GE Motor Protection System, LM10 Other Settings, PATH Configuration ØØØØØ Time Delays

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:

watts = 1.732 ⋅ average current ⋅ voltage ⋅ power factor (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.

4.2.7Time Delays

PATH: Configuration ØØØØØ Time Delays

Configuration	Time Delays
Time Delays „	AuxSns1	.4
Other Settings
Aux Rly Faults
	Time Delays
	AuxSns2	.4
	Time Delays
	Run1-Run2		0
	Time Delays
	Run2-Run1		0

Range: 0.1 to 25.0 s in steps of 0.1 or Disabled

Range: 0.1 to 25.0 s in steps of 0.1 or Disabled

Range: 0 to 600 s in steps of 1

(0 to 180 s in steps of 1 for revisions 1.40 and lower)

Range: 0 to 600 s in steps of 1

(0 to 180 s in steps of 1 for revisions 1.40 and lower)

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.

4.2.8Other Settings

PATH: Configuration ØØØØØØ Other Settings

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

4–34 LM10 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL