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Fuji Electric has recently developed a special inverter for HVAC and pump
applications named Frenic Eco.
The capacity range of Frenic Eco is from 0,75 kW to 110 kW for 3 phase
200 V supply and 0,75 kW to 560 kW for 3 phase 400 V supply, in IP20/IP00
protection degree. Also there is an IP54 version, with a capacity range
from 0.75 kW to 90 kW for 3 phase 400 V supply. The overload capability
for all the range is 120 % of the rated current for 1 minute.
Frenic Eco can be set up for constant torque or variable torque applications.
It includes a full set of functions dedicated to HVAC and pump applications:
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Line/Inverter switching. With this
function the inverter is able to handle by itself the sequence of
changing the supply of the motor from the inverter to the mains.
This sequence can be activated using a digital input or can be programmed
to enter automatically when an alarm occurs in the inverter.
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- PID control block. The inverter
has a complete PID control block with some advanced functions as: |
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- Anti-reset wind-up function.The integration can be programmed
to be active only when the error between the set point and the
process feedback is lower than the value programmed in the function.
This avoids big overshoots of the control system
- Slow flow rate stop function. The inverter will stop the
motor when the output frequency is under a threshold value programmed
in a function.
- Alarm output (deviation or absolute value). A digital output
can be programmed to be active when the deviation (error) between
the set point and the process feedback is greater than the value
programmed in the function.
- Integration Hold/Reset function. The integration can be hold
or reset, by using digital inputs of the inverter.
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Low output torque detection function.
With this function the inverter is able to detect an abnormal sudden
change of the load torque. For example, this function can be used
to detect that the transmission belt of a fan is broken.
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Search speed function. The inverter
is able to start controlling a motor that is already turning by
external forces (for example a fan that turns by convection), avoiding
failures as over current or over voltage.
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Command loss detection function.
The inverter can detect that the speed set point has been reduced
to a very low value in a very short time (less than 400 ms); if
this occurs the inverter will activate a digital output to indicate
this situation and continue to RUN at a specified speed.
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Overload avoidance function. The
inverter is able to detect that its internal temperature is near
the overheat limit; if this happens it will automatically reduce
the output frequency (output power) to reduce the temperature of
the inverter.
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Automatic energy saving function.
Included as a standard feature is a new, automatic energy-saving
function, which controls the system so as to minimize the total
loss (motor loss plus inverter loss), rather than just the motor
loss as in the predecessor models. This feature thus contributes
to further saving of energy in applications with fans and pumps. |
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Multi Pump control. With this function
the inverter can control more than one pump. There are two types
of control: floating inverter-driven control or fixed inverter-driven
control. In the first one all pumps are supplied by the inverter
(when the first one reaches the maximum speed it is switched to
the mains supply and then the second is started with the inverter);
in this case the maximum number of pumps that can be controlled
is 3. In the second type only one pump is always supplied by the
inverter and the others are supplied directly from the mains; in
this case the maximum number of pumps is 5.
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Frenic Eco includes as a standard 7 digital inputs,
3 transistor digital outputs and 2 relay transistor outputs. 3 relay
outputs can be added, by using an option board (OPC-E1-RY). Regarding
analog signal points, the inverter has 3 analog inputs ( 10 V, 4-20
mA, 0-10 V) and two analog outputs (0-10 V, 4-20 mA).
The inverter includes as a standard one RS485 port. A second serial
port can be added with an option board (OPC-E1-RS); this second
serial port is provided with two connectors that allow an easy T-branch
connection.
The inverter is supplied as standard with a LED keypad (TP-E1).
This keypad allows to set up all the functions and to monitor
the status of the inverter. Also this keypad can save the complete
parameter set of one inverter. This keypad can be remotely connected
by using a standard LAN cable. As an option there is a LCD keypad
(TP-G1) that shows the information in text format. This keypad
can save the complete parameter set of 3 inverters. Also with
this keypad a menu 0 (easy menu) can be defined.
Fieldbus options are already available for DeviceNet (OPC-F1-DEV),
ProfiBus (OPC-F1-PDP) and LonWorks (OPC-F1-LNW). These options
are cost competitive and easy to install inside the body of the
inverter.
Regarding EMC compatibility, Frenic Eco fulfils the directive
EN61800-3:2004..
The harmonic content of the input current can be reduced by using
a DC reactor, which is standard for capacities of 75 kW and above.
The DC reactor also reduces the value of the input current, therefore
reducing the installation costs.
Like other products from Fuji Electric, Frenic Eco gives a complete
maintenance information: the information of the last 4 alarms
is saved in the inverter memory (code of the alarm, output frequency,
output voltage, output current, digital inputs and outputs status,..);
also the cumulative running time of the inverter fan, cumulative
running of the inverter and the actual capacity of the main DC
link capacitors is stored inside the inverter. This information
can be very useful to take preventive maintenance actions.
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Frenic
Eco
