OMRON G7S User Manual

Relays with Forcibly Guided Contacts

G7S

Relays Conforming to EN Standard

• Relays with forcibly guided contacts (EN50205 Class A, certified by VDE).

• Supports the CE marking of machinery (Machinery Directive).

• Helps avoid hazardous machine status when used as part of an interlocking circuit.

• Track-mounting and Back-mounting Sockets are available.

Note: Be sure to refer to the “Safety Precautions” on page 5.

Model Number Structure

■ Model Number Legend

G7S-@A@B

1 2

1. NO Contact Poles

4: 4PST-NO 3: 3PST-NO

2. NC Contact Poles

2: DPST-NC 3: 3PST-NC

Ordering Information

Relays with Forcibly Guided Contacts

Type Poles Contact configuration Rated voltage Model

Standard 6 poles 4PST-NO, DPST-NC 24 VDC G7S-4A2B

3PST-NO, 3PST-NC G7S-3A3B

■ Accessories

Sockets

Type Rated voltage Model

Track-mounting Common for track mounting and screw mounting 24 VDC P7S-14F-END Back-mounting PCB terminals --- P7S-14P-E

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Specifications

■ Ratings

Coil

G7S

Rated voltage Rated current Coil resistance Must operate

24 VDC 30 mA 800 : 80% max. (V) 10% min. (V) 110% (V) Approx. 0.8 W

Note: 1. The rated current and coil resistance are measured at a coil temperature of 23qC with tolerances of r15%.

2. Performance characteristics are based on a coil temperature of 23qC

3. The maximum voltage is based on an ambient operating temperature of 23qC maximum.

voltage

Must release

voltage

Max. voltage Power consumption

Contacts

Load Resistive load Inductive load (cos I = 0.4, L/R = 7 ms)

Rated load 240 VAC: 3 A, 24 VDC: 3 A 240 VAC: 3 A, 24 VDC: 1 A Rated carry current 6 A Maximum switching voltage 250 VAC, 24 VDC Maximum switching current 6 A

■ Characteristics

Sockets

Model Continuous current Dielectric strength Insulation resistance

P7S-14@ 10 A 2,000 VAC for 1 min. between terminals 1,000 M: min. (See note 2.)

Note: 1. Use the P7S-14F-END in the ambient humidity range of 35 to 85%.

2. The insulation resistance was measured with a 500-VDC megohmmeter at the same locations as the dielectric strength was measured.

Relays with Forcibly Guided Contacts

Contact resistance (See note 2.) 100 m: max. Operating time (See note 3.) 50 ms max. Release time (See note 3.) 50 ms max.

Maximum operating frequency

Insulation resistance (See note 4.) 100 M: min. (at 500 VDC) Dielectric strength 2,500 VAC, 50/60 Hz for 1 min. (1,500 VAC between contacts of same polarity) Vibration resistance Destruction 10 to 55 Hz, 0.75-mm single amplitude (1.5-mm double amplitude)

Shock resistance Destruction

Durability (See note 5.)

Failure rate (P level) (reference value) (See note 6.)

Ambient operating temperature –25 to 70qC (with no icing or condensation) Ambient operating humidity 5% to 85% Weight Approx. 65 g

Note: 1. The above values are initial values.

2. Measurement conditions: 5 VDC, 10 mA, voltage drops.

3. Measurement conditions:

Rated voltage operation Ambient operating temperature: 23qC Contact bounce time is not included.

4. The insulation resistance was measured with a 500-VDC

megohmmeter at the same locations as the dielectric strength was measured.

