TSB50D, TSB152D Overload Protection for D.C. Motors
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.
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 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. START TIME When starting a motor, the starting current value is greater than the running current. This starting cur- rent 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. CURRENT FLOW INDICATOR This lamp lights when the load current flows into the SHOCK RELAY. This is after the fixed 3-second start time.
SHOCK TIME This presets the overload period. Range is variable from 0.2 to 3 seconds. Every momentary load over the preset current with a shorter period than the preset is ignored. When the overload equals the preset period, the SHOCK RELAY will trip immediately to break the power supply to the motor.
LOAD CURRENT ADJUSTMENT Adjustable range is from 50% to 130%.
SHOCK TIME Adjustable range is from 0.3 to 3 seconds.
SHUNT SELECTION
The D.C. Motor Shock Relay has basically the same functions and dimensions as the standard TSB152 and TSB50. Differences exist in that a shunt is required to monitor direct current of the D.C. motor in place of using a current transformer.
Note: TSB50D automatically resets when the motor power is disconnected. If manual reset is required, it is possible by installing a sepa- rate reset button.
TYPICAL CONNECTING DIAGRAM
TSB152D SHOWN
When ordering the TSB152D or TSB50D, select the correct shunt from the chart. The shunt selected should closely match the motor’s armature amperage. U.S. Tsubaki will include the shunt you select with the Shock Relay.
CATALOG NUMBER AMP A B
Shunt 1-50 Shunt 2-50 Shunt 5-50 Shunt 10-50 Shunt 20-50 Shunt 50-50 Shunt 100-50 Shunt 150-50 Shunt 200-50 Shunt 250-50 Shunt 300-50 Shunt 400-50 Shunt 500-50
1 2 5
1.38 1.38 1.38 1.38 1.38 1.38 1.38 1.38 1.38 1.63 1.63 1.63 1.63
.500 .500 .500 .500 .500 .500 .500 .500 .500 .750 .750 .750 .750
10 20 50
100 150 200 250 300 400 500
M Motor MC Electromagnetic Contactor TH Thermal Overload Relay CB Circuit Breaker
Note: Refer to Specifications on page D-16.
D-14
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