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Vertical-Axis Load Drops when Brake is Applied
The sequence is incorrect. The MxC goes into DC injection braking status for 0.5 seconds after deceleration is
completed (this is the factory-set default).
To ensure that the brake holds, set Frequency Detection 2 (H2-01 = 5) for the multi-function digital output ter-
minals (M1 and M2) so that the relays will switch off when the output frequency is greater than L4-01 (3.0 to
5.0 Hz). The contacts will switch on again when the output frequency falls below L4-01.
There is hysteresis in Frequency Detection 2 (i.e., a frequency detection width, L4-02 = 2.0 Hz). Change the
setting to approximately 0.5 Hz if there are drops during stop. Do not use the multi-function digital output run
signal (H2-01 = 0) for the brake on/OFF signal.
Motor Overheat
Take the following steps if the motor overheats.
The load is too big.
If the motor load is too heavy and the motor is used with the enabled torque exceeding the motor's rated
torque, the motor will overheat. Some motor rating are given for short period performance and are not contin-
uous ratings. Reduce the load amount by either lightening the load or lengthening the accel/decel time. Also
consider increasing the motor capacity.
The ambient temperature is too high.
The motor rating is determined within a particular ambient operating temperature range. The motor will burn
out if it is run continuously at the rated torque in an environment in which the maximum ambient operating
temperature is exceeded. Lower the motor's ambient temperature to within the acceptable ambient operating
temperature range.
The voltage tolerance between motor phases is insufficient.
When the motor is connected to the MxC output, a surge is generated between the MxC switching and the
motor coil. Normally the maximum surge voltage is three times the MxC's input power supply voltage (i.e.,
1,200 V for 400 V class). Be sure to use a motor with a voltage tolerance between motor phases that is greater
than the maximum surge voltage. In particular, when using a 400 V class MxC, use a special motor for invert-
ers.
Auto-Tuning has not been performed for Open Loop Vector Control.
Open Loop Vector Control will not operate the motor if Auto-Tuning has not yet been performed. Perform
Auto-Tuning, or calculate and set the motor parameters manually. Alternatively, change the Control Method
Selection to the V/f Control Method (A1-02 = 0).