MCS- 84/92 Digital Brushless AC servo drive system - Ref.0707
Causes. The hardware of the drive module has detected that the voltage at the
power bus is too high.
Solution. Check the connection of the external Ballast resistor (if applicable) and
make sure it is in good condition.
Disconnect the power supply and check the proper connection of the
Ballast circuit.
Cause. The mains voltage is lower than the admitted minimum voltage.
Solution. Disconnect the power supply and check the proper condition of the lines.
Cause. Ballast resistor overload because the duty cycle forced on the circuit is
too demanding.
Cause. Resize the ballast resistor for the required duty cycle or set a less
demanding duty cycle.
Smooth the duty cycle by applying acceleration ramps.
Cause. Incompatible drive parameter setting.
Ej: A drive to govern a motor. The motor admits a peak current of 20 A.
The drive parameter that sets the current limit is set CP20 = 20.
If now, a 16A peak motor is connected, the current limit will be beyond
the value allowed for this new motor. The CP20 value set previously is
higher than the one allowed for this new motor.
The drive notices this incompatibility and readjusts (in RAM memory)
certain parameters related to speed and current and issues E.502 . The
QV22 variable indicates the parameters that are incompatible with each
other so they can be set properly.
Observe that resetting the unit without saving the parameters causes the
error to come up again. To avoid this, execute the GC1 command that
permanently saves into E
2
PROM memory the parameters readjusted by
the drive in RAM memory with their proper values.
E.304 Power bus voltage of the drive too high
E.307 Power bus voltage too low
E.314 Ballast circuit overload
E.502 Incompatible parameters
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