TSB151M, TSB152M Overload Protection Plus Impact Detection
ACTUAL LOAD METER Actual current of the motor is indicated in percentages, which makes it easy to set “LOAD CURRENT,” regardless of the value of the
POWER INDICATOR Indicates that the power supply is on. TRIP INDICATOR Lamp comes on when SHOCK RELAY trips. TEST BUTTON This switch is used to verify SHOCK RELAY operation. RESET BUTTON (manual) Reset can be done quickly whenever a cycle restart is desired. SHOCK TIME This presets the overload period. Range is vari- able from 0.2 to 3 seconds. Every momen- tary load over the preset current with a shorter period than the preset period is ignored. When the overload equals the preset period, the SHOCK RELAY will trip immediately to break the power supply to the motor.
actual current load. LOAD CURRENT
This presets the load current at the optimum setting in the range from 30% to 130% of the motor’s current. When the actual load current exceeds the preset current for the preset SHOCK TIME, the SHOCK RELAY trips to break the motor circuit. IMPACT SET POINT This presets the point at which an Impact Shock Load is deemed dangerous. When the actual load current exceeds this level for more than 5/100 of a second, the SHOCK RELAY trips to break the motor circuit.
START TIME When starting a motor, the starting current value is greater than the running current. This starting current value continues until the motor reaches normal speed. During this starting period, the time of which mainly depends on the type of load, the function of detecting the overload current is disabled. Adjustable range is from 0.2 to 20 seconds.
SPECIFICATIONS
For Impact Load
30% 300%
Load Current Setting Shock Time Setting
For Continuous Load For Impact Load For Continuous Load
30% 130%
.05 sec. (fixed)
.2 sec. 3 sec.
DIAGRAM OF OPERATION
TYPICAL CONNECTING DIAGRAM
TSB151M, TSB152M
M Motor MC Electromagnetic Contactor TH Thermal Overload Relay CB Circuit Breaker
Note: Refer to Specifications on page D-16.
Dimensions and current transformer selection are the same as for the TSB151 and TSB152. Refer to page D-8.
D-12
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