MITSUBISHI ELECTRIC FR-S520 - Manual (Page 21)

12
Wiring length
100m (328.08feet) maximum. (50m (164.04feet) maximum for the FR-S540-0.4K.)
CAUTION
•
When the wiring length of the 0.1K or 0.2K is 30m (98.43feet) or more, use the
carrier frequency to 1kHz.
•
Use the carrier frequency of 1kHz when the wiring length of the FR-S540-0.4K,
0.75K is 30m (98.43feet) or more.
•
The wiring length should be 30m (98.43feet) maximum when automatic torque
boost is selected in Pr. 98 "automatic torque boost selection (motor capacity)".
(Refer to page 109)
1
.5.2 Wiring instructions
1) Use insulation-sleeved crimping terminals for the power supply and motor cables.
2) Application of power to the output terminals (U, V, W) of the inverter will damage
the inverter. Never perform such wiring.
3) After wiring, wire off-cuts must not be left in the inverter.
Wire off-cuts can cause an alarm, failure or malfunction. Always keep the inverter
clean.
When drilling a control box etc., take care not to let wire off-cuts enter the inverter.
4) Use cables of the recommended size to make a voltage drop 2% maximum.
If the wiring distance is long between the inverter and motor, a main circuit cable
voltage drop will cause the motor torque to decrease especially at the output of a
low frequency.
5) For long distance wiring, the fast-response current limit function may be reduced or
the devices connected to the secondary side may malfunction or become faulty
under the influence of a charging current due to the stray capacity of wiring.
Therefore, note the maximum overall wiring length.
6) Electromagnetic wave interference
The input/output (main circuit) of the inverter includes harmonic components, which
may interfere with the communication devices (such as AM radios) used near the
inverter. In this case, install the optional FR-BIF radio noise filter (for use in the
input side only) or FR-BSF01 or FR-BLF line noise filter to minimize interference.
7) Do not install a power capacitor, surge suppressor or radio noise filter (FR-BIF
option) in the output side of the inverter.
This will cause the inverter to trip or the capacitor and surge suppressor to be
damaged. If any of the above devices are connected, remove them. (When using
the FR-BIF radio noise filter with a single-phase power supply, connect it to the
input side of the inverter after isolating the T <L
3
> phase securely.)
8) Before starting rewiring or other work after performing operation once, check the
voltage with a meter etc. more than 10 minutes after power-off. For some time after
power-off, there is a dangerous voltage in the capacitor.