18
IMTP 2.2 - ITTP 2.2/4/5.5/7.5
ENG
8
The Inverter stop the motor for
Minimum Flow with a high flow
condition and then re-start and
stop again, continuously
A small water membrane Tank charged with 1.5-2 Bar air pressure is required for a
correct working; check it.
The condition may also caused by a not correct pump curve saving during the
automatic check: possibly the delivery was not totally closed and the Inverter checked
a higher curve of the pump; repeat the automatic check (Pump data -> check ON,
then exit to the menu and press START) closing totally the outlet and try again the
functioning.
Verify if there is a no-return inlet valve on the pump and if itÕs working good without
loses.
ItÕs possible to reduce the flow before stopping reducing the parameter F1
ItÕs possible to reduce the flow before stopping reducing the parameter Minimum Flow
Power stop % on Motor Data.
9
The inverter donÕt switch off the
pump when the valve on
delivery is totally closed
Probably check was done with pump not perfectly filled up; remake the check
procedure after a complete filling of the pump and try again if pump switch off correctly
in minimum flow condition. If the problem remain, try to grow up the function:
Advanced Functions -> Motor data -> Minimum flow power stop, upgrading 2% every
time and testing pump, till find the correct working.
10
The hydraulic system have a big
tank (>40 l) and, after check did
correctly with closed delivery,
the pump stop for minimum flow
with a high flow, and then re-
start and stop again,
continuously
Probably during the automatic check there was a flow of water to full up the big tank,
for that the pump curve saved by the inverter is not the correct curve (with null flow
and maximum pressure).
Maintain full of water the tank (pressure near maximum value); repeat the automatic
check (Pump data -> check ON, then exit to the menu and press START). When the
check finish try to work again testing the minimum flow stop condition of the motor that
must be with a small flow.
11
The Inverter stop the motor for
Dry Working condition
Sometimes the problem is caused by the same Automatic Check error that previous
point (see possible solution like above).
In other cases possibly there is air mixed with the water on the inlet of the pump
(verify pipes and junctions).
12
The pump donÕt switch off for dry
working when the inlet pipe and
the pump are empty
In normal working condition, with pump and pipes filled up, remake a check procedure
(Pump data -> Check=ON) and try again. If the problem remain grow up the
parameter: Motor Data -> Dry Working power stop, from 80% default value doing 10%
steps, testing every time the pump. If the problem cannot disappear also with Dry
working power stop more than 100%, verify that pump havenÕt any defect (fault seal,
impellers, etc) that can cause a big power absorbing also without water, in dry
condition.
13
A group of two or more inverters
cannot communicate between
each other in Master-Slave
mode
For the BC inverters type read on left.
For the RS type check the correct connection RS485 by a two wires cable (A to A and
B to B).
Verify the communication set to Master-Slave on Advanced Functions -> Group
Functioning (code 0 for the inverter Master, code 1, 2, etc for all the others Inverters
Slave)
14
The Inverter conduct on the
input voltage supply line
electromagnetic noises that
disturb other electronic devices
Check Ground cable connections (Ground system must be radial type, with resistance
less than 10 Ohm).
All the Inverters have an internal Input EMC filtering stadium, but is available also an
additional EMC Input filter (various types, contact the service) for bigger noise
suppression with sensitive devices connected on the line.
15
With a long cable between
Inverter and Motor sometimes
the inverter stop the motor in
Pick Current alarm
The motor can have high pick voltage value caused by the high frequency of the PWM
combined with the high capacitance to ground of the long cable: we suggest to use an
additional inverter output filter for cable longer than 40 meters connecting it directly on
the Inverter output. Available various types of output filters, contact the service to
receive informations.
16
The Differential Circuit Breaker
on the line sometimes switch off
the inverter
Check the Ground system resistance (must be less than 10 Ohm).
Use only differential circuit breaker type A (specific for Inverters).
17
The Magneto-Thermal Circuit
Breaker on the line switch off the
inverter when the pump run at
the maximum power
All the inverters may have a high pick value of the sinusoidal caused by the harmonics
(5
th
, 7
th
, 11
th,
etc.) and depending by the resistance of the line, but this condition
donÕt increase the energy absorbing value depending by the area under this current
curve. Only you need to use a Magneto-Thermal Circuit Breaker with a higher Current
value than the value that you can use for the direct pump controlled. Usually itÕs
enough a switch one step higher than the switch useful for the simple motor (see
table of the Magneto-Thermal protection suggested on the handbook).
Table 10: solution of the most common installing problems
8. GUARANTEE
Under the current European low: guarantee of 2 years calculated from the date of delivery of prejudice further
provisions of law or contract.
To have service in guarantee, it must submit to the company providing the guarantee certificate completed.
The guarantee is excluded or interrupted in anticipation if the damage is caused to the following:
External influences, non-professional installation, non-compliance with instructions, interventions by
unauthorized locations, use of not original spare parts and normal wear.
