YASKAWA USAREM-A5A Bulletin page 56

Lighting Condition
LED Detection
A / D Goes ON when power is supplied t o
b•
error the control circuit
_ CPU Goes ON during operation
— error
The motor does not rotate, and 1 4
•
and ; b l i n k alternately when the
s.
servo power is turned ON
Blink alternately after the motor rotates
momentarily at starting or during op-
Overrun
preven- eration
F r 2 .
tion
• Blink alternately after the motor
rotates momentarily at starting
Li,
• Blink alternately during operation
' The LED I M displays one of three type indications according to the trouble conditions
These displays will blink alternately between r 7 and M , E l o r E
1 2 2 2 E x a m p l e s o f T r o u b l e s h o o t i n g f o r D e f e c t i v e W i r i n g o r P a r t s
Ta b l e 1 2 3 E x a m p l e o f T r o u b l e s h o o t i n g f o r D e f e c t i v e W i r i n g o r P a r t s
Trouble
MCCB trips immediately after Power
ON and Servo ON
The reference is input, b u t the m o t o r
does n o t r u n
1 2 2 3 E x a m p l e s o f T r o u b l e s h o o t i n g f o r I n c o m p l e t e A d j u s t m e n t
Ta b l e 1 2 4 E x a m p l e s o f T r o u b l e s h o o t i n g f o r I n c o m p l e t e A d j u s t m e n t
Trouble
Motor rotates even if the speed refer-
ence voltage is 0 V
Motor vibrates o r vibration frequency is
too high. approx 2 0 0 to 3 0 0 Hz
(When vibration frequency equals
commercial f r e q u e n c y )
Motor speed overshoot is t o o large at
starting o r stopping
Ta b l e 1 2 2 L E D I n d i c a t i o n f o r Tr o u b l e s h o o t i n g ( C o n t ' d )
• Defective control circuit board
(1 P W B )
• Faulty internal elements
• Defective internal elements
• Encoder cables are broken
• Contact fault of connector or de-
fective encoder
• Wrong combination of motor and
Servopack
• Disconnection, contact fault, con-
nection error, defective encoder
• Wiring error
Check Items
• Main circuit wiring (such as motor
grounding)
• Voltage across ® , a n d 0
• Trouble LED OFF
• Speed reference voltage
• P -CON, N -OT, P -OT, S-ON signal
Cause
Incomplete ZERO potentiometer adjust-
ment
Speed loop gain too high
• Excessively long lead of SERVOPACK
input circuit
• Noise interference due to b u n d l i n g o f
signal line and power line
• Speed loop gain too high
— 4 9 —
Probable Cause
• Replace the SERVOPACK
• Resume after reset operation
• Replace the SERVOPACK
• Replace the cable
• Check the signal in phases U, V,
• Check and correct the combina-
• Check and correct pulses in phase:
• Correct the connection
• Correct the wiring
• Contact your YASKAWA represen-
—
• Correct the wiring
• Check the A C power supply circuit
• If LEDs are ON, check the cause
• Adjust the speed setting
potentiometer (supplied by
the user)
Adjust V R 3 Z E R O correctly
Turn VR6 L O O P C W to increase the
speed loop gain
• Decrease length of lead
• Separate input circuit line from power
line or connect input circuit to low
impedance less than several 1 0 0
ohms
• Turn V R 6 LLOOPI CW to increase the
speed loop gain
Corrective Action
and W
tion
A, B, U, V, and W
tative
Corrective Action
Corrective Action