GE LM10 Instruction Manual page 41

CHAPTER 4: FUNCTIONALITY
LM10 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
One or more optional faults may be enabled after the basic functions are configured.
• U/O Volt En (undervoltage/overvoltage enable): This setting enables or disables the
under/overvoltage element. LM10 revisions 1.40 and lower do not support this setting.
Maximum and minimum voltage trip points are hard coded in the device and are not user
programmable. These points are approximately 80% and 117% of nominal voltage. This
corresponds to 96 V and 140 V with 120 V nominal voltage.
• Maintained (maintained switching): This setting distinguishes between maintained
(latched) versus momentary AC input switches. This is only applicable to Manual
control, and has no effect on control via DeviceNet. The default setting is "off" for
momentary switches. No seal in contact is required. In the maintained mode a run
switch must stay closed if opened the LM10 will stop the motor. The stop switch input
for safety reasons will interrupt the run relay in maintained or momentary mode. If the
run switch is on when the stop command is given, it will need to be turned off and
back on to get the motor running again. The stop command also interrupts the run
relay if controlled by the network. The network will need to send another run
command to restart the motor.
When using the maintained switching feature, potential safety hazards must be
considered and an appropriate setup chosen for each individual application.
• Auto Restart (power loss when running): The LM10 will be able to recover from a
power loss of up to 4 seconds and return to its previous run state. Enabling
autorestart allows the unit to restart the motor without operator intervention using a
momentary run input. The default condition is "off" – this would require the operator
to restart the motor after the LM10 regains power.
Other conditions may interfere with this operation. A fault condition like voltage or
DeviceNet may trip the LM10. Under the voltage condition the LM10 would be faulted
Other Settings Range:
Maintained off
Other Settings Range:
Auto Restart off
Other Settings Range:
DevNet Fault on
Other Settings Range:
50Hz Sys off
Other Settings Range:
Poll Data 1
Other Settings Range:
Reset Run Hrs.
CONFIGURATION SETTINGS
on, off
on, off
on, off
on, off
1, 2, 3, 4. Not available for
revisions 1.40 and lower
on, off
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