XMPI0MTIRPD2ST021 22/24 Ed. 2021
12 DIAGNOSTICS AND TROUBLESHOOTING
12.1 INTERVENTION OF PROTECTIONS
Tripping of any inverter protection will cause the motor to stop. The display shows:
− the number of protection errors that occurred;
− the codes for the last five errors.
The "error in progress" condition and error codes can also be acquired via ModBus (ask for the "ModBus
Manual" for full details).
Appropriate programming of the outputs can allow the signalling to external equipment of the possible
presence of errors (or the NON-presence of the same). The programmability of the output function is limited
to the error condition only, it is not possible through the digital outputs to obtain information about the type
(code) of error occurred.
The electronic protections in the inverter are as follows:
• Over-temperature: Triggers when the temperature of the power module exceeds 80°C. In the event of an
intervention, check that the motor-inverter is installed in an area with sufficient air exchange to lap the
inverter's external enclosure. Warning: this protection has no connection with the engine temperature.
However, optimum thermal protection of the motor is already achieved with cosɸ control (see cosɸ
protection, explained later).
• Overcurrent: Triggers in the event of an instantaneous overcurrent at the output (to the motor). It can also
operate under special working conditions with particularly low supply voltages and high mechanical loads
applied to the motor axis and presumably to the pump itself.
• Overvoltage: triggered when the voltage at the ends of the capacitors rises above the maximum permitted
value. It is a condition that can occur if abrupt decelerations are performed with highly inertial loads (a very
rare condition in this type of machine). It may also occur due to a supply voltage exceeding the inverter's
operating limit. In this case, the deceleration time must be increased (parameter S010). In the case of
repeated tripping, it is necessary to check whether the error occurs during engine deceleration, at standstill
or at constant speed.
• Cosɸ protection: this is protection linked to the actual measurement of the power factor that the inverter
takes on the motor moment by moment. The standard parameters on the basis of which the inverter
performs the calculation (hidden parameters) provide extremely effective protection of the motor against
overheating under all operating conditions. Changing these parameters is not normally recommended to
solve problems related to the repeated triggering of this protection (which must be solved by adding
auxiliary ventilation to the motor, otherwise the motor may burn out). Doseuro recommends the
application of the servo-ventilated motor for continuous use (over 30 min.) of the pump at a frequency <=
20 Hz. For more details and possible optimisation of protection, please contact our Technical Support.
• RS485 communication error: intervenes in the event of a timeout on RS485 communication (refer to the
"ModBus Manual" for full details).
• Communication Line" error: this is an internal error and indicates a probable fault on one of the two
microprocessors in the inverter.
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