Time Mark 108C Data Sheet

1.2"

4.0"

2.25"

18" leads

A B

C

Model 108C

MODEL 108C

TIME MARK is a division of

Motor Rotation

Indicator

 Saves Time - Eliminates Guesswork

 No Need to Disconnect

Driven Unit Shaft Couplings

 No External Power Required

 Latching Circuit

DESCRIPTION

Rotating an electric motor shaft in the wrong direction
can cause severe mechanical damage to expensive
machinery. The Model 108C Motor Rotation Indicator
can quickly show shaft rotation direction, thus becoming
a valuable addition to your shop equipment.

Designed for the installation of conveyer lines, pump
systems, and interconnected drives, the Model 108C
requires only a few seconds to determine the proper
connections to be made. The three leads are color
coded: Red=phase A, Black=phase B, and White=
phase C. This small device will allow you to connect all
motors to run in the proper direction.

SPECIFICATIONS

MODEL 108C

Power Source 9 volt battery (included)

Leads 18” color-coded

Lead Termination Alligator clips

Weight 8 oz. max.

Enclosure Material ABS plastic

DIMENSIONS

TYPICAL APPLICATION

11/2011

© 2011 TIME MARK CORPORATION

MODEL 108C

TIME MARK is a division of

Motor Rotation Indicator

READ ALL INSTRUCTIONS BEFORE INSTALLING, OPERATING OR SERVICING THIS DEVICE.

KEEP THIS DATA SHEET FOR FUTURE REFERENCE.

GENERAL SAFETY

DO NOT CONNECT THE LEAD WIRES OF THE MODEL 108C TO ANY MOTOR OR

OTHER ELECTRICAL SOURCE TO WHICH POWER IS APPLIED.

Model 108C contains its own low voltage power source

and can be severely damaged if external power is applied.

OPERATOR INSTRUCTIONS

OPERATION

Disconnect the motor from the power line. Connect
the three leads on the Model 108C to the three motor
leads.

Press the CHARGE button, marked FIRST. Hold for at
least 5 seconds, then release. Press the READ button,
marked SECOND. Hold for at least 5 seconds then,
while continuing to hold down the SECOND button, spin
the motor shaft briskly 1/4 turn. Either the A-B-C or C-B

-A lamp will light, indicating the motor connection
sequence.

Release the SECOND pushbutton.

If the A-B-C light illuminated, disconnect the Model
108C and connect the A-B-C leads of the 3-phase
power* to the motor leads identified as A-B-C by the
Model 108C Indicator. When powered, the motor will
spin in that direction.

If the C-B-A light illuminated, reverse the A and C leads

and repeat the operation, beginning with “Press the
CHARGE button”, in the second paragraph above.

*NOTE: If you are not sure of the 3-phase sequence,
use a Time Mark Phase Sequence Detector (Models
108A, 108B or 125C) to verify line sequence.

WARRANTY

This product is warranted to be free from defects in
materials and workmanship, and is covered by our
exclusive 5-year Unconditional Warranty. Should this
device fail to operate for any reason, we will repair it for
five years from the date of manufacture. For complete
warranty details, see the Terms and Conditions of Sales
page in the front section of the Time Mark catalog or
contact Time Mark at 1-800-862-2875.

11/2011

© 2011 TIME MARK CORPORATION