User manual 3-7
DSC/DSCT Series
SAFETY ACTIVE DESCRIPTION REMEDIES
A5 Motor thermal
switch alarm
The motor temperature
sensor has switched on
because of excessive coil
temperature.
Check the motor cooling circuit is complete ; the
ventilator, its feed, the slits and filters for the entry of
air, and if necessary replace or clean them, and also
check that the ambient temperature (near to the
motor) is within the permitted limits for the technical
characteristics.
If everything is in order and the alarm signal is still on
even when the motor is cold, check the connector
wires of the thermal probe and of every auxiliary
devices.
If it’s used a motor with thermal bimetallic protection, if this is
measured between pins 1 and 2 of J4 it must be closed. If it’s used
a motor with thermal protection like PTC, from pins 1 and 2 of J4 it
must be measured it’s nominal value at the corrisponding ambient
temperature
.
A6 Motor in thermal
overload
The motor overload safety
electronic device has been
activated by excessive
current absorption for
prolonged period.
Check the motor load and consider if its reduction
may stop the intervention of the safety function.
Check the level of the setting thermal current, if
necessary correct it, and also check that the value of
the thermal constant is sufficiently long.
Check the power of the motor being adequate to the
load and if necessary increase it.
A7 Resolver failure Resolver failure indicates
that the drive does not find
its proper resolver
connection
Check the resolver connections and that all
connections have been made according to the
connection scheme (see motor user’s manual and
connection scheme).
Check the resolver shield and grounds being
connected properly (in particular the resolver shield
must be wired to pin 1 or 2 of J6, and then the 0V
must be grounded).
A8
Intervention of
the external
alarm
The external enable signal
is no more present, and
the drive has not the
consent to work
The external safety has removed the enable signal to
the drive: give it back and reset.
The continuity of the connection has been lost; check
and remove the fault.
A9 Overspeed The drive indicates that
motor speed is above the
max. allowed. (P52)
Check the parameters that change the motor
dynamics (P23, P24, P25).
A10 Minimum voltage
in the DC power
circuit
The voltage of the
intermediate circuit of the
drive is below the
minimum range.
The safety functions is
tripped when the input
voltage drops below the
permitted value
Undervoltage may occur when the main transformer
power is not sufficient to support the loads, or in case
that there is not the correct 220 AC three phase
voltage (for instance one phase is not powered).
Check the voltage in RST .
A11 Overvoltage of
the DC power
circuit
The voltage of the
intermediate voltage circuit
is strongly increased due
to excessive regenerative
energy coming from the
motor, e.g. in slow down
phase, and the limit of
overtension is exceeded
This alarm can happen if the motor is often breaking
in his working cycle. Even overvoltage on the mains
side can lead to the intervention of this safety function.
If the drive has a clamping circuit check that the value
of the resistor is not too high to absorb the peak
power.
Check, if the resistor is not heating up, its continuity,
the connections and functionality of the circuit itself.
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