GE LM10, Instruction Manual

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4–34 LM10 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
CONFIGURATION SETTINGS CHAPTER 4: FUNCTIONALITY
A 6% voltage unbalance equates to a roughly 25% current unbalance and will frequently
cause motor damage.
• LdLoss Setup (load loss setup): Load loss is based on watts, defined as follows:
(EQ 4.3)
The power factor is determined using the phase relationship between voltage and phase C
current readings. Full load would be when the average current is at FLA, voltage is at
nominal value, and power factor equals 0.85. This would equate to a load loss level of
100%. The
LdLoss Setup Fault
trip point is programmable as a percentage of this value.
The motor would need to drop below this level for the preset time to cause the load loss
fault. The relay is shipped with this option disabled.
4.2.7 Time Delays
PATH: Configuration
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Time Delays
The time delay settings are described below.
•
AuxSns1 and AuxSns2 (auxiliary sense failure): Should the LM10 detect that a
contactor did not open/close according to its command, an auxiliary sense (AuxSns)
trip failure will be recorded in the fault record and shut down the run relay. This fault is
factory preset at 0.4 seconds. The delay time for closing the relay can be changed
however opening time is set at a constant 0.4 seconds to detect contact welding.
Applications requiring a delay between the run command and the starter pulling-in can be
accommodated using this feature (for example, fans requiring damper closer before
running). The
AuxSns1
and
AuxSns2
time delays can be set to match the damper closure
time.
4.2.8 Other Settings
PATH: Configuration
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Other Settings
watts 1.732 average current voltage power factor × × ×
=
Configuration
Time Delays „
Other Settings
Aux Rly Faults
Time Delays
AuxSns1 .4
Range: 0.1 to 25.0 s in steps of 0.1 or
Disabled
Time Delays
AuxSns2 .4
Range: 0.1 to 25.0 s in steps of 0.1 or
Disabled
Time Delays
Run1-Run2 0
Range: 0 to 600 s in steps of 1
(0 to 180 s in steps of 1 for
revisions 1.40 and lower)
Time Delays
Run2-Run1 0
Range: 0 to 600 s in steps of 1
(0 to 180 s in steps of 1 for
revisions 1.40 and lower)
Configuration
Other Settings „
Aux Rly Faults
Passcode,login
Other Settings
U/O Volt En off
Range: On, off. Not available for
revisions 1.40 and lower