The grid is monitored for phase imbalance and phase loss. If the imbalance exceeds internal limits, a warning is provided and the user
can initiate proper actions.
In case of an under- or overvoltage on the grid, the drive will provide a warning and stop operation if the situation remains or exceeds
critical limits.
2.6.2
Drive Protection Features
The drive is monitored and protected during operation.
Inbuilt temperature sensors measure the actual temperature and provide relevant information to protect the drive. If the temperature
exceeds its nominal temperature conditions, derating will be applied. If the temperature is outside the allowed operating range, the
drive will stop operation.
The motor current is continuously monitored on all 3 phases. In case of a short circuit between 2 phases or a fault to ground, the drive
will detect this and immediately turn off. If the output current is exceeding its nominal values during operation for longer periods than
allowed, the drive will stop and report overload alarm.
The DC-link voltage of the drive is monitored. If it exceeds critical levels, a warning is issued and the drive will stop. If the situation is not
resolved, the drive will issue an alarm.
2.6.3
Motor Protection Features
The drive provides various features to protect the motor and the application.
The output current measurement provides information to protect the motor. Overcurrent, short circuit, ground faults, and lost motor
phase connections can be detected and relevant protections initiated.
Monitoring of speed, current, and torque limits provides an additional protection of the motor and the application.
Locked rotor protection secures that the drive is not starting with a blocked rotor of the motor.
Motor thermal protection is provided either as a calculation of the motor temperature based on the actual load or by the means of
external temperature sensors, for example PTC.
2.6.4
Protection of Externally Connected Components
Externally connected options like brake resistors can be monitored.
Brake resistors are monitored for thermal overload, short circuit, and missing connection.
2.6.5
Automatic Derating
Automatic derating of the drive allows continued operation even if the nominal operation conditions are exceeded. Typical factors
affecting this are temperature, high DC-link voltage, high motor load, or operation close to 0 Hz. Derating is typically applied as a
reduction in switching frequency or change in switching pattern, resulting in lower thermal losses.
2.7
Monitoring Features
2.7.1
Monitoring Features Overview
The drive offers a wide range of monitoring features providing information of operation conditions, grid conditions, and drive historical
data. Access to this information helps out analyzing operational conditions and identification of faults.
2.7.2
Speed Monitoring
The motor speed can be monitored during operation. If the speed exceeds minimum and maximum limits, the user is notified and can
initiate appropriate actions.
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Application Guide | iC2-Micro Frequency Converters
Summary of Contents for iC2
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