First, scene condition
1st, this elevator is 155KW 绕线the type asynchronous
motor, uses the string resistance to divide five sections fast to fall
presses the starting and the velocity modulation. The electrical
energy waste is enormous.
2nd, this elevator uses for to pull the coal and the gangue, the
time assignment basically is 95% pulls the coal, 5% time pull the
gangue. This equipment work is 3 class of systems, each class's
average operating time is 6 hours, every day equally works for 18
hours. Considered the electrical machinery power big, the
direct-on starting electric current is big, has the extremely big
impact to the electrical network, the electrical machinery uses the
string 8 levels of resistances to fall presses the starting, then
casts off the resistance one by one, achieves the rated speed.
Stops when goes in the resistance string, the realization
decelerates stops. This kind of string resistance fell presses
the starting the method although to reduce in the certain degree to
the electrical network the impact, but because the voltage and assumes
the steps and ladders rise, or had the certain impact to the
electrical network, the starting electric current although than the
direct-on starting electric current to have to be small, but the
electrical energy which consumed in the resistance wastes in vain.
Because the electrical machinery is 绕线the type electrical
machinery, greatly surpasses in the routine maintenance quantity
ordinary three-phase asynchronous electrically operated, brings
inconveniently to the production, directly affects the output, suffers
the nonessential loss. Therefore, the electrical system
transformation appears extremely importantly.
3rd, recent years, our country electric power electron
development extremely swift and violent, the frequency conversion
technology development is specially more prominent, has made the
direct contribution for our country automaticity and the energy
conservation transformation project. Looked from this system
each kind of condition that, this system transformation extremely will
be simple, so long as will short-circuit the rotor, will be a
three-phase asynchronous motor, will be allowed to carry on the
transformation using the frequency changer.
Second, frequency conversion transformation plan
1st, the maintenance original control system is
invariable, in order to time breakdown spare, increases a
KV2000-G1600-4T frequency conversion velometer.
2nd, the rotor the contact device which meets with outside
短接, casts off the starting resistance, took the three-phase
asynchronous machine uses.
3rd, uses the frequency changer own multistage fast function,
realizes five sections of fast movements.
4th, uses the frequency changer each kind of function
realization original system function.
After third, carries on the system the frequency
conversion velocity modulation transformation, will overcome when the
original operating mode will appear each kind of not good condition:
1st, the electrical machinery starting and stops, does not
need the string resistance to start and to stop may realize 软起?
and the initial firing current control doubles in nominal current 1~2,
to electrical network any impact, has not saved the consumption in
time the resistance electrical energy and the starting surge current,
the realization energy conservation.
2nd, the rotor 短接, reduces the maintenance quantity, thus
the enhancement production output, reduces the service cost.
3rd, enhances the power factor, the power factor nearly achieves
1.0.
4th, because the frequency changer belongs to the high tech
product, therefore protection function formidable, moreover is keen,
to appears each kind of breakdown prompt protection, exempts a bigger
loss.
Fourth, product characteristic:
The KV2000 series frequency changer is applies the non-
feeling vector technology, the control output voltage and the
frequency changes the exchange asynchronous motor running rate one
kind of electric power switch. Only depends on the electric
current sensor, precisely examines the three-phase output exchange
signal and the phase angle change, by the non- feeling vector
computing mode, automatically revises the frequency, achieves when the
load fluctuation electric motor rotational speed fixed effect.
1st, in constructed the parameter autotune function, but the
automatic detection electrical machinery characteristic and
automatically establishes its related parameter, guaranteed the
frequency changer to change in the situation in the electrical
machinery movement parameter still to be able as necessary to continue
to optimize the electrical machinery movement characteristic, obtained
the biggest torque output.
2nd, entire domain protection function: The low voltage,
过电? the electric current, had prevented the electrical
machinery loses speed, the overload, protection and so on heat.
3rd, the standard V/F pattern, the non- feeling vector pattern,
the output (torque) controls the pattern.
4th, specially for industry machine design control function:
Six multi-purpose programmable digital inputs function (99 kind
of merit prefer to choose), three multi-purpose programmable digital
outputs function (94 kind of merit to prefer to choose), the
timer/counter, the rotational speed tracing function, the pro and con
function, the automatic movement function, in to set at the standard
RS485 communication connection, may let Shan Taihuo at the same time
many frequency changers make the dynamic control by the host computer,
and may simultaneously control reaches 99 frequency changers (to
surpass 31 to have to install relay amplifier), in sets at the rich
PID function. The output frequency is 0.00 ~ 650.00Hz.
5th, craft advanced, structure compact, the product contour
artistic is natural.
Fifth, concluding remark
Along with society's progress, the technical
development, the energy has become the production cost the important
constituent, some will be old the system which, will consume energy by
the high tech product substitution. The promotion production
automaticity, saves the energy, reduces the cost, has become the
enterprise to promote one of own competitive ability important ways.
Therefore, we extremely have the electrical energy which the
necessity will waste to save, will be beneficial to oneself, also will
be beneficial to the national.
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