JSTD1 SAFEBALL™ Two Hand Device
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Technical Data
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Manufacturer........... JOKAB SAFETY AB, Sweden
Ordering Data........................... JSTD1-A, -B, -C, -E
Color................................................ black and yellow
Weight.................................... 0.2 kg with 2 m cable
0.7 kg with 10 m cable
0.1 kg with 4x0.25 m wires
Size
Height..................................... approximately 71 mm
Diameter..... minimum 68 mm, maximum 72 mm
Base................................................................. 42 mm
Temperature................... 0ºC to +55ºC (operating)
-20ºC to +70ºC (storing)
Protection Class................................................ IP67
(not intended for use below water surface)
Operating Force..................................... approx. 2 N
Actuator Travel................................ 1.3 +/- 0.5 mm
Max. Switching Load.......................... 30 V/2A DC,
resistive load
Recommended Load.................... 24 V/10mA DC,
resistive load
Min. Switching Load....................... 6 V/10mA DC,
resistive load
Contact Material................... gold clad silver alloy
Contact Resistance.............................. 100 mOhm
Mechanical Life... >1x106 operations at max 1 Hz
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Chemical Resistance
at 20ºC |
| Chemical |
Resistance |
| Alcohols |
Good |
| Paraffin Oil |
Good |
| Milk |
Good |
| Silicon Oil |
Good |
| Acetone |
Good |
Electrical Life.............. dependant upon electrical
load characteristics
Connection Cable
JSTD1, JSTD1-A............................. 2m PVC-cable,
4 x 0.75mm2
JSTD1-B, JSTD1-E................. 4 x 0.75mm2 wires,
approx. 0.25m
JSTD1-C..................10m PVC-cable, 4 x 0.75mm2
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Function - JSTD1 SAFEBALLTM
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Two-Hand Control Device
The Two hand control device is made by using two SafeballsTM, each having two internal pushbuttons. The SafeballsTM must be mounted a minimum distance between each other (See Mounting description).
By utilizing two push-buttons in each device a double safety function is provided in each hand.
The highest safety level is achieved by connecting all four push-buttons to the JOKAB SAFETY JSBR4 safety relay. The safety relay gives a dual and supervised safety function and requires input activation within 0.5 seconds in order to start the machine. It also checks that all four pushbuttons have returned to their deactivated positions before a new start is allowed. The JSBR4 safety relay also provides a stop signal if one or more push-buttons are released.
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One-Hand Control Device
SafeballTM is also a very practical method of providing a one hand control device as it is very easy to find and activate by the machine operator. One hand devices should only be used when the operator cannot reach into the hazardous area with his/her free hand or on less dangerous machines. Before installation necessary risk assessment must be made to determine suitability of this type of control. To achieve the highest safety level for One hand control the SafeballTM must be connected to the JOKAB SAFETY RT6 safety relay.
Versions
SafeballTM is available in several versions to meet different environmental conditions and mounting methods.
JSTD1-A The standard version with actuators made of plastic and 2 m cable.
JSTD1-B Made as standard version but without cable. Instead it has four wires each 0.25m long.
JSTD1-C Same as JSTD1-A but with 10 m cable.
JSTD1-E Same as JSTD1-B but with 2 NO contacts.
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Activation of a pushbutton.
A top cover is not needed as activation switches are fitted on each side of the SafeballTM.
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