Precautions For All Relays - Omron G9SA Series Manual

Precautions for All Relays

Refer to the Safety Precautions section for each Relay for specific precautions applicable to that Relay.
■ Precautions for Safe Use
These precautions are required to ensure safe operation.
• Do not touch the charged Relay terminal area or the charged
socket terminal area while the power is turned ON. Doing so may
result in electric shock.
• Do not use a Relay for a load that exceeds the Relay's switching
capacity or other contact ratings. Doing so will reduce the specified
performance, causing insulation failure, contact welding, and
contact failure, and the Relay itself may be damaged or burnt.
• Do not drop or disassemble Relays. Doing so may reduce Relay
characteristics and may result in damage, electric shock, or
burning.
• Relay durability depends greatly on the switching conditions.
Confirm operation under the actual conditions in which the Relay
will be used. Make sure the number of switching operations is
within the permissible range. If a Relay is used after performance
has deteriorated, it may result in insulation failure between circuits
and burning of the Relay itself.
■ Precautions for Correct Use
Contents
No. Area No. Classification No.
A
Using Relays
B A
Selecting Mounting
Relays Structure and
Type of
Protection
B
Drive Circuits
C
Loads
C A
Circuit Load Circuits
Design
B
Input Circuits
C
Mounting
Design
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1 Type of Protection
2 Combining Relays and Sockets
3 Using Relays in Atmospheres Subject to Dust
1 Providing Power Continuously for Long Periods
2 Operation Checks for Inspection and Maintenance
1 Contact Ratings
2 Using Relays with a Microload
1 Load Switching
A Resistive Loads and Inductive Loads
B Switching Voltage
C Switching Current
2 Electrical Durability
3 Failure Rates
4 Contact Protection Circuits
5 Countermeasures for Surge from External Circuits
Connecting Loads for Multi-pole Relays
6
7 Motor Forward/Reverse Switching
8 Power Supply Double Break with Multi-pole Relays
9 Short-circuiting Due to Arcing between NO and NC Contacts in SPDT Relays
10 Using SPST-NO/SPST-NC Contact Relays as an SPDT Relay
11 Connecting Loads of Differing Capacities
1 Maximum Allowable Voltage
2 Voltage Applied to Coils
3 Changes in Must-operate Voltage Due to Coil Temperature
4 Applied Voltage Waveform for Input Voltage
5 Preventing Surges when the Coil Is Turned OFF
6 Leakage Current to Relay Coils
Using with Infrequent Switching
7
8 Configuring Sequence Circuits
9 Connecting Relay Grounds
10 Individual Specifications for Must-operate/release Voltages and Operate/Release Times
11 Using DC-operated Relays, (1) Input Power Supply Ripple
12 Using DC-operated Relays, (2) Coil Polarity
13 Using DC-operated Relays, (3) Coil Voltage Insufficiency
1 Lead Wire Diameters
2 When Sockets are Used
3 Mounting Direction
4 When Devices Such as Microcomputers are in Proximity
• Do not apply overvoltages or incorrect voltages to coils, or
incorrectly wire the terminals. Doing so may prevent the Relay from
functioning properly, may affect external circuits connected to the
Relay, and may cause the Relay itself to be damaged or burnt.
• Do not use Relays where flammable gases or explosive gases may
be present. Doing so may cause combustion or explosion due to
Relay heating or arcing during switching.
• Perform wiring and soldering operations correctly and according to
the instructions contained in Precautions for Correct Use given
below. If a Relay is used with faulty wiring or soldering, it may
cause burning due to abnormal heating when the power is turned
ON.
Item
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