TWERD Power Electronics MFC710/AcR User manual

TWERD Power Electronics
TWERD
®
MFC710/AcR
Regenerative frequency converter
enabling energy return to the mains
General description
Mechanical dimensions
Electrical connection diagram
Fail re codes
List of parameters
MFC710 User's Manual supplement
Edition 4.2 en
www.twerd.pl

ATTENTION:
This description of M C710 / AcR supplements the description of M C710 and includes:
• general description of the M C710 / AcR frequency converter,
• mechanical dimensions,
• electrical power circuit connection diagram,
• failure codes,
• list of additional parameters active only in the M C710 / AcR converter.
•Other information, such as:
• nominal currents values,
• operating the control panel,
• description of individual frequency converter functions,
• list of all parameters
are the same as in the M C710 frequency converter and are included in the '' requency
converter type M C710'' user's manual.
•The information contained in this MFC710 / AcR description takes precedence
over the information contained in the MFC710 man al.
•Before mechanical and electrical installation and using the M C710/AcR
regenerative frequency converter, the user is obliged to read both this description
of M C710/AcR and the manual of the M C710 frequency converter.
•The user bears the full consequences of not complying with the above
recommendations.
•In case of any doubts, please contact us. Contact details can be found on the
company website www.twerd.pl in the "contact" tab.
The terms "frequen y onverter", " onverter" and "inverter" in this des ription are used
inter hangeably.

Contents
1. General description of the M C710/AcR frequency converter.........................................................................................5
2. Mechanical dimensions..................................................................................................................................................... 6
3. Installation of the frequency converter.............................................................................................................................. 8
3.1. Connecting the power circuit....................................................................................................................................8
4. irst run............................................................................................................................................................................. 9
5. Table of M C710/AcR frequency converter parameters................................................................................................10
6. ailure codes.................................................................................................................................................................. 12
7. EU Declaration of Conformity.........................................................................................................................................14

M C710/AcR - Section: 1. General description of the M C710/AcR frequency converter
1. General description of the MFC710/AcR freq ency converter
The M C710/AcR frequency converter was developed by extending the M C710 frequency converter with an
AcR (Active Rectifier) reversible rectifier module replacing the conventional diode input circuit. This eliminates
the problems arising from the use of diode rectifiers:
• power supply current and voltage distortions caused by the non-linear load,
• no possibility of returning electricity to the mains.
ig. 1.1 shows block diagrams of both types of converters.
MFC710
Asynchro-
nous motor
AC/DC
rectifier
DC-link
circuit
DC/AC
inverter
Directions of electricity
flow
Electrical
grid C
mfc710acr-05.1-en
MFC710/AcR
C
AC/DC
rectifier
DC-link
circuit
DC/AC
inverter
Electrical
grid
Directions of electricity
flow mfc710acr-06.1-en
Asynchro-
nous motor
Fig. 1.1: Blo k diagrams of MFC710 and MFC710/A R onverters
Using the M C710/AcR converter, we obtain:
1. FC power factor correction, limitation of THDi c rrent distortion factor and THD voltage.
The AcR module allows to obtain a sinusoidal waveform of the consumed current, eliminating the
negative impact of higher harmonics introduced into the power supply network when using
conventional power supply systems.
2. Bidirectional power flow, fo r-q adrant operation.
In converter drives, there is often a situation in which the energy accumulated in the load must be
transferred back to the source or lost in the form of heat on an additional resistor. If this process is
intense or repeated often, the use of an additional braking resistor may be unprofitable or impossible.
The AcR module allows bidirectional power flow, so that it can transfer the stored energy to the
mains for recycling. Such a solution is justified not only from the point of view of the energy balance
but also from the point of view of operating costs. The module is used, among others in drive
applications for centrifuges, cranes and the processing of energy obtained from renewable sources.
3. Voltage stabilization in the intermediate circ it.
The AcR module is a three phase AC / DC boost converter. This means that the voltage in the
intermediate circuit of the inverter may be higher than the mains voltage. The use of the AcR module
in the frequency converter allows for higher voltage than the supply voltage at the inverter output
(e.g. 400VAC 50Hz input voltage, 0-500VAC 0-400Hz output voltage).
TWERD POWER ELECTRONICS 5

