IS620P User Manual Chapter 3 Wiring of Servo System
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1KM: electromagnetic contactor; 1RY: relay; 1D: bypass diode
Connect the main circuit power supply according to the preceding two îš¿gures.
DOs (ALM+/-) are set as fault output. Power supply is automatically cut off when the servo
drive reports an error. Meanwhile, the fault indicator goes ON.
Observe the following precautions when wiring the main circuit:
1. Do not connect the input power cables to the output terminals U, V and W. Failure to
comply will cause damage to the servo drive.
2. When cables are bundled together in a duct, take current reduction into consideration
since the cooling condition becomes poor.
3. Common cables become quickly aged in high temperature environment and easily sclerotic
and broken in low temperature environment. Thus, use high-temperature cables in high
temperature environment and take thermal measures in low temperature environment.
4. The bending radius of a cable shall exceed 10 times that of its outer diameter to prevent
the internal wire core from breaking due to long time bending.
5. Select and use cables with withstand voltage of 600 VAC (and above) and temperature
of 75°C (and above). Under the ambient temperature of 30°C and with normal cooling
conditions, the allowable current density of the cables shall not exceed 8 A/mm
2
when the
total current is below 50 A, or 5 A/mm
2
when the total current is above 50 A. This value
shall be adjusted when the ambient temperature is high or when the cables are bundled.
The allowable current density (A/mm
2
) can be calculated as below:
Allowable current density = 8 x Current reduction coefîš¿cient of conductor x Current
augmenting coefîš¿cient
Current augmenting coefficient = (Max. allowable temperature of cable - Ambient temperature)/ 30
Table 3-6 Current reduction coefîš¿cient of
conductor
No. of Cables in
the Same Duct
Current Reduction
Coefîš¿cient
≤ 3 0.7
4 0.63
5 to 6 0.56
7 to 15 0.49
6. The regen resistor cannot be connected between terminals
and . Failure to comply
may cause a îš¿re.
7. Do not bundle power cables and signal cables together or run them through the same
duct. Power and signal cables shall be separated by at least 30 cm to prevent interference.
8. Hazardous voltage may still remain in the servo drive when the power supply is cut off. Do
not touch the power terminals within 5 minutes after power-off.
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