EL SERIES
SHOCK RELAYS THE ELECTRONIC SHEAR PIN
LOCKING ELEMENT STYLE Features & Applications External Lock Excellent for hollow shaft or space restricted installation. Easy to Install and Remove Installs or removes just by the tightening or loosening of bolts. No need to hassle with adjusting keyways and thermal fittings.
Pioneered by Tsubaki, the Shock Relay protects your equipment against unexpected shock loads, overloads, and underloads before damage occurs. The Shock Relay protects the mechanical parts of your equipment by monitoring the current draw on your electric drive motor, and shutting it down when the motor works too hard for too long. Advantages: • Back to work with the press of a button
• No moving parts, CPU design ensures repeatability • Precise set-points retain accuracy day-after-day • Permits problem notification by alarm or warning lights • Protect equipment that is up to 1000 feet away
MODEL NUMBER PL
Reacts only when there is a problem At installation, two set-points are made to the Shock Relay: • How hard is the equipment allowed to work as measured by motor amperage • Once the motor starts to work too hard, how soon in seconds must we stop production
The Shock Relay adapts to virtually any kind of equipment that’s driven by an electric motor and is used in applications in a broad variety of industries. Some of the common industries and applications are listed below:
010 X 013
E
EL Series
Outer Dia. (mm)
Industry
Application
Shaft Dia. (mm)
POWER-LOCK ®
Material handling
Conveyors, turntables, elevators Pumps, scrapers, water screens
Water treatment plants
INNER RING
OUTER RING
Balancing these two settings allows for protection when the unexpected happens, limiting damage and downtime.
Food machinery
Screw and belt conveyors, bucket elevators
Machine tool
Tapping machines, drill presses
Chemical
Pumps, agitators, filters
EF METRIC SERIES
THIN PROFILE SERIES Features & Applications Same Inner and Outer Diameters as the EL Series Designed with the same inner and outer diameters as an EL Series POWER-LOCK ® Self-Centering These units provide accurate shaft-hub alignment and concentricity, allowing straight bore mounting. Simple Construction Constructed with only an inner and an outer ring and locking bolts. Simply tighten the bolts to achieve a completely secure connection.
THEORY OF OPERATION
HOW DOES IT WORK?
Shock time: The Shock Relay does not respond to excess current if it does not exceed the preset shock time.
Shock time: When excess current goes beyond the preset time the Shock Relay responds.
Start time: Within a set time, the Shock Relay does not respond to motor starting current.
Shock Relay operation (trip)
Motor rotation speed
Rotation speed /current
Set current value
Motor load current
Short period of current surge
Overload
MODEL NUMBER PL
LOCKING BOLTS
INNER RING
OUTER RING
018 X 022
EF
Set start time value
Set shock time value Set shock time value
Time
EF Series
Start-up
Steady area
Overload area Stoppage
Outer Dia. (mm)
Shaft Dia. (mm)
POWER-LOCK ®
241
242
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