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en - Original instructions
• For the models MMW and MTW, the sensor is in-
ternal. Contact the assistance service.
• For the models MMA and MTA, the sensor is ex-
ternal and the alarm is triggered with a < 3.2 mA
or > 22 mA signal.
• Check that the sensor and connector are con-
nected.
• Open the cover and check that the power cord of
the sensor is connected and secured to the ter-
minals. See
Figure 15
• Check the cable of the sensor is connected cor-
rectly. See
Figure 15
• The power cable of the sensor has deteriorated:
replace the cable.
• Replace the faulty sensor.
N°
Text on
Model
the dis-
play (*)
A6
OVER
MMW
TEMP
MTW
MMA
MTA
Troubleshooting:
• Models MMW and MTW: the temperature of the
power module has reached the value of 80°C. In
AUTOMATIC mode, the converter stops the
pump and does not restart it until the tempera-
ture falls below 60°C.
• Models MMA and MTA: The cooling fan turns on
at 60°C and turns off at 50°C (both MMA12 and
MTA10 have a fan). If the temperature reaches
85°C, the output frequency of the motor is auto-
matically reduced by 3Hz down to 75°C. At 95°C,
and in AUTOMATIC mode, the converter stops
the pump and does not restart it until the temper-
ature falls below 80°C.
• Models MMW and MTW:
• The temperature of the water exceeds the
limits for use of the converter. See
data.
• The power module is faulty: contact the assis-
tance service.
• The ambient temperature exceeds the limits for
use of the converter. See
• Models MMA12 and MTA10:
• The cooling fan is faulty. Contact the assis-
tance service.
• The cooling fan does not work.
• Open the cover and check the power cable of
the fan is connected and secured to the rela-
tive terminals. See
N°
Text on
Model
the dis-
play (*)
A7
SHORT
MMW
CIRC
MTW
MMA
40
.
.
Descrip-
Reset
tion
Alarm in-
Automat-
dicating
ic.
that the
power
module
of the
converter
has su-
perheat-
ed
Technical
Technical
data.
Figure 15
.
Descrip-
Reset
tion
Alarm in-
Automat-
dicating
ic. A max
a short
of 4 at-
N°
Text on
Model
the dis-
play (*)
MTA
An automatic function of the converter that detects
current consumption while the motor is running. The
converter cuts out the power supply to the motor and
remains locked.
Troubleshooting:
• The motor is damaged and must be replaced.
• The power cable of the motor is faulty or worn:
replace the cable.
N°
Text on
Model
the dis-
play (*)
A8
OVER
MMW
VOLT
MTW
MMA
MTA
An automatic function of the converter that detects
the voltage value of the power line. The converter
stops the electric pump when the voltage value ex-
ceeds the permitted limit (254 V). The pump auto-
matically starts up when the voltage drops below the
limit (chapter 2.5).
Troubleshooting:
• Problems with the power line: contact the utility
provider.
• For systems with more than one pump, the elec-
tric pump with converter acts as a current gener-
ator when the non-return valve of the hydraulic
system is faulty. The water flows through the
non-return valve in the opposite direction.
• The DC Bus power circuit of the converter is faul-
ty.
N°
Text on
Model
the dis-
play (*)
A9
UNDER
MMW
VOLT
MTW
MMA
MTA
Descrip-
Reset
tion
circuit on
tempts to
the pow-
start are
er supply
made at
side of
2 second
the mo-
intervals.
tor
The
pump is
perma-
nently
locked if
the alarm
perse-
veres af-
ter the
reset
tests.
Descrip-
Reset
tion
Alarm in-
Automat-
dicating
ic
the volt-
age sup-
ply of the
converter
is high
Descrip-
Reset
tion
Alarm in-
Automat-
dicating
ic
that the
voltage
supply of
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