Emerson E300 Series Design Manual page 392

Safety Product Mechanical
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L20 Phase Loss
Mode Open-Loop, RFC-A, RFC-S
Minimum 0
Default
Type 1 Bit Volatile
Display Format Standard
Coding RO, ND, NC, PT
If phase loss or imbalance is detected that would initiate a phase loss trip with sub-trip 0, i.e. Phase Loss.000, then Phase Loss (L20) is set to one.
Either the motor will be stopped and the drive tripped or the drive will continue to operate normally until the user stops the motor and the drive trips
(see Action On Trip Detection (H45)). In either case Phase Loss (L20) is set to one when the phase loss condition is detected and remains set until
the drive trips.
L21 Motor Overload Alarm
Mode Open-Loop, RFC-A, RFC-S
Minimum 0
Default
Type 1 Bit Volatile
Display Format Standard
Coding RO, ND, NC, PT
Motor Overload Alarm (L21) is set if the drive output current is higher than the level that will eventually cause a Motor Too Hot trip and the Motor
Protection Accumulator (J26) is higher than 75.0 %. See Motor Thermal Time Constant 1 (B20) for more details.
L22 Drive Over Temperature Alarm
Mode Open-Loop, RFC-A, RFC-S
Minimum 0
Default
Type 1 Bit Volatile
Display Format Standard
Coding RO, ND, NC, PT
Drive Over Temperature Alarm (L22) is set if Percentage Of Drive Thermal Trip Level (J79) is greater than 90 %.
L23 Motor Thermistor Over Temperature Indication
Mode Open-Loop, RFC-A, RFC-S
Minimum 0
Default
Type 1 Bit Volatile
Display Format Standard
Coding RO, ND, NC, PT
This gives an indication of whether the elevator motor thermistor has reached the thermal trip threshold. When set to Off (0) the motor thermistor
indicates that the temperature is healthy. When set to On (1) the temperature is not healthy.
L24 Active Alarm
Mode Open-Loop, RFC-A, RFC-S
Minimum 0
Default
Type 8 Bit Volatile
Display Format Standard
Coding RO, TE, ND, NC, PT, BU
392
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Parameters
Maximum 1
Units
Update Rate Background write
Decimal Places 0
Maximum 1
Units
Update Rate Background write
Decimal Places 0
Maximum 1
Units
Update Rate Background write
Decimal Places 0
Maximum 1
Units
Update Rate Background write
Decimal Places 0
Maximum 12
Units
Update Rate Background write
Decimal Places 0
E300 Design Guide
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