Cause
Possible Solutions
The drive has been set to accept the frequency
reference from the incorrect source.
Check parameter b1-01 (Frequency Reference Selection 1).
Set b1-01 to the correct source of the frequency reference.
0: LED operator
1: Control circuit terminal (default setting)
2: MEMOBUS/Modbus communications
3: Option card
4: Pulse train input (RP)
The terminal set to accept the main speed reference is
set to the incorrect voltage and/or current.
If the frequency reference is set at terminal A1, check parameter H3-01 for the correct signal level
selection. If terminal A2 is used, check DIP switch S1. Then select the correct input level for
terminal A2 in parameter H3-08.
Refer to DIP Switch S1 Analog Input Signal Selection on page 70
.
Selection for the sink/source mode is incorrect.
Refer to Sinking/Sourcing Mode Switch on page 68
.
Frequency reference is too low.
• Check the frequency reference monitor (U1-01).
• Increase the frequency by changing the maximum output frequency (E1-09).
Multi-function analog input is set up to accept gain for
the frequency reference, but no voltage (current) has
been provided.
• Check the multi-function analog input settings.
• Check if analog input A1 or A2 is set for frequency reference gain (H3-02/10 = 1). If so, check
if the correct signal is applied to the terminal. The gain and the frequency reference will be 0 if
no signal is applied to the gain input.
• Check if H3-02 and H3-10 have been set to the proper values.
• Check if the analog input value has been set properly.
The
STOP
button was pressed when the drive was
started from a REMOTE source.
•
When the
STOP
button is pressed, the drive will decelerate to stop.
• Switch off the run command and then re-enter a run command.
•
The
STOP
button is disabled when o2-02 is set to 0.
Motor is not producing enough torque in the V/f motor
control method.
• Ensure the selected V/f pattern corresponds with the characteristics of the motor being used.
• Set the correct V/f pattern to E1-03.
• When E1-03 = F, increase both the minimum and mid output frequency voltages (E1-08, E1-10).
Increase the frequency reference so that it is higher than the minimum frequency reference (E1-09).
Perform Line-to-Line Resistance Auto-Tuning when using particularly long motor cables.
Increase the torque compensation gain (C4-01).
Motor is not producing enough torque in Open Loop
Vector Control.
• Execute Rotational Auto-Tuning.
• If the motor cables are replaced with longer cables after Rotational Auto-Tuning was performed,
Auto-Tuning may need to be repeated due to voltage drop across the line.
• Check if the torque limit parameters have been set too low (L7-01 through L7-04).
• Reset the torque limit back to its default setting (200%).
Increase both the minimum and mid output frequency voltages (E1-08 and E1-10).
The drive is set for both 2-Wire and 3-Wire sequence
at the same time.
• The drive is set for a 3-Wire sequence when one of parameters H1-03 through H1-07 is set to
0.
• If the drive is supposed to be set up for a 2-Wire sequence, then ensure parameters H1-03 through
H1-07 are not set to 0.
• If the drive is supposed to be set up for a 3-Wire sequence, then H1-
oo
must be set to 0.
n
Motor Rotates in the Opposite Direction from the Run Command
Cause
Possible Solutions
Phase wiring between the drive and motor is incorrect.
• Check the motor wiring.
• Switch two motor cables (U, V, and W) to reverse motor direction.
• Connect drive output terminals U/T1, V/T2 and W/T3 in the right order to the corresponding
motor terminals U, V, and W.
• Change the setting of parameter b1-14.
The forward direction for the motor is setup
incorrectly.
Typically, forward is designated as being counterclockwise when looking from the motor shaft
(refer to the figure below).
1
2
1. Forward Rotating Motor (looking down the motor shaft)
2. Motor Shaft
6.9 Troubleshooting without Fault Display
YASKAWA ELECTRIC SIEP C710606 18F YASKAWA AC Drive – V1000 Technical Manual
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6
Troubleshooting