M C710/AcR - Section: 2. Mechanical dimensions
2. Mechanical dimensions
Assembly drawings
Dimensions of frequency converters M C 710 / AcR type.
Enclos re type A Enclos re type B Free space aro nd
the converter
It is necessary to provide some free space around the converter for appropriate air circulation.
Table 2.1: Dimensions of the MFC710/AcR 400V and MFC710 500V frequen y onverters
(replaces the table 0.3a in the MFC710 user's manual
Modification Type of a converter
Dimensions
[mm]
a A b B C d1 d2 Ø1 Ø2 φ
Weight1
[kg]
A
0,75kW
1,1kW
1,5kW
2,2kW
3kW
4kW
255 267 2x75 4) 2x114 4) 154 - - 7 7 - 6,5
5,5kW
7,5kW 322 337 2x90 4) 2x130 4) 188 - - 7 7 - 12
11kW
15kW
18,5kW
322 337 2x90 4) 2x130 4) 223 - - 7 7 - 15
B
22kW
30kW
37kW
45kW
55kW
590 615 192 256 266 10 15 8,2 8,2 15 30
75kW
90kW 838 865 190 283 400 12 15 8,5 8,5 18 60
110kW
132kW
160kW
200kW
250kW
875 920 338 460 345 15 25 13 13 22 100
315kW
355kW 875 920
940 2)
420
558 3) 640 345 15 25 13 13 22 130
400kW
450kW
500kW
1045 1090
11272) 2x317 800 345 15 25 13 13 22 200
6 TWERD Power Electronics
C
b
B
A
a
Ø1
Ø1
d1
φ
b
B
C
A
a
Ø2
d2

M C710/AcR - Section: 2. Mechanical dimensions
Table 2.1: Dimensions of the MFC710/AcR 690V frequen y onverters
(replaces the table 0.3b in the MFC710 user's manual
Modification Type of a converter
Dimensions
[mm]
a A b B C d1 d2 Ø1 Ø2 φ
Weight1
[kg]
B
45
55 Casings are hosen a ording to the individual requirements.
75 kW
90 kW 838 865 190 283 400 12 15 8,5 8,5 18 65
110 kW
132 kW
160kW
200kW
875 920 338 460 345 15 25 13 13 22 100
250kW
315kW
355kW
875 920
940 2)
420
558 3) 640 345 15 25 13 13 22 130
400kW
450kW
500kW
1045 1090
1127 2) 2x317 800 345 15 25 13 13 22 200
560kW
630kW
800kW
Cabinet onstru tion
1. Approximate weight of a frequency converter, may vary depending on its construction.
2. Height of a frequency converter increased due to due to protruding rails for power and load connection.
3. Bottom spacing of mounting holes.
4. In version A, we use two identical casings placed next to each other.
We also offer M C710 / AcR converters in a cabinet version with a selected degree of IP protection
according to individual customer requirements.
TWERD POWER ELECTRONICS 7

