Leroy-Somer FMV 2107, Руководство по установке и обслуживанию

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Frequency inverters
FMV 2107
FMV 2307
6 - MAINTENANCE
6.1 - Introduction and advice
Caution
The power board printed circuit (lower circuit) is
connected directly to the mains.
Do not perform any operations on the
inverter without first manually opening the supply
circuit of the power stages (fused isolator or circuit-
breaker) or opening the KM input contactor
and manually locking (key) the remote control of KM.
Note also that the smoothing capacitor can be subjected
to very high voltages. Do not touch the inverter terminals
without first performing or checking one of the following
three operations.
a ) - After switching the power off to the inverter, wait
5 minutes for the capacitors to discharge.
b ) - Use a voltmeter to check that the voltage on the
D.C. bus is less than 15 volts.
c ) - Should it not be possible to perform the
above operations due to lack of time, place a discharge
resistor (30 W-500
Ω
) very carefully (High voltage !!!) on
the D.C. bus terminals for at least 15 seconds.
FMV 2107 - FMV 2307 inverters require a minimum of
maintenance and repair operations on the part of the
user. Detailed below are normal maintenance operations
and simple methods for checking that the inverter
is operating correctly and for making an initial diagnosis
of correct operation on the power stages.
6.2 - Care
For the inverter, it is important to bear in mind that all
electronic equipment may be subject to problems after
being exposed to excessive heat, humidity, oil, dust, or if
any external matter is allowed to penetrate.
Clean the motor ventilation holes from time to time and
follow any lubricating instructions for the bearings as
indicated on the name plate.
Printed circuits and their components do not normally
require any maintenance. Contact your retailer or
nearest approved service centre if any problems occur.
DO NOT REMOVE PRINTED CIRCUIT BOARDS
DURING THE GUARANTEE PERIOD, AS THIS
WILL IMMEDIATELY RENDER IT NULL AND VOID.
Do not touch integrated circuits or the microprocessor
with your fingers or with any charged or live material.
Earth yourself, as well as the bench or soldering iron
before any intervention on the circuits.
Do not handle the socket-mounted integrated circuits
located on the printed control circuit (risk of damage).
6.3 - Measuring voltage, current and power
6.3.1 - Measuring the voltage at the inverter output
The harmonics from the inverter mean that it is not
possible to measure the voltage at the motor input
correctly with an ordinary voltmeter. However, you can
obtain an approximate value of the rms voltage of the
fundamental wave (which has a bearing on the torque)
by using a standard voltmeter and the arrangement
described in the section below.
6.3.2 - Measuring the motor current
The current drawn by the motor and the inverter input
current can be measured approximately using an
ordinary moving coil ammeter.
6.3.3 - Measuring the inverter input and output power
The inverter input and output power can be measured
using an electro-dynamic instrument.
6.4 - Testing the inverter power stages
6.4.1 - Preliminary remarks :
The tests described below are intended to perform a
qualitative test of the state of the power stages. Use an
analogue ohmmeter (moving coil) set to the 1
Ω
scale
and take measurements after switching off the
inverter and waiting for the smoothing capacitor to
discharge completely. Each measurement must last for
at least 10 seconds to avoid false readings from any
charge which might still be present in the inverter
circuits. If there is any doubt about the power stages,
make a visual check of the state of the gate drive
modules which may have been damaged subsequently.
The following diagrams represent the general
schematic diagram of the transistor inverter stage in
the speed controller.
- FMV 2107
FMV
3
MOTOR
U
V
W
C : capacitor 0.1µF
400 VAC (1000V peak).
R : resistance 1 k , 5W.
V : A.C. voltmeter
impedance > 1000 /V.
FMV
2307
FMV
2107
C
V
R
Ω
Ω
T1 T2 T3
T4 T5 T6
U
V
W
+
–
+
-
L
N