Watt Drive L2000 Series, Руководство пользователя, Страница: 13 / 52

Safety precautions
Page 13 / 52
CAUTION Be sure to ground the grounding terminal properly.
CAUTION Before inspecting the unit wait at least five minutes before opening the inverter
.
CAUTION PROTECTION AGAINST NOISE INTERFERENCE FROM THE INVERTER
L2000 series inverters use many semiconductor switching elements such as
transistors and IGBTs. For this reason, a radio set or measuring instrument
located near the inverter is susceptible to noise interference. To protect the
instruments from erreneous operation due to noise interference produced by
the inverter, they should be installed well apart from the inverter. It is also
effective to shield the whole inverter structure (refer to figure below, left part).
Motor
Inverter
L1(L1)
L2
L3(N)
T1(U)
T2(V)
T3(W)
R2
S2
T2
Pow
er
su
pp
ly
R1
S1
T1
EMI filter
Grounding
In
ve
rt
er
EM
I
filte
r
Remote
operator
Motor
Pow
er
su
pp
ly
Noise
Noise
Grounded
frame
Completely ground the frame
with as short a wire as possible.
Grounded piping
or shielded wire
Addition of an EMI filter on the input side of the inverter also reduces the effect
of noise from commercial power lines on external devices (refer to figure
above).
CAUTION EFFECTS OF DISTRIBUTER LINES ON INVERTERS
In the cases mentioned below involving a general purpose inverter, a large
peak current flows on the power supply side, sometimes destroying the
converter module:
A) The unbalance factor of the power supply is 3% or higher.
B) The power supply capacity is set at least ten times greater than the
inverter capacity (i.e. 500kVA or more)
C) When abrupt power supply changes are to be expected. Some examples:
1) Several inverters are interconnected using a short bus to the same
power supply.
2) A thyristor converter and an inverter are interconnected using a short
bus.
3) An installed power factor compensating device is connected or
disconnected.
In the cases mentioned above we recommend installing an AC reactor of 3%
voltage drop at rated current with respect to the supply voltage on the power
supply side.
CAUTION When an EEPROM error occurs (trip E 08 ) all parameter values have to be
checked for correctness (especially the RS input).
CAUTION When the intelligent digital inputs FW or RV are configured as normally closed
contact (standard setting is normally open), then the inverter starts
automatically. Do not configure these inputs as normally closed inputs unless
absolutely necessary.
GENERAL NOTICE
In all the illustrations and figures in this manual, covers and safety devices are
occasionally omitted in order to better describe the details. When the inverter is
operated make shure that all the covers and safety devices are placed in their correct
positions.