—————— TPD32-EV ——————
370
Other faults
FAILURE POSSIBLE CAUSES
The motor is not turning • Failure alarm is displayed: see table above
• Once the error has been rectified give the RESET command
• Keypad display is dark: voltage supply to terminals U2/V2 missing or internal fuse blown or
missing
• Enable and/or start command missing
• Converter not accepting commands: incorrect or wrongly selected operating mode
• Protective device of the power supply has tripped: protective device incorrectly sized or fault on
the thyristor bridge
• The analog input used for the reference value was not assigned or assigned differently
• Negative reference with TPD32-EV...2B. The reference for the biquadrant converters must always
be positive!
The motor is turning in a wrong
way
• Wrong polarity of the reference sign (with TPD32-EV...4B)
• The motor is connected in a wrong way.
ATTENTION:
when the motor turns in a wrong way but the rotation direction can be changed, remember to change
both the armature or field conductors and the two encoder connections (A+ with A- or B+ with B-).
Using a tachometer change the conductor polarity.
The motor does not reach the
rated speed
• Drive is within speed limitation. Remedy: check Speed max amount, Speed max pos and Speed
max neg parameters
• Drive working at current limit (LED ILimit lit) Possible causes:
• Motor overloaded
• Converter sized too small
• Flux reduction selected via Torque reduct.
• The entered value for the number of encoder pulses is too high. Remedy: check the parameters
concerned (Encoder 1 pulses when using plug connector XE1 or Encoder 2 pulses with plug
connector XE2) and set correct value.
• Wrong adaptation of the tachometer voltage. Check the voltage field choice (jumpers to the termi-
nals A/B/C). Check the Tacho scale parameter.
• A correction value reduces the main reference value. Remedy: check the configuration
• The factor function is set incorrectly.
The motor reaches the maxi-
mum speed immediately
• Reference value set via terminals: Check whether the value varies from min. to max. value. Poten-
tiometer used for reference value setting: is there a 0V connection present?
• Encoder/tachometer not connected, or incorrectly connected or not supplied:
• Preset the Actual spd parameter in the DRIVE STATUS menu.
• With the regulator disabled turn the motor clockwise (viewed from the front of the shaft). The
value indicated must be positive.
• If the indicated value does not change or if inexplicable values are shown, check the power
supply and the cabling of the encoder/tachometer.
• If the indicated value is negative, reverse the encoder connections. Exchange channel A+
and A- or B+ and B-. Using a tachometer change the conductor polarity.
The motor accelerates too
slowly
• Ramp set incorrectly
• Motor running at max. current
• Motor overloaded
• Converter too small
The motor decelerates too
slowly
• Ramp values and times incorrectly set
• Braking current too low
• With two quadrant drives: moment of inertia too high.
The motor turns slowly even
though the reference value =
zero
• Minimum speed selected
• Interference due to unused analog input. Remedy: set unused analog inputs to OFF
• Disconnect reference value on used analog input.
• If drive now stands still, the effect is due to the cable resistance of the 0V cable.
• If the drive is still turning: check if the speed reference is zero. If it is not zero set Offset input
xx parameter so that the drive stands still. If it is zero set Spd offset parameter.
The motor thermic is active • Overloaded motor
• Motor thermic protection relay incorrectly scaled
The motor is not supplying the
max torque and the max power
• Drive working at current limit
• Check whether the value for Full load curr in the CONFIGURATION menu is set correctly
• Check the value for the current limitation
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