Mechanical 18,000 operations/h Rated load 1,800 operations/h

Malfunction 10 to 55 Hz, 0.375-mm single amplitude (0.75-mm double amplitude)

1,000 m/s

Malfunction

Mechanical 10,000,000 operations min. (at approx. 18,000 operations/h) Electrical 100,000 operations min. (at the rated load and approx. 1,800 operations/h)

100 m/s

5 VDC, 1 mA

5. The durability is for an ambient temperature of 15 to 35qC and an ambient humidity of 25% to 75%.

6. The failure rate is based on an operating frequency of 60 operations/min.

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G7S

■ Certified Standards

• EN Standards, VDE Certified

EN61810-1 (Electromechanical non-specified time all-or-nothing relays) EN50205 (Relays with forcibly guided (linked) contacts)

• UL standard UL508 Industrial Control Devices

• CSA standard CSA C22.2 No. 14 Industrial Control Devices

Technical Data

Durability Curve (Rated Resistive Load)

operations)

No. of operations (x10

AC or DC resistive load

234 5 67

Contact current (A)

■ Forcibly Guided Contacts (from EN50205)

If an NO contact becomes welded, all NC contacts will maintain a minimum distance of 0.5 mm when the coil is not energized. Likewise if an NC contact becomes welded, all NO contacts will maintain a minimum distance of 0.5 mm when the coil is energized.

Dimensions

Note: All units are in millimeters unless otherwise indicated.

■ Relays with Forcibly Guided Contacts

G7S-4A2B G7S-3A3B

62 max.

22.5 max.

24 VDC

37 max.

5 min.

24 VDC

Terminal Arrangement/Internal Connection Diagram (Bottom View) G7S-4A2B

Mounting Hole Dimensions

G7S-3A3B

Fourteen,

1.8 dia.

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■ Sockets

G7S

P7S-14F-END Track-mounting Socket

Indicator

40 max.

33±0.1

(5)

P7S-14P-E Back-mounting Socket (PCB Terminals)

70.5 max.

±0.2

23.5 max.

Two, 6.5 dia x 8 depth

7.5

90.5 max.

Fourteen, M3.0×8

3.1

13.2

57 max.

Terminal Arrangement/Internal Connection Diagram (Top View)

Mounting Hole Dimensions

80 max.

5.9

Terminal Arrangement/Internal Connection Diagram (Bottom View) With G7S-4A2B mounted

With G7S-3A3B mounted

14.5

Fourteen, 2.5 dia.

33±

0.1

520

Two, M3.5- or

4.0-dia. holes

Mounting Hole Dimensions

±0.2

2.8

5×7=35

(21)

4.2

(16.9)

Tw o,

3.6 dia.

5×7=35

16.9

(15)

23.5 max.

14.5

4.1

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Safety Precautions

Refer to the “Precautions for All Relays” and “Precautions for All Relays with Forcibly Guided Contacts”.

■ Precautions for Correct Use

Wiring

• Use one of the following wires to connect to the P7S-14F-END.

Stranded wire: 0.75 to 1.5 mm Solid wire: 1.0 to 1.5 mm

• Tighten each screw of the P7S-14F-END to a torque of approximately 0.98 N·m.

• Refer to the internal connections diagram of the G9S Safety Relay Unit for an application example of the G7S.

• Wire the terminals correctly with no mistakes in coil polarity, otherwise the G7S will not operate.

Cleaning

The G7S is not of enclosed construction. Therefore, do not wash the G7S with water or detergent.

G7S

Cat. No. J107-E1-05

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ALL DIMENSIONS SHOWN ARE IN MILLIMETERS.

To convert millimeters into inches, multiply by 0.03937. To convert grams into ounces, multiply by 0.03527.

In the interest of product improvement, specifications are subject to change without notice.

Precautions for All Relays with Forcibly Guided Contacts

Note: Refer to the Safety Precautions section for each Switch for specific precautions applicable to each Switch.

■ Precautions for Safe Use

Mounting

The Relays with Forcibly Guided Contacts can be mounted in any direction.

