Instruction manual

21
2
INSTALLATION AND WIRING
6) Connect only the recommended optional brake resistor between the terminals P-PR
(+ - PR).
These terminals must not be shorted.
Also, never short these terminals.
7) 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 FR-BSF01 or FR-BLF line noise filter to minimize
interference.
8) Do not install a power capacitor, surge suppressor or capacitor type filter on 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 installed, immediately remove them.
9) When rewiring after operation, make sure that the POWER lamp has gone off, and
when more than 10 minutes has elapsed after power-off, check with a meter etc. that
the voltage is zero. After that, start rewiring work. For some time after power-off, there
is a dangerous voltage in the capacitor.
Notes on Grounding
 Leakage currents flow in the inverter. To prevent an electric shock, the inverter and
motor must be grounded. Grounding must conform to the requirements of national
and local safety regulations and electrical codes.
(JIS, NEC section 250, IEC 536 class 1 and other applicable standards)
 Use the dedicated ground terminal to ground the inverter. (Do not use the screw in
the case, chassis, etc.) For the ground connection, avoid direct contact between
aluminium and copper. Tin-plated cable lugs can be used if the plating does not
contain zinc. When tightening the screws, take care not to damage the thread in
the aluminium frame.
 Use the thickest possible ground cable. Use the cable whose size is equal to or
greater than that indicated below, and minimize the cable length. The grounding
point should be as near as possible to the inverter.
 Ground the motor on the inverter side using one wire of the 4-core cable.
(Unit: mm
2
)
Motor Capacity Ground Cable Gauge
3.7kW (5HP) or less 3.5
5.5kW (7.5HP), 7.5kW (10HP) 5.5
M4500E.book 21 ページ ２００５年２月２２日 火曜日 午後５時７分