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Basic Information
Solve issues related to machine safety and other safety measures with a safety door switch with key!
UL/C-UL,CE,TUV,UKCA Approved
The safety door switch with key SG-B2 series locks and unlocks doors with keys.
When an operator takes a key into a hazardous area, the safety door switch will not lock, and the equipment will stop, ensuring operator safety by preventing personnel from being closed inside the hazardous area and preventing equipment from starting to operate.
Safety worker
Hazards of the system and robot are isolated by the safety guard. The worker uses the key to unlock the door and disables the system from starting unexpectedly, then removes the key and brings it into the hazardous area. The system remains off until the worker walks out the door and locks the door with the key. This enables the worker carrying the key to work safely in the hazardous area.
Energy-saving design, no power supply required
Since doors are locked and unlocked with a key, there is no need to supply power to the safety door switch.
Head removal detection function
Head removal detection function is employed in the SG-B2. With this innovative function, the monitor circuit (41-42) turns off when the head is removed from the switch, such as when removing the head to change the head direction.
With the head installed on the switch, monitor circuits 41-42 and 51-52 operate in synchronization while the key locks / unlocks the actuator.
When the head is removed, 41-42 turns off and 51-52 turns on.
This disagreement is detected by the head removal detection function.
Note: Head removal detection function is not direct opening.
High-security pin tumbler key types are used
Available with rear unlocking button
Models with a rear unlocking button allow the door to be unlocked from the inside in the event a worker is left in the hazardous area.
All models come with cables pre-installed.
Double-insulated design eliminates the need for grounding wires.
Equipment combination examples related to machine safety
Safety controllers incorporate safety circuit logic that complies with ISO 13849-1 PLe requirements, making it easy to build safety circuits that support a variety of equipment without the need to create programs.
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Order guide
Safety door switch with key
Actuators are not included with door switches and must be purchased separately.
| Rear unlocking button | Contact arrangement (Note) | Cable length | Key removal position | Model No. |
|---|---|---|---|---|
| Without |
| 5m 16.404 ft | A (removable in all positions) | SG-B2-K2AC-5 |
| B (removable in UNLOCK position) | SG-B2-K2BC-5 | |||
| C (removable in LOCK position) | SG-B2-K2CC-5 | |||
| 5m 16.404 ft | A (removable in all positions) | SG-B2-K2AD-5 | |
| B (removable in UNLOCK position) | SG-B2-K2BD-5 | |||
| C (removable in LOCK position) | SG-B2-K2CD-5 | |||
| With |
| 5m 16.404 ft | A (removable in all positions) | SG-B2-K2AD-L5 |
| B (removable in UNLOCK position) | SG-B2-K2BD-L5 | |||
| C (removable in LOCK position) | SG-B2-K2CD-L5 |
Note: The contact configuration shows the status when the actuator is inserted and the switch is locked.
Key LOCK and UNLOCK positions are as shown on the right.
Actuators
Actuators are not included with door switches and must be purchased separately.
| Type | Description | Model No. |
|---|---|---|
| Straight actuator | The actuator tensile strength when using this product is 1,400 N. | SG-K21 |
| Straight actuator with rubber bushings | SG-K21A | |
| Slide actuator | SG-K21S | |
| Right-angle actuator | SG-K22 | |
| Right-angle actuator with rubber bushings | SG-K22A | |
| Horizontal / vertical angle adjustable actuators | The actuator tensile strength when using this product is 500 N. | SG-K24 |
Note: When using a safety door switch with key on a hinged door, see page 27 for more information about the minimum door radius with which the switch can be used.
SG-K21
SG-K21A
SG-K21S
SG-K22
SG-K22A
SG-K24
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Option
| Type | Model No. |
|---|---|
| Padlock hasp (Note 1) | SG-PH2 |
| Mounting plate (for mounting on an aluminum frame) | MS-SG-21 |
| Rear unlocking button kit for a frame (Note 2) | MS-SG-22 |
| MS-SG-23 |
Notes:
1) The shackle diameter for compliant padlocks ranges from ø5.5 to ø7.5 mm ø0.217 to ø0.295 in.
2) For more information about selecting a back manual unlock button kit for a frame, see the following table:
| Model No. | Mounting part* thickness (X) (mm in) |
|---|---|
| Rear unlocking button type When installing an SG-B2-K2□D-L5 with a rear unlocking button directly | |
| MS-SG-22 | 33 < X ≤ 43 1.299 < X ≤1.693 |
| MS-SG-23 | 23 < X ≤ 33 0.906 < X ≤ 1.299 |
* The mounting part is a frame or a panel that the product is mounted on.
