Weq CTW900, Руководство пользователя

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Troubleshooting and Maintenance .
136 | CTW900
8 TROUBLESHOOTING AND MAINTENANCE
8.1 SOLVING THE MOST COMMON PROBLEMS
Problem
Point to Be
Checked
Corrective Action
Motor will not spin
Wiring
■ Check all the power and control connections. If there are digital inputs programmed
as Run/Stop, General Enable or Without External Fault, they must be connected to
24 Vdc or DGND (see Figure 5.9).
■ Check if there is no short circuit between terminals XC1:11 and 13 (short circuit in
the 24 Vdc power supply).
Speed Reference
■ Check the speed reference setting: If it is too low, the motor cannot start.
■ If an external signal is being used for reference, check the wiring and if it is properly
connected.
Programming
■ Check if the torque current limits (P0169 and P0170) are too low.
■
Check if the acceleration ramp time is too high (P0100 and P0102).
Fault ■ Check if the converter is not disabled due to a fault condition.
Armature Circuit
■
Check the ultrafast fuses of the armature output (for converter 4-Q).
■
Check the thermostat of the DC motor (if applicable).
Locked Rotor ■ Check if the rotor is mechanically locked.
Burn of UF fuses
at power-up
Armature Circuit ■ Check if the armature circuit is in short circuit (thyristor damaged).
Fuses ■ Check if the fuses were specified correctly (Tables 5.2 and 5.3).
Programming
■ Check if the parameterization is according to the application (especially the settings
of P0169/P0170 and P0100/P0102).
Ground Insulation ■ Check if the motor or converter have ground insulation problems.
Burn of the UR
fuses in the
braking (CTW900
4-Q)
Thyristors ■ Check if any thyristors are in short circuit.
Power Line
Voltage
■ Check if there are momentary faults in the line voltage.
Armature Voltage
■
Check if the armature voltage is above the maximum rated speed.
Burn of UR fuses
when the motor
load varies or the
motor
accelerates/brakes
(CTW900 4-Q)
Programming
■ Check if the current limits (P0169 and P0170) are too low.
■
Check if the dynamic of the current regulator is well set (see section 6.4.2
).
Incorrect speed
control
Feedback
■ If the feedback is by EMF, check if the setting of P0400 and P0402 is according to
the data of the motor nameplate.
■ If the feedback is by tachogenerator, check if its connection is according to the
desired operating range (see section 6.3.2) and if the setting of P0406 is correct.
■ If the feedback is by encoder, check if the setting of P0405 is correct.
Armature Current
■
Check if the motor is operating in current limitation and, in this cases, set the value
of P0169/P0170.
Speed Reference
■ If an external signal is used for reference, check if the signal level is correct. Also
check the programming of gains and offset (P0232 to P0249).
Programming
■ Check if the setting of minimum speed (P0133) and maximum speed (P0134) is
correct.
Field Current ■ Check if the field current is oscillating.
Oscillation of the
motor current
and/or speed
Regulators ■ Check if the current and speed regulator are well set (see section 6.4).
Tachogenerators
■ Check if the signal of the tachogenerator presents noise.
■ Check if the coupling of the tachogenerator is properly fastened.
■ Check if the cable of the tachogenerator is close to the power cables and, if so, if
the cable used is shielded.
Analog Reference
■ Check if the analog reference signal is varying. If the reason is electric noise, use
shielded cables or move the cable away from the power or control wiring.
■ If a potentiometer is being used to generate the reference signal, check if it is
working properly.
Motor will not go
into field
weakening
Feedback
■ Check if P0202 (Speed Feedback) is configured for Taco DC or Encoder, because it
is not possible to operate in the field weakening area by EMF.
Programming
■ Check if the value of P0177 (Minimum Field Current) is correct (smaller than P0404).
■ Check the setting of P0179 (Field Weakening Point) and P0400 (Rated Armature
Voltage).
Display off
Keypad
Connection
■ Check if the keypad connection to the converter is correct.
Electronics Fuse
■ Check if fuse F1 of the electronics (located on the IC900 board) is burned. If so,
replace it.