Time Mark 171 Data Sheet
MODEL 171
TIME MARK is a division of
1 AMP CURRENT
MONITOR
Monitors AC Current from 0.1 - 1A
Adjustable Drop-out Set Point
Adjustable Trip and Restart Delays
Monitors for Undercurrent Conditions
DESCRIPTION
The Model 171 is an AC current monitor for detecting
undercurrent conditions. The monitor contains a proprietary
microcontroller-based circuit monitoring current passed
through an internal shunt resistor and driving an
electromechanical SPDT relay. Two status lights are provided
to indicate relay status, fault condition, and timing. An
adjustable trip delay is provided to prevent nuisance tripping
and an adjustable restart delay has been provided for
applications requiring a delay to start an additional load.
When AC current is 5% or greater than the drop-out set point,
the relay will pick-up after the completion of the restart delay.
The RUN status light will blink during the restart delay and
remain on when the relay energizes. When the AC current
remains at or below the drop-out set point for a period longer
than the trip delay, the relay will drop-out. The RUN status
indicator will remain on during the trip delay time indicating
the relay is still energized. The FAULT status indicator lights
during an undercurrent condition.
LED STATUS INDICATORS
STATUS INDICATORS
FAULT (RED LED) RUN (GREEN LED)
OFF ON RELAY ON
OFF BLINKING
ON ON
ON OFF
RESTART DELAY TIMING,
RELAY OFF
UNDERCURRENT CONDITION,
TRIP DELAY TIMING,
RELAY ON
UNDERCURRENT CONDITION,
RELAY OFF
STATUS
TOP VIEW
FRONT VIEW
SPECIFICATIONS
MODEL 171
Operating Voltage 120VAC
Frequency 50/60Hz
Power Consumption 2W
Drop-out Adjustment 0.1 - 1 A
Pick-up Set Point Fixed at 5% above Drop-out set point
Repeat Accuracy +/- 0.5% of set point
Trip Delay 0.1 - 10 sec
Restart Delay 0.1 - 300 sec
Timing Accuracy +/- 5%
Reset Type Automatic
Output Contacts SPDT 10A at 240VAC resistive
Expected Relay Life Mechanical: 10 million operations
Electrical: 100,000 at rated load
Operating Temperature - 20 to +131 ºF
Humidity Tolerance 0 - 97% w/o condensation
Enclosure Material NORYL cover; 6/6 Nylon base
Mounting 8-pin socket**
Weight 6.3 oz
** Order 8-pin socket number 51X120
DIMENSIONS
11440 Ea s t P in e S tre e t
Tu l sa , Ok l ah o ma 7 41 1 6
04/2017
© 2017 TIME MARK CORPORATION
MODEL 171
TIME MARK is a division of
1 AMP CURRENT MONITOR
READ ALL INSTRUCTIONS BEFORE INSTALLING, OPERATING OR SERVICING THIS DEVICE.
KEEP THIS DATA SHEET FOR FUTURE REFERENCE.
GENERAL SAFETY
POTENTIALLY HAZARDOUS VOLTAGES ARE PRESENT AT THE TERMINALS OF THE MODEL 171.
ALL ELECTRICAL POWER SHOULD BE REMOVED WHEN CONNECTING OR DISCONNECTING WIRING.
THIS DEVICE SHOULD BE INSTALLED AND SERVICED BY QUALIFIED PERSONNEL.
Installation Instructions
INSTALLATION
Mount an 8-pin socket in a suitable enclosure. A NEMA-1
rated enclosure is available from Time Mark Corporation.
Connect 120VAC control power to terminals 5 and 6.
Connect the relay output contacts on terminals 1, 2, and 8
as required for the application.
Connect the internal current shunt resistor in series with
the load and proper short circuit protection device (e.g. a
fuse) rated maximum of 10A (shunt is between pins 3 & 4).
Refer to wiring diagrams for examples of typical
applications.
PIN DRAWING
NOTE: When installing the Model 171 Current Monitor in areas
of high humidity or contamination, it is recommended that the base
area and all exposed metal parts of the socket be coated liberally
with a good quality silicone grease, such as Dow Corning DC-4 or
DC-4X. Insert the unit into the socket and wipe off excess grease
around the base. This will prevent the entrance of moisture and
other contaminates into the base and socket areas.
ADJUSTMENT SETTINGS
Set both delay adjustments fully counterclockwise and the
drop-out adjustment fully clockwise. Apply normal
operating current, then adjust drop-out control
counterclockwise until the Model 171 just picks up. This will
result in the unit dropping out on relatively small current
changes.
Increase trip delay as needed to prevent nuisance tripping.
Set the restart delay as required for the application.
TROUBLESHOOTING
Should the Model 171 Monitor fail to operate properly, check
all connections to the monitor, and to the control circuits.
Verify that the proper voltage and currents are present, and
check all fuses.
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.
11440 Ea s t P in e S tre e t
Tu l sa , Ok l ah o ma 7 41 1 6
04/2017
© 2017 TIME MARK CORPORATION
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