EMR-5000
IM02602012E
Turn OFF LAT unless the application specifically demands it. Use a zero
speed switch with LAT. Using an LAT setting greater than locked rotor time
without a zero speed switch temporarily defeats thermal protection and
damages the motor if the rotor actually is locked.
If LAT is used, check the settings of transition time TRNT and jam start delay to be sure they are coordinated with the
prolonged starting cycle.
Incomplete Sequence Report Back Time (INSQ)
The incomplete sequence function requires an input from the report back contact from the process that the motor is
running. Shortly after the motor starts, the report back contact provides an indication that the process has started to
operate as expected. If the process does not start up correctly, the contact does not close within the expected time. If
a problem develops later on, the report back contact opens. In either case, the open contact state indicates that the
motor should be tripped.
To use this function, set a time limit for report back here and define the start of report back timing. Connect the report
back contact to one of the protective device Discrete Inputs. If this input is not energized before the set time expires,
the relay will trip on an “Incomplete Sequence”.
Note that the input must be energized continuously after the time delay has expired to hold off this trip. Otherwise, if the
incomplete sequence report back contact changes state for a period greater than 0.5 seconds, the relay will trip on an
incomplete sequence. This delay allows for any momentary transient switching that may occur in the process report
back contact, such as that which can occur in an open transition reduced voltage start.
Emergency Override
If enabled, an emergency override can be executed by pushing the Emrg Override button behind the front panel
security door. In any case, an emergency override can be performed by a remote contact connected to any one of the
discrete inputs programmed as EMG OVR, or via front panel under Operations\Reset menu. The as-shipped setting is
disabled.
Emergency override allows a panic restart of a tripped motor without completely disabling protection. When the
override request is received, the thermal-model accumulator bucket is drained to its initial level of 40°C (104°F).
Jogging limit counters and timing, including anti-backspin timing, are reset. Cold starts are fully restored.
The motor protection is now in the state it would be in if the motor had been standing for a long time prior to the moment
of the override. This allows an immediate restart of the motor. The override can also delay an impending thermal trip of
a running motor. The emergency override action is counted in the history record, and noted with its time tag in the
logbook record.
The emergency override function clears and restarts all protective functions of
the protective device. Using this function can damage the motor. Use it only
for true emergencies, when it is known what caused the trip. Override permits
the risk of motor damage to avoid an even more dangerous process situation
caused by the tripping of the motor.
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