YASKAWA V1000 Series Installation & Start-Up Manual page 233

LED Operator Display
Cause
Overshoot or undershoot is
occurring.
PG pulse settings are incorrect.
Parameter settings are inappropriate.
LED Operator Display
Cause
Surge voltage is present in the drive
input power.
• The motor has short-circuited.
• Ground current has over-charged
the main circuit capacitors via the
drive input power.
Noise interference causes the drive to
operate incorrectly.
YASKAWA TM.V1000.01 V1000 Drive Installation & Start-Up Manual (Preliminary 01-19-07)
Overspeed (for Simple V/f with PG)
oS
Pulse input (RP) indicates that the motor speed feedback exceeded the setting
in F1-08.
• Adjust the gain by using the pulse train input parameters
(H6-02 through H6-05).
Adjust the speed feedback accuracy.
• Increase the settings for C5-01 (Speed Control
Proportional Gain 1) and reduce C5-02 (Speed Control
Integral Time 1).
Set the H6-02 (Pulse Train Input Scaling) = 100%, the
number of pulses during maximum motor revolutions.
Check the setting for the overspeed detection level and the
overspeed detection time (F1-08 and F1-09).
DC Bus Overvoltage
The DC bus voltage exceeded the trip point.
ov
For 200 V class: approximately 410 V
For 400 V class: approximately 820 V (740 V when E1-01 < 400)
• Install a DC reactor or an AC reactor.
• Voltage surge can result from a thyristor convertor and a
phase advancing capacitor operating on the same drive
input power system.
• Check the motor power cable, relay terminals and motor
terminal box for short circuits.
• Correct grounding shorts and turn the power back on.
• Review the possible solutions provided for handling noise
interference.
• Review the section on handling noise interference and
check the control circuit lines, main circuit lines and
ground wiring.
• If the magnetic contactor is identified as a source of noise,
install a surge protector to the MC coil.
Set the number of fault restarts (L5-01) to a value other
than 0.
5.6 Alarm Detection
Minor Fault Name
Possible Solutions
Minor Fault Name
Possible Solutions
Minor Fault
Output
(H2- = 10)
YES
YES
YES
5
Minor Fault
Output
(H2- = 10)
YES
YES
YES
YES
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