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Diagnostics Optimization CT MODBUS RTU Technical Data
392 E300 Design Guide
Issue Number: 1
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.
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.
Drive Over Temperature Alarm (L22) is set if Percentage Of Drive Thermal Trip Level (J79) is greater than 90 %.
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.
L20 Phase Loss
Mode Open-Loop, RFC-A, RFC-S
Minimum 0 Maximum 1
Default Units
Type 1 Bit Volatile Update Rate Background write
Display Format Standard Decimal Places 0
Coding RO, ND, NC, PT
L21 Motor Overload Alarm
Mode Open-Loop, RFC-A, RFC-S
Minimum 0 Maximum 1
Default Units
Type 1 Bit Volatile Update Rate Background write
Display Format Standard Decimal Places 0
Coding RO, ND, NC, PT
L22 Drive Over Temperature Alarm
Mode Open-Loop, RFC-A, RFC-S
Minimum 0 Maximum 1
Default Units
Type 1 Bit Volatile Update Rate Background write
Display Format Standard Decimal Places 0
Coding RO, ND, NC, PT
L23 Motor Thermistor Over Temperature Indication
Mode Open-Loop, RFC-A, RFC-S
Minimum 0 Maximum 1
Default Units
Type 1 Bit Volatile Update Rate Background write
Display Format Standard Decimal Places 0
Coding RO, ND, NC, PT
L24 Active Alarm
Mode Open-Loop, RFC-A, RFC-S
Minimum 0 Maximum 12
Default Units
Type 8 Bit Volatile Update Rate Background write
Display Format Standard Decimal Places 0
Coding RO, TE, ND, NC, PT, BU
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