M C710/AcR - Section: 3. Installation of the frequency converter
3. Installation of the freq ency converter
3.1. Connecting the power circ it
The M C710 / AcR drive is typically powered by a 3x400V 50Hz three-phase network. We also offer versions
for other voltages (e.g. 3x500V, 3x690V). It should be noted that all parameters resulting from load currents
are given for the 3x400V power supply network. ig.3.1, 3.2 and 3.3 show variants of high-current
connections - depending on the converter design. These diagrams replace the diagram in fig. 2.1 in the
M C710 manual. The cable cross-sections and the type of line reactor should be selected depending on the
load current. To meet the requirements of the European Union Directive in the field of EMC electromagnetic
compatibility, a four-wire cable should be used in the screen, supplying the motor (three phases + protective
conductor).The type of line chokes and protections is available from the manufacturer's representative.
If there is a need to use contactors between the converter and the motor, care should be taken to switch the
contactor off in a voltage free state when the converter is stopped (STOP state). Otherwise, there is a risk of
damaging the converter. or more information, refer to section 2.3 of the M C710 user's manual.
mfc710acr-01.1-en
L1
L2
L3
PE
U
V
W
DI5
+24V
K11
K12
Power supply
for the
pre-charging
contactor
Confirmation of the
pre-charging contactor activation
Permission to switch on
the pre-charging contactor
PE
Power
supply
network
PE
Asynchronous
motor
K
Input filter
Pre-charging
resistors
(M C1000/113)
Transistor
input
bridge
Transistor
output
bridge
Varistor overvoltage
protection
Pre-charging
contactor
coil
L1'
L2'
L3'
MFC710/AcR
use
(gR or aR)
K - Pre-charging contactor
L1_1
(x10_2)
L1_2
(x10_1)
L2_2
(x11_2)
L2_1
(x11_1)
Fig.3.1. Ele tri al onne tion diagram of the MFC71/A R onverter - option I
mfc710acr-02.1-en
L1
L2
L3
PE
U
V
W
DI5
+24V
K11
K12
Power supply
for the
pre-charging
contactor
Confirmation of the
pre-charging contactor activation
Permission to switch on
the pre-charging contactor
PE
Power
supply
network
PE
Asynchronous
motor
K
Input filter
Transistor
input
bridge
Transistor
output
bridge
Varistor overvoltage
protection
Pre-charging
contactor
coil
L1'
L2'
L3'
MFC710/AcR
use
(gR or aR)
K - Pre-charging contactor
L11
L21
L31
Pre-
charging
resistors
Fig. 3.2: Ele tri al onne tion diagram of the MFC71/A R onverter - option II
8 TWERD Power Electronics

M C710/AcR - Section: 3. Installation of the frequency converter
L1
L2
L3
PE
U
V
W
PE
Power
supply network
PE
Asynchronous
motor
Input filter
L1'
L2'
L3'
MFC710/AcR
use
(gR lub aR)
mfc710acr-03.1-en
Fig. 3.3: Ele tri al onne tion diagram of the MFC71/A R onverter – option III
4. First r n
The first run should be preformed according to the M C710 frequency converter User Manual with the
following differences:
1. Parameter 1.62 Reg.Hi Udc should be set to 000 NO.
2. Parameter 3.57 AcR fail.Re should be set to 001 Warning or 002 Fa lt.
3. In parameter 1.104 enter the inductances of the LC or LCL filter chokes used on power grid side (line
side.
Note: When using the LCL filter, sum up the values of both indu tan es.
TWERD POWER ELECTRONICS 9

