8PFA Omron, 8PFA Datasheet - Page 8

• Manufacturer Part Number: 8PFA
• Description: RELAY SOCKET MM2
• Manufacturer: Omron
• Series: A16r

Specifications of 8PFA

• Accessory Type: Socket - Track Mount
• Lead Free Status / Rohs Status: Details
• For Use With/related Products: Omron Photosensors

Safety Precautions for Floatless Level Controllers
Precautions for Safe Use
Do not use the Controller in locations subject to explosive or
combustible dust, combustible gas, flammable vapors, corrosive gas,
excessive dust, salt water spray, or water drops.
Precautions for Correct Use
● Operating Environment
• Use and store the Controller within the rated ambient operating
• Use the Controller according to the characteristics specified for
• Install the Controller as far as possible from devices that generate
● Tighten Terminal Screws to the Specified Torque
● Use a Power Supply with Minimal Voltage Fluctuation
Avoid connection to a power supply with a voltage fluctuation greater
than or equal to +10% or 15%.
● Consider the Ambient Temperature
Do not install the Controller where it may be exposed to a
temperature of 55 C or higher or a humidity of 85% or higher. In
particular, install the Controller away from heat-generating
equipment incorporating coils or windings. Do not use the Controller
outdoors or in locations subject to high humidity, corrosive gases, or
direct sunlight.
● Avoid Vibration and Shocks
Do not subject the Controller to vibration or shocks which can cause
chattering problems. Do not install the Controller near contactors that
generate severe shocks while the contactors are in operation.
● Do Not Test with a Megaohmmeter
During insulation resistance measurements, never apply the
megaohmmeter across the Electrode terminals.
● Use Self-holding Electrodes
• Use Self-holding (E2) Electrodes when contactor open/close
• Be sure to turn OFF the power supply before replacing the plug-in
● Short Wiring in Electrode Circuit
• Keep the wires connecting the Controller to Electrode Holders as
• The thicker the cables, the shorter the permitted wiring length. The
Do not touch the terminals while power is being supplied.
Doing so may occasionally result in electric shock.
Do not attempt to disassemble, repair, or modify the
product while the power is being supplied. Doing so may
occasionally result in electric shock.
temperature, ambient operating humidity, and storage temperature
ranges specified for individual models.
individual models for vibration, shock, exposure to water, and
exposure to oil.
strong high-frequency noise (such as high frequency welders or
sewing machines).
control is carried out. If E1 Electrodes are used, ripples on the
liquid surface can cause incorrect contactor operation and damage
to the contacts.
models.
short as possible. If long leads are used, the floating capacity of the
leads, and abnormal surges or noise in the Electrode circuit can
cause malfunctions.
length of the cable connecting the Controller and Electrode is
specified in the Controller datasheet as a guideline assuming that a
600-V VCT 0.75-mm
indicate that the actual wiring length using VCT 3.5-mm
cable laid over the ground is 50% of the specified length for
When fitting crimping terminals to terminal screws, use a
tightening torque of between 0.45 and 0.6 N·m
http://www.ia.omron.com/
2
, 3-core cabtire cable is used. Test results
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, 3-core
● Keep Power Cables Separate from the Electrode Circuit
Do not pass the leads for the Electrode circuit through the same
duct, or near to, high-tension cables or power cables. This can cause
noise which leads to malfunctions.
● Ground Correctly
Ground the common Electrode terminal to reduce the effects of
noise.
● Use a Surge Suppressor
Connect a 61F-03B(-04B) Surge Suppressor with the Controller’s
Electrode terminals to protect the circuit from surges. This is
particularly important in lightning-prone areas. To further improve
protection, install a commercial surge suppressor in the power
supply to eliminate surges in the power system.
(Refer to 61F-03B/-04B.)
● Consider the Response Times
The Controller requires a response time not exceeding 80 ms for
operation or 160 ms for reset. Take these response times into
account in cases where precise sequence control is required.
● Consider the Liquids to Be Controlled
• The Controller cannot be used for any liquid that has almost no
• The Controller cannot be used for any flammable liquid such as
● Do Not Share Electrodes
Do not connect a single Electrode to more than one Controller. If the
phases of the 8-VAC Electrode-circuit power supplies are opposite to
each other, as shown in Fig. 1, an internal close circuit (return circuit)
is created (indicated by the arrows). The Controller may malfunction
regardless of the liquid level when the Controller power is turned ON.
This problem can be overcome by matching the power supply
phases, as shown in Fig. 2, but in this configuration the internal
impedance of the Controller calculated from the Electrode will be
approximately half as large as the internal impedance of a single
Controller. Maintain sufficient clearance between Electrodes
connected to separate Controllers so that they do not interfere with
each other. Common leads, however, can be connected to the
ground Electrode.
Fig. 2 Match Phases
Fig. 1 Internal Closed Circuit
general-purpose applications and 80% of the specified length for
long-distance applications. When selecting cable specifications,
remember that the wiring length is further decreased for
underground cables and larger diameter cables because of the
increased floating capacity with the ground.
conductivity such as sewage containing oil.
gasoline, kerosene, or heavy oil.
(c)Copyright OMRON Corporation 2007 All Rights Reserved.
8 VAC
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61F
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8 VAC
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