Parker PVD 3405D Betriebsanleitung Seite 13

RS
2.7 Troubleshooting
You note that the
motor does not
turn by hand
You have difficulty
starting the motor or
making it run
You find that the
motor is drifting
You notice that the
motor is racing
You notice
vibrations
You think
the motor is
becoming
unusually hot
You think brush
wear is abnormal
You find
that the motor is
too noisy
− Check that there is no mechanical jamming or sticking.
− Check the brake power supply and its polarity.
− Check the fuses, voltage at the terminals (the load may be too high or the
bearings may be seized) and the load current.
− Check the electricithy supply to the brake (+24V, ±10%) and its polarity
− Check the contact between the brushes with an ohmmeter. The resistance
between the terminals should be between 0.1 and 5 Ohms.
− Check any heat protection.
− Adjust the servoamplifier offset, after having set the speed input at zero.
Reverse the tachometer wires : if the servomotor is turning in the wrong
direction, reverse the wires on the motor and the tachometer. If the motor is still
racing, reverse the A and B outputs of the encoder. Ensure that the induced
voltage is not too high.
− Check the encoder and tachometer connections, the earth connections
(carrefully) and the earthing of the earth wire, the setting of the
servoamplifier speed loop, tachometer screening and filtering.
− Check the stability of the secondary voltages (± 15V)
− It may be overloaded : check the current and the operating cycle of the
servomotor.
− Friction in the machine may be too high :
•
test the motor current with and without a load :
•
Check the motor doesn't have thermal insulation.
•
Check the brake doesn't rub when it is energized.
•
Check the good functioning of the ventilation if the servomotor has
one.
•
Servoamplifier incorrectly set (excessive gain)
Check :
•
whether the servomotor is mechanically overloaded,
•
any deformation of the current and current smoothing,
•
maximum supply voltage,
•
atmospheric pollution,
•
motor vibration and noise,
•
whether the correct brushes are being used, or the brushes are sliding
freely,
•
whether the operating cycle is appropriate,
•
whether the armature is short-circuiting.
Several possible explanations :
•
Unsatisfactory mechanical balancing
•
The brake rubs (mechanical seizing)
•
Defective coupling
•
Loosening of several pieces
•
Poor adjustment of the servoamplifier or the position loop : check
rotation with the loop open.
PVD 3405 - 01/2023
13