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Servo Driver Errors
Note 2. The regeneration is calculated from the terminal voltage of the External Regeneration Resis-
tor. The External Regeneration Resistor must withstand regeneration that is three to five
times larger than the regeneration calculated from the following.
Terminal volt-
age of External
Regeneration
Resistor (V)
Main Circuit Voltage Drop
• An alarm will go off if the voltage imposed on the main circuitry of the Servo Driver is less than the allow-
able range.
• The voltage imposed on the main circuitry will be less than the allowable range if the power supply voltage
is too low or insufficient power is supplied to the main circuitry due to phase interruption.
• This alarm is also called the momentary power failure alarm or phase interruption alarm.
Alarm Indication
U Series: A. F3
H Series: E23
M Series: A. L-3
R Series: OC
Probable cause
Abnormal power supply voltage.
Phase interruption of 3-phase
power supply
The fuse was blown out or the
rectifier was damaged.
Regeneration (W)
R: Resistance of External Regeneration Resistor (Ω)
Times (s)
Item to check
• The power lines are discon-
nected.
• The power supply voltage is not
within the allowable range.
* Check the rating.
• The voltage between either one
of the combinations of these ter-
minals is 200 VAC.
R-S, R-T
* Applicable to the Servo Driver
with 3-phase, 200-V input.
• The fuse was blown out.
* Check the fuse visually or with
a multimeter.
• The resistance between each
combination of these terminals is
∞.
P (PA) - R, P (PA) - S, P (PA) - T
N (NA) - R, N (NA) - S, N (NA) - T
* Check the resistance twice by
interchanging the probes of the
multimeter. If each resistance
reading is ∞, the transistor is
damaged.
Regeneration time
(380)
2
+ a
R
b
Total operation time
Countermeasure
• Connect the power lines correct-
ly.
• Apply voltage that is within the
allowable range.
• Connect the power lines correct-
ly.
• Replace the Servo Driver after
making sure that there is no
overcurrent flow to the main cir-
cuit.
Chapter 3
3-5
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