Padlock hasp
SG-PH2
Mounting plate (for mounting on an aluminum frame)
MS-SG-21
Rear unlocking button kit for a frame
MS-SG-22
MS-SG-23
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Dimensions
- Unit: mm in
SG-B2-K2□-5
Door switch
When using horizontal mounting / straight actuator (SG-K21)
When using vertical mounting / straight actuator (SG-K22)
Notes:
1) Plug the unused actuator entry slot using the plug supplied with the switch.
2) When mounting the safety switch, be sure to conform to the mounting hole dimensions and secure in place with four screws.
SG-B2-K2□-L5
Door switch (rear unlocking button type)
When using horizontal mounting / straight actuator (SG-K21)
・Mounting part* thickness(X)：1 to 6mm 0.039 to 0.236 in
6 < X < 23 mm 0.236 < X < 0.906 in: Not mountable
23 ≤ X ≤ 43 mm 0.906 ≤ X ≤ 2.087 in: Use a rear unlocking button kit.
* The mounting part is a frame or a panel that the product is mounted on.
・With the mounting hole dimension, the rear unlocking button rod does not touch the hole even when the safety switch moves sideways.
Note: Plug the unused actuator entry slot using the plug supplied with the switch.
Actuator mounting reference position
As shown in the figure on the right, the mounting reference position of the actuator when inserted in the safety switch is:
The actuator stop on the actuator lightly touches the safety switch.
* The actuator stop is used to adjust the actuator position. Remove the actuator stop after the actuator position is mounted.
SG-K21
Straight actuator
Note: The actuator stop is used to adjust the actuator position. Remove the actuator stop after the actuator position is mounted.
SG-K22
Right-angle actuator (SG-K22)
Note: The actuator stop is used to adjust the actuator position. Remove the actuator stop after the actuator position is mounted.
SG-K21A
Straight actuator with rubber bushings
Note:The actuator stop is used to adjust the actuator position. Remove the actuator stop after the actuator position is mounted.
* Mounting pitch is set to 12 mm 0.472 in in factory. When setting the mounting pitch to 20 mm 0.787 in, widen the pitch of rubber cushions to 20 mm 0.787 in.
* The actuator has movement flexibility to the directions shown in (B).
SG-K22A
Right-angle actuator with rubber bushings
Note:The actuator stop is used to adjust the actuator position. Remove the actuator stop after the actuator position is mounted.
* When the mounting pitch is 12 mm 0.472 in (factory setting), the actuator has movement flexibility to the directions shown in (A) and (B).
* When the mounting pitch is 20 mm 0.787 in, the actuator has movement flexibility to the directions shown in (B). Side the rubber cushions together with the screws.
SG-K21S
Slide actuator
SG-K24
Horizontal / Vertical angle adjustable actuators
Note: The actuator stop is used to adjust the actuator position. Remove the actuator stop after the actuator position is mounted.
Changes in the orientation of adjustment for angle adjustable (vertical / horizontal) actuators
The orientation of adjustment of angle adjustable (vertical / horizontal) actuators is determined by the position in which the orienting insert (white plastic) is installed on the back of the actuator.
Install the insert according to the desired orientation of adjustment.
Exercise care not to lose the orienting insert. The actuator will not operate properly without the orienting insert.
SG-PH2
Padlock hasp (Optional)
MS-SG-21
Mounting plate (Optional)
Material: Anodized aluminum A6063
Weight: Approx. 180 g
Note: With the mounting hole dimension, the rear unlocking button rod does not touch the hole even when the safety switch moves sideways.
MS-SG-22
MS-SG-23
Rear unlocking button kit for a frame (Optional)
Note: With the mounting hole dimension, the rear unlocking button rod does not touch the hole even when the safety switch moves sideways.
Rear unlocking button mounting dimensions
Example: When mounted on a □30 mm □1.181 in frame using the mounting plate above MS-SG-21, select MS-SG-22 since the mounting part thickness (X) is 40 (X = 10 + 30 = 40) 1.575 (X = 0.394 + 1.181 = 1.575).
For more information about selecting a back manual unlocking button kit for a frame, see the following table:
| Model No. | Mounting part* thickness (X) (mm in) |
|---|---|
| Rear unlocking button type When installing an SG-B2-K2□D-L5 with a rear unlocking button directly | |
| MS-SG-22 | 33 < X ≤ 43 1.299 < X ≤ 1.693 |
| MS-SG-23 | 23 < X ≤ 33 0.906 < X ≤ 1.299 |
* The mounting part is a frame or a panel that the product is mounted on.
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- Regardless of door types, do not use the safety switch as a door stop. Install a mechanical door stop at the end of the door to protect the safety switch against excessive force.
