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WELD SENTRY 2
PROGRAMMING THE LINE MON'ITOR
LINE MONITOR: Select this feature from the Main Menu to setup the Sentry to monitor an
external Power Line. Refer to Section 2 - Installation and Section 4 - Specifications.
The Line Monitor screen is shown below. If no voltage is sensed at the Line Monitor input on the
rear panel, an error message will flash at the bottom. "No Line Monitor Input" and the Line Monitor
Mode cannot be changed.
NOMINAL LINE - This is the specified line voltage of the power line connected to the line monitor
input on the rear panel of the Sentry. Refer to Section 2 - Installation.
ACTUAL LINE - The result of the power line voltage measured by the Weld Sentry.
LINE MONITOR MODE - Defines the way the line monitor operates.
STOP will cause the sentry to assert a "line out of limit" status alarm. This status alarm will be
canceled by pressing [RUN]. The Sentry cannot monitor while this status alarm is active. When
the relay output is set for line stop: yes, the relay will also stay closed while the status alarm is
active.
DYNAMIC will cause the alarms and the relay to stay closed until the line remains within limits
for the set number of cycles (restart time).
ALARM ONLY will cause the alarm to sound and "Line Voltage is Outside of Limits" will be
displayed at the bottom of the screen. The alarm condition will clear immediately when the line
returns within limits. If the out of limits time is very short, the relay signal may be too short to
be recognized.
OFF will disable the line monitor. However, if "Print Deviations" is YES, power line deviations
will still print. Note: An incoming power line must be connected at the rear panel of the sentry
and line monitor jumper, E2, on the control board must be set in the correct position.
UPPER/LOWER LINE LIMITS - When the line voltage is above the upper line limit or below the
lower line limit, an alarm condition will signal depending on the mode selected. These limits are
separate from the Upper and Lower Limits programmed for each Sentry Schedule. One set of Line
Limits is in effect for all Schedules.
DYNAMIC RESTART -Applicable only when the line monitor mode is "Dynamic".
The line voltage must remain inside the upper and lower limits for this many cycles before the sentry
will reset the line deviation alarm condition. The alarm can be cleared manually before the end of
the restart time by pressing [RUN].
PRINT DEVIATIONS - Prints the power line deviations which occur when the Sentry is not actively
monitoring a weld. Information printed includes: date & time, number of cycles outside line limits
and maximum or minimum line voltage (extreme point).
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