M C710/AcR - Section: 5. Table of M C710/AcR frequency converter parameters
5. Table of MFC710/AcR freq ency converter parameters
1. Group 0: Read-only parameters
Parameter Name Description
0.70 AcR I L1 Line current in phase L1 [A]
0.71 AcR I L2 Line current in phase L2 [A]
0.72 AcR I L3 Line current in phase L3 [A]
0.73 AcR Ip Active component of line current [A]
0.74 AcR Iq Reactive component of line current [A]
0.75 AcR UL Interfacial AC voltage of the supply grid powering the converter [V]
0.76 AcR Temp1 IGBT modules temperature of AcR rectifier [0C]
0.77 AcR Temp2 IGBT modules temperature of AcR rectifier [0C]
0.78 AcR f.code ailure code reported by AcR (IGBT rectifier module)
0.79 AcR version AcR software version
2. Other groups
Parameter /
Name
Function Setting range / unit Factory
setting
Change
during
operation
GROUP 1 – CONFIGURATION OF THE DRIVE
1.62 Reg.Hi.Udc DC-link voltage regulation 000 NO
001 YES
In a M C710/AcR frequency converter this parameter
must be set to 000 NO.
001 YES YES
1.100 AcR mode Active Rectifier mode 0 - AcR O
1 - AcR ON when "ready"- a)
2 - AcR ON when "run" mode - b)
3 - AcR ON when "run" mode is set b) and a motor
starts after the AcR started - c)
Power supply
START
Ready
AcR ON
a) - par. 1.100 = 1
par. 1.100 = 3
out
AcR ON
par. 1.100 = 1; 2
t
t
t
t
t
t
c)
b) - par. 1.100 = 2; 3
3 NO
1.101 Udc ref. Reference voltage Udc 500..744 V for M C710/AcR 3x 400V
500..894 V for M C710/AcR 3x 500V
500..1418 V for M C710/AcR 3 x 690V
620V
750V
1025
YES
1.102 Iq ref. Reference reactive current % -30.0...30.0% (100.0% = In) 0.0% YES
1.103 Limit AcR Line current limit
(drawn current and fed back
current)
1.0-150.0% (100.0% = In) 150.0% YES
1.104 L mains Inductance of the chokes
used in the LCL filter from the
power grid side.
0.000-32.767mH
The values read from the nameplate of the hokes on
the power grid side should be summed up.
depends on
the onverter
power
YES
1.105 kp Udc Kp and ki coefficients of the
PI voltage controller Udc
0-32767 185 YES
1.106 ki Udc 0-32767 105 YES
1.107 kp Id Kp and ki coefficients of the
PI active current controller
0-32767 100 YES
1.108 ki Id 0-32767 115 YES
1.109 kp Iq Kp and ki coefficients of the
PI reactive current controller
0-32767 100 YES
1.110 ki Iq 0-32767 115 YES
1.112 df carr.AcR Servi e parameter 0...10 0 Hz YES
10 TWERD Power Electronics

M C710/AcR - Section: 5. Table of M C710/AcR frequency converter parameters
Parameter /
Name
Function Setting range / unit Factory
setting
Change
during
operation
1.113
SYNC mode
Servi e parameter 0,1,2,3 0 YES
GROUP 2 – REFERENCING-UNITS AND CONTROL
2.113
Enable AcR
Enable active rectifier AcR Sw. Off – operation impossible
In.C1...In.C6 – enabled when there is voltage
supplied on digital input DI1...DI6
Sw.On – operation possible
Sw.On YES
GROUP 3 – FAILURES
3.57 AcR fail.Re Reaction to lack of
communication with AcR
module or failure AcR
device
000 None – ignore
001 Warning - a warning will be displayed, device
keeps working with set frequency
002 Fa lt - device will stop and message will be
displayed (type of failure is stored in par. 0.78)
In a M C710/AcR frequency converters this parameter
should be set to 001 Warning or 002 Fa lt.
000 None YES
TWERD POWER ELECTRONICS 11

