Calpeda SDP Betriebsanleitung Seite 94

The permanent magnet synchronous motor must be used with an inverter and output filter (see "General requirements for the use of INVERTERS").
When sizing the inverter for the permanent-magnet synchronous motor, its nominal data and those of the electric motor must be taken into account.
Before installation, check that there are no system factors (e.g. voltage drops at the motor input) that could increase the current drawn
by the motor compared to the rated current of the inverter, especially if the rated currents of the motor and inverter are similar. In case of
doubt, contact the Calpeda sales network.
General prescriptions for the use of the INVERTER
GB
- the minimum frequency must not be less than 30 Hz during the starting phase and/or during operation and 60 Hz for permanent-magnet
synchronous motors in order to maintain the voltage/frequency ratio at a constant level
- in certain cases, the motor must be fitted with an electric winding for hot water so as to make up for losses due to a less-than-optimum waveform.
Contact the technical offices for specific details;
- max acceleration ramp time: see table;
- max deceleration time: equivalent to twice the maximum acceleration time.
- Maximum inverter switching frequency ≤5kHz
The inverter programming for use with permanent-magnet synchronous motors is described in the Technical data, dimensions and weights section.
When installing sine-wave filters, it is necessary to ensure compliance with what is indicated in the section "Operating limits by winding
type" in the chapter "Technical data, dimensions and weights".
The installation of filters is required to consider the motor under warranty
Conditions to be complied with regardless of the length of the power cables.
General prescriptions for the use of the SOFT STARTER:
a) the SOFT STARTER device must carry out a voltage ramp starting or a constant current starting;
b) the SOFT STARTER device must not carry out a current ramp starting or a torque ramp starting;
c) maximum deceleration time equal to twice the maximum acceleration time;
d) deceleration method either by freewheel or by voltage ramp, not by braking;
e) always make sure that the soft-starter is off once the assembly start phase has completed;
In case of malfunctioning of a system featuring a soft starter or inverter start, verify, if possible, the operation of the electric pump
assembly by connecting it directly to the grid (or with another device).
6.2 Operation and inspections:
Before starting the electric pump unit it is mandatory to check and comply with the limits below:
• Maximum number of start-ups/hour
• Motor minimum cooling speed
• Temperature of pumped fluid
According to what indicated in the tables "Indicative weights and overall dimensions" in chapter 10, the non-observance of the rules listed above,
failing to guarantee the correct operation of the electric pump unit and in particular of the submersible electric motor. will void the warranty of the product.
WARNING Once installed, the electric pump will not need any particular maintenance. However, to ensure that it continues to function correctly
over time, it should be frequently inspected at least every 3 months or after every 1000-1500 hours service, during which time the
parameters indicated in the 'Operation report' should be checked. In addition, the efficiency of all the electrical equipment should be
checked every 6-12 months.
If operation is faulty, find the causes and proceed as a consequence, as described in this manual.
In case of PT100 probe inside the motor, whose function is to check its temperature, follow the procedure below for the setting
of the machine stop and warning temperature thresholds:
a) Start the electric pump and set to the duty point with the highest absorbed power; the temperature inside the motor will increase progressively
and will be monitored by the probe. Upon reaching the operating conditions (depending on the motor up to 2 hours may be required) the read
temperature will stabilise.
b) When the temperature reading is stable set the first alarm (warning) to a value equal to the read temperature +3°C; the alarm will record the
exceeding of this value, as evidence for the next inspection;
c) The second alarm (machine stop), that must stop the motor, will have to be set to a value equal to the read temperature +6°C: the following
start-up, with recording of the exceeding of machine stop threshold, can be automatic but it should occur with a delay from the stop of at least 15
minutes or at an internal temperature of the motor lower than 20°C compared to the temperature set for the machine stop alarm;
The triggering of the 1
st
been restored.
The triggering of the 2
nd
1) There is an overload
2) There is a poor cooling
3) There are frequent start-ups
If the 2 alarm is triggered, the motor cannot be restarted before the causes of the malfunction have been verified.
nd
If the procedure described above is not followed, notwithstanding the checks and obligations of the operation limits listed above, it will be possible to
set the machine stop threshold (2
Calpeda strongly recommends setting the maximum temperature of the second alarm as indicated in the section "Operating limits by winding type"
in the chapter "Technical data, dimensions and weights".
These limits allow preventing permanent damages to the motor and their non-observance will void the warranty of the product.
NOTE: temperature monitoring with probe PT100, even with a correct setting of the stop threshold, does not protect the motor against
hazardous localised overtemperatures when the correct cooling is not guaranteed (water speed outside the motor lower than the required
one indicated in the table available in the "Technical data, size and weights" section of the manual).
In these cases, change the installation or use a suitable cooling stage casing.
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alarm can indicate a motor malfunction: check motor temperature to verify whether the standard working condition has
alarm, with motor stop, occurs when:
alarm)
nd