- Do not apply excessive shock to the safety switch when opening or closing the door. A shock to the safety switch exceeding 1,000 m/s2 may cause damage to the safety switch.
- If the operating atmosphere is contaminated, use a protective cover to prevent the entry of foreign objects into the safety switch through the actuator entry slots. Entry of a considerable amount of foreign objects into the safety switch may affect the mechanism of the safety switch and cause a malfunction.
- Cover the unused actuator entry slot using the slot plug supplied with the safety switch.
- Do not store the safety switches in a dusty, humid, or organic-gas atmosphere, or in an area subjected to direct sunlight.
- Use proprietary actuators only. When other actuators are used, the safety switch may be damaged.
Do not cut, machine, or otherwise modify actuators. Doing so may cause equipment failure. - Do not open the lid of the safety switch. Loosening the screws may damage the safety switch.
- The locking strength is rated at 1,400 N. Do not apply a load higher than the rated value. When a higher load is expected, provide an additional system consisting of another safety switch without lock or a sensor to detect door opening and stop the machine.
- Regardless of door types, do not use the safety switch as a door lock. Install a separate lock using a latch or other measures.
- Although the SG-K21A / SG-K22A actuators alleviate the shock when the actuator enters the slot on the safety switch, make sure that excessive shock is not applied. If the rubber bushings become deformed or cracked, replace with new ones.
- Do not mount the safety switch facing down as shown in the figure below. Otherwise, the key may fall off due to shock.
Cables
- Do not fasten or loosen the gland at the bottom of the safety switch.
- When bending the cable during wiring, make sure that the cable radius is kept at 30 mm 1.181 in minimum.
- When wiring, make sure that water or oil does not enter the cable.
- Do not open the lid of the safety switch. Otherwise the safety switch will be damaged.
Minimum radius of hinged door
When using the safety switch on hinged doors, refer to the minimum radius of doors shown below. When using on doors with small minimum radius, use the angle adjustable actuator (SG-K24).
Note: Because deviation or dislocation of hinged doors may occur in actual applications, make sure of the correct operation before installation.
When using the right-angle actuator (SG-K22)
<When the door hinge is on the extension line of the actuator mounting surface>
<When the door hinge is on the extension line of the safety switch surface>
When using the right-angle actuator (with rubber bushings) (SG-K22A)
<When the door hinge is on the extension line of the actuator mounting surface>
<When the door hinge is on the extension line of the safety switch surface>
Actuator angle adjustment (vertical / horizontal)
- Using the angle adjustment screw (M3 hexagon-socket-head screw), the actuator angle can be adjusted. (refer to the dimensions)
Adjustable angle: 0 to 20° - The larger the adjusted angle of the actuator, the smaller the applicable radius of the door opening. After installing the actuator, open the door. Then adjust the actuator so that its edge can be inserted properly into the actuator entry slot of the safety switch.
- After adjusting the actuator angle, apply Loctite to the adjustment screw so that the screw will not move.
When using the angle adjustable actuator (SG-K24)
- When the door hinge is on the extension line of the actuator mounting surface: 70 mm 2.756 in
- When the door hinge is on the extension line of the safety switch surface: 50 mm 1.969 in
<When the door hinge is on the extension line of the actuator mounting surface>
<When the door hinge is on the extension line of the safety switch surface>
Mounting
- Mount the safety switch on a fixed piece of machinery or guard and the actuator on a hinged door.
Avoid mounting both the safety switch and actuator on a hinged door. Doing so may cause equipment failure. For more information about how to mount the devices, see the following diagram:
Recommended tightening torque for mounting screws
・Recommended screw tightening torque
| Screw tightening torque | |
|---|---|
| For mounting the safety switch (M4 screw) (Note 1) | 1.8～2.2N・m |
| For mounting the actuator (SG-K21 : Two M4 screws) (Note 1) (SG-K21A / SG-K22A : Two M4 screws) (Note 1, 2) (SG-K21S : M5 screw) (Note 1) (SG-K22 : Two M4 phillips screws) (SG-K24 : Two M4 screws) (Note 1) | 1.8～2.2N・m 1.0～1.5N・m 4.5～5.5N・m 0.8～1.2N・m 1.0～1.5N・m |
| For mounting the SG-B2 head (M3) | 0.9～1.1N・m |
| For mounting the manual rear unlocking button (M3 screw with washers) | 0.5～0.7N・m |
Notes:
1) The above recommended tightening torques of the mounting screws are the values confirmed with hexagon-socket-head bolts. When other screws are used and tightened to a smaller torque, make sure that the screws do not come loose after mounting.
2) In the case of SG-K21A or SG-K22A, using two M4 screws and two attached washers, fasten the actuator securely on the door.