95
Error probable cause measure
OVERLOAD
ERROR 12
Power limit of the HYDROVAR
is exceeded
• check Parameter RAMP 1/2
[0215/0220] (too short) and BOOST
[0265] (too low)
• check motor connection
(star/delta) and cable
• Pump blocked
• Motor turns in the wrong direction
before running
(Non return-valve defect)
Not allowed operation point or
MAX. FREQUENCY [0245] too high
check also the BOOST [0265].
OVERVOLTAGE
ERROR 13
DC voltage of the HYDROVAR
too high
• Parameter RAMP 2 [0220] too fast
• Power supply too high
• Voltage peaks too high
• (Solution: Line filters, Line
inductance, RC-element)
INVERT. OVERHEAT
ERROR 14
too high temperature inside
the HYDROVAR
• no proper cooling
• contamination of the motor vents
• ambient temperature too high
THERMO MOT/EXT
ERROR 15
An external protective device
connected to terminal X1/PTC
has released (e.g. PTC which is
connected has reached its
release temperature)
• close X1/PTC if there is no external
protective device connected
• close external on/off switch if
connected to these terminals
• For detailed information how the
terminal X1/PTC could be used see
chapter 9.4.3
PHASELOSS
ERROR 16
One phase of the power supply
has been lost -> automatic
power reduction (just available
for the units HV4.055-4.220)
• check power supply under full load
– check if phase failure at the input
• check circuit breakers
• visual inspection of points at the
input terminals
UNDERVOLTAGE
DC voltage of the HYDROVAR
too low
• supply voltage too low
• phase failure at the input
• asymmetry of the phases
COMM LOST
The communication between
the Power Unit and the control
card doesn’t work correctly
• check if the addressing of BASIC
Inverter [DIP SW.] has been done
correctly (retry!)
• check if each unit has allocated its
own pump address
• check if the connection from
control card to the power unit is
made properly (ribbon cable)
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