Yaskawa DR2 Sigma Servo - Manual (Page 31)

2.1 Precautions
17
Always follow the specified installation method.
The Servopack generates heat. Install the Servo-
pack so that it can radiate heat freely. Note also
that the Servopack must be in an environment
free from condensation, vibration and shock.
Perform noise reduction and grounding properly.
If the signal line is noisy, vibration or malfunction
will result.
D Separate high-voltage cables from low-voltage cables.
D Use cables as short as possible.
D Use at least class 3 grounding (ground resistance
100Ω or below) for the Servomotor and Servopack.
D Never use a line filter for the power supply in the
motor circuit.
Conduct a voltage resistance test under the following conditions.
D Voltage: 1500 Vrms AC, one minute
D Braking current: 30 mA
D Frequency: 50/60 Hz
D Voltage applied point: Between L1, L2, L, N, +, -,
Y3, Y4, U, V, W terminals and ground terminal
(connect between terminals securely.)
Use a fast-response type ground-fault detector.
For a ground-fault detector, always use a fast-re-
sponse type or one designed for PWM inverters.
Do not use a time-delay type.
Do not perform continuous operation under overhanging load.
Continuous operation cannot be performed by ro-
tating the motor from the load and applying regen-
erative braking. Regenerative braking by the Ser-
vopack can be applied only for a short period,
such as the motor deceleration time.
The Servomotor cannot be operated by turning the power ON and OFF.
Frequently turning the power ON and OFF causes
the internal circuit elements to deteriorate. Always
start or stop the servomotor by using reference
pulses.
2
Provide sufficient clearance
Ambient
temperature:
0 to 55°C
10 mm
Casing
Servopack
Signal
line
Servomotor
Conduct a
voltage
resistance
test as
described on
the left.
Ground-fault detector
Fast-response
type
For PWM
inverter
Time-delay
type
GOOD POOR GOOD
Servomotor
Regenerative braking
continuously applied
Power
supply
Servopack
Starting and stopping by
turning power ON and OFF