. A cable with a right-angled connector is also
available.
The right-angled connector faces down (toward the piping).
Do not attempt to rotate the connector, as it is not rotatable.
9
ISE70/75/75H
Minimum operating
>
voltage of load
Pressure Sources
Warning
1. Use the switch within the specified fluid and
ambient temperature range.
Take measures to prevent moisture from freezing in circuits
when below 5°C, since this may cause lead to a malfunction.
The installation of an air dryer is recommended for eliminating
condensate and moisture. Never use the switch in an
environment where there are drastic temperature changes
even when these temperatures are operated within the
specified temperature range.
Operating Environment
Warning
1. Do not use in an area where surges are
generated.
When there are units that generate a large amount of surge in
the area around pressure switches (e.g., solenoid type lifters,
high frequency induction furnaces, motors), this may cause
deterioration or damage to the switches' internal circuitry.
Avoid and protect against sources of surge generation and
crossed lines.
Maintenance
Caution
1. Cleaning of the switch body
Wipe off dirt with a soft cloth. If dirt does not come off easily,
use a neutral detergent diluted with water to dampen a soft
cloth. Wipe the switch only after squeezing the excess water
out of the dampened cloth. Then finish off by wiping with a dry
cloth afterwards.