Grizzly T20551 Parts Breakdown, Thermal Relay Overload, On Button, Manual Trip Test Lever

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Thermal Relay Overload

Amp Adjustment Dial: Turn this dial to meet your motor manufacturer's thermal overload amp setting specification. Typically this setting is 100-110% of what is listed on the motor data plate as the max amp load. Remember, turning this dial has no effect on increasing motor horsepower. If this dial is turned to an amp setting that is too high, the motor can overheat and be damaged before the relay trips.

Manual Contactor Override Lug: When pushed, the contactor is manually closed for troubleshooting purposes only.

ON Button:

When pushed, power is sent to the magnetic field coil and the contactor closes and sends power to the motor.

Reset Button/OFF Button: Reset operation: If the thermal relay has tripped, push this button to reset the thermal relay.

OFF operation: If the motor is operating normally, this button will also cut the current going to the magnetic field coil, which opens the contactor and kills

Manual Trip Test Lever:

If the thermal relay function is in question, use a wooden stick

or dowel to slide the brown lever to the right. If the motor shuts off, the thermal relay has tripped and is functional. If the

motor keeps running, the thermal relay contacts are shorted closed and the relay must be replaced.

Parts Breakdown

power to the motor.

3

4

2-2

 

 

 

10

11

5

8

7

 

1

 

6

 

 

 

 

 

 

2

2-1

 

 

 

REF

PART #

DESCRIPTION

 

 

 

1

PT20550001

SWITCH BOX

2

PT20550002

SWITCH BOX COVER ASSEMBLY

2-1

PT20551002-1

DATA LABEL

2-2

PT20550002-2

PLASTIC COVER SCREW

3

PT20551003

CONTACTOR MA-30 220V

4

PT20550004

FIELD SWITCH

REF

PART #

DESCRIPTION

 

 

 

5

PT20551005

RELAY RA-30 22-34A

6

PT20550006

CONTACTOR RETAINER

7

PS38M

PHLP HD SCR M4-.7 X 10

8

PHTEK18

TAP SCREW #10 X 5/8

10

P4571010

LIQUID-TITE STRAIN RELIEF

11

P4571011

RUBBER SEAL

COPYRIGHT © JANUARY, 2008 BY GRIZZLY INDUSTRIAL, INC. WARNING: NO PORTION OF THIS MANUAL MAY BE

REPRODUCED IN ANY SHAPE OR FORM WITHOUT THE WRITTEN APPROVAL OF GRIZZLY INDUSTRIAL, INC.

#CR10390 PRINTED IN TAIWAN

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Contents Contactor Model T20551 Magnetic Switch Instruction SheetMagnetic Switch Assembly MA-30 220V Coil Thermal Overload RelayThermal Relay Overload Power to the motorParts Breakdown On Button