Relays with Forcibly Guided Contacts

While the Relay with Forcibly Guided Contacts has the previously described forcibly guided contact structure, it is basically the same as an ordinary relay in other respects. Rather than serving to prevent malfunctions, the forcibly guided contact structure enables another circuit to detect the condition following a contact weld or other malfunction. Accordingly, when a contact weld occurs in a Relay with Forcibly Guided Contacts, depending on the circuit configuration, the power may not be interrupted, leaving the Relay in a potentially dangerous condition (as shown in Fig. 1.) To configure the power control circuit to interrupt the power when a contact weld or other malfunction occurs, and to prevent restarting until the problem has been eliminated, add another Relay with Forcibly Guided Contacts or similar Relay in combination to provide redundancy and a self-monitoring function to the circuit (as shown in Fig. 2). Refer to the Technical Guide section.

The G9S/G9SA/G9SB Safety Relay Unit, which combines Relays such as the Relay with Forcibly Guided Contacts in order to provide the above-described functions, is available for this purpose. By connecting a contactor with appropriate input and output to the Safety Relay Unit, the circuit can be equipped with redundancy and a self-monitoring function.

CE Marking

(Source: Guidelines on the Application of Council Directive 73/23/ EEC)

The G7SA, G7S and G7S-@-E have been recognized by the VDE for meeting the Low Voltage Directive according to EN requirements for relays and relays with forcibly guided contacts. The Low Voltage Directive, however, contains no clauses that specify handling methods for components, and interpretations vary among test sites and manufacturers. To solve this problem, the European Commission has created guidelines for the application of the Low Voltage Directive in EU. These guidelines present concepts for applying the Low Voltage Directive to components. The G7SA, G7S and G7S-@- E, however, do not display the CE Marking according to the concepts in the guidelines.

VDE recognition, however, has been obtained, so there should be no problems in obtaining the CE Marking for machines that use the G7SA, G7S or G7S-@-E. Use the manufacturer’s compliance declaration to prove standard conformance.

Contents of the Guidelines

The Guidelines on the Application of Council Directive 73/23/EEC apply to components. Relays with PWB terminals are not covered by the Low Voltage Directive.

Fig 1 Fig 2

Power source

+ −

T11

T12

K3 K1

T21 T22

Y1 X1 13B1

K1 K1

K3 K2

K2 K2

Power source

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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. Item Page

A Using Relays

Type of Protection

B Selecting

Rela

C Circuit

Design

A Mounting

tructure and

S Type of Protection

B Drive Circuits 12Providing Power Continuously for Long Periods

C Loads 12Contact Ratings

A Load Circuits 1

B Input Circuits 1

C Mounting

Design

Combining Relays and Sockets

Using Relays in Atmospheres Subject to Dust

Operation Checks for Inspection and Maintenance

Using Relays with a Microload Load Switching

A Resistive Loads and Inductive Loads B Switching Voltage C Switching Current

Electrical Durability

Failure Rates

Contact Protection Circuits

Countermeasures for Surge from External Circuits

Connecting Loads for Multi-pole Relays

Motor Forward/Reverse Switching

Power Supply Double Break with Multi-pole Relays

Short-circuiting Due to Arcing between NO and NC Contacts in SPDT Relays

Using SPST-NO/SPST-NC Contact Relays as an SPDT Relay

Connecting Loads of Differing Capacities

Maximum Allowable Voltage Voltage Applied to Coils

Changes in Must-operate Voltage Due to Coil Temperature

Applied Voltage Waveform for Input Voltage

Preventing Surges when the Coil Is Turned OFF

Leakage Current to Relay Coils

Using with Infrequent Switching

Configuring Sequence Circuits

Connecting Relay Grounds

Individual Specifications for Must-operate/release Voltages and Operate/Release Times

Using DC-operated Relays, (1) Input Power Supply Ripple

Using DC-operated Relays, (2) Coil Polarity

Using DC-operated Relays, (3) Coil Voltage Insufficiency

Lead Wire Diameters

When Sockets are Used

Mounting Direction

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.

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