M C710/AcR - Section: 6. ailure codes
6. Fail re codes
Table 6.1 – List of failure odes
Failure
codes
Displayed
name
Description Possible cause Counteraction
1 High
temperature
Too high temperature of one
of the IGBT modules of the
AcR active rectifier.
1. Hindered airflow.
2. System overload.
3. Ambient temperature is too high.
1. Check ventilation efficiency (fan
efficiency and heat sink pollution).
2. Reduce system load.
3. Ensure proper temperature at the
place of installation.
3 High voltage
Udc
High voltage in DC circuit. 1. The voltage on the mains side is
too high.
2. Intensive motor braking.
3. Too low current limit – par. 1.103.
4. Incorrect PI Udc controller
settings – par. 1.105, 1.106.
1. Check the mains.
2. Increase the braking time
(deceleration) of par. 1.31 or 1.33.
3. Increase the current limit – par.
1.103 (max. 150.0%)
4. Increase the kp Udc coefficient –
par. 1.105 (max. 400) and/or
decrease ki Udc coefficient at
parameter 1.106.
4 Low voltage
Udc
Low voltage in DC circuit. 1. Lack of one phase of the mains
voltage.
2. Mains voltage too low.
3. Precharge circuit is defective.
1. Check the cables from the mains
side.
2. Check the supply voltage level.
3. Check the precharge circuit wires.
5 Short circuit A short circuit at the system
input (from the AcR active
rectifier side) or an IGBT
module fault.
1. Incorrect connection of measuring
and/or power wires.
2. Lack of, damaged or incorrectly
connected input choke.
3. Damage to the AcR active
rectifier IGBT module.
1. Check the correctness of the
connections and the condition of
the measuring and power wires.
2. Check the choke and the
correctness of its connection.
3. Contact the Service.
10 DC charging Pre-charging DC-link error. 1. Damage to the pre-charging
contactor or the pre-charging
control system.
1. Check the connections (wires,
plugs) of the precharge circuit.
11 Absence of
temp. sensor
Lack of signal from the IGBT
module temperature sensor.
1. Unplugged sensor plug.
2. Damage to the sensor or
connecting wires.
1. Check the connections (wire,
plugs) of the temperature
measuring circuit.
2. Contact the Service.
12 Short circuit of
temperature
sensor
Incorrect signal from the
IGBT module temperature
sensor.
1. Damage to the sensor or
connecting wires.
1. Check the connections (wire,
plugs) of the temperature
measuring circuit.
13 Low
temperature
The temperature is too low
(below -100C) of one of the
AcR active rectifier IGBT
modules.
1. The ambient temperature is too
low.
1. Ensure proper temperature at the
place of installation.
14 Mains fault Incorrect mains parameters.
1. The value of the supply voltage
(RMS) or its frequency is outside
the permissible range.
1a. Check the mains parameters.
1b. If the mains is unstable, wait until
the parameters return to the
correct values.
1c. If possible, connect the system to
another power supply.
16 High current
(software)
Exceeding the permissible
current value (3 x In) from
the mains side - software
protection.
1. Incorrect setting of parameter
1.104 (due to e. g. changing the
choke without entering in the par.
1.104 new value of its
inductance).
2. Incorrect settings of the Id or Iq
current regulator (parameters:
1.107 ÷ 1.110).
3. Too intensive starting of the
motor or rapid change of its load.
4. Sudden voltage drop in the
mains.
5. Damaged capacitor in the LCL
input filter or incorrect connection
of the LCL filter.
1. Check the setting of par. 1.104
with inductance of the chokes from
the mains side.
2. Change the current regulator Id or
Iq setting in par. 1.107 ÷ 1.110
(default value = 115%)
3. Increase motor start time.
4. Wait until the mains parameters
return to the correct values. When
possible, connect the system to
another power supply.
5. Check that the capacitors have no
leaks or are not swollen. Check the
correctness of LCL filter
connections.
17 Phase missing One or two phases are
missing from the mains side.
1. One or two phases are missing
from the mains side.
2. Incorrect connection of the
frequency converter to the mains.
1. Ensure correct mains supply
values.
2. Check the correctness of
connections from the mains side.
12 TWERD Power Electronics

M C710/AcR - Section: 6. ailure codes
Failure
codes
Displayed
name
Description Possible cause Counteraction
18 Udc error in
three-level
topology
Too high Udc voltage
imbalance ½ in the
intermediate circuit.
1. Break in the gate signal circuit.
2. Damaged IGBT transistor.
3. Damaged Udc intermediate circuit
capacitors.
1. Make sure all plugs are firmly
seated in the sockets.
2. Contact with service.
3. Contact with service.
19 Saturation of
the current
controller
The current controller has
reached the limit
1. The mains voltage is
disconnected.
2. Incorrect mains power supply
values.
3. In parameter 1.101 the Udc
intermediate circuit voltage is set
too low.
1. Check the voltage at the terminals
from the mains side.
2. Check the voltage value at the
terminals from the mains side.
3. Increase the value of parameter
1.101 "Udc ref." incrementally by 10
V until the failure is eliminated.
Note: Do not ex eed 700V (for
3x400V supply voltage).
22 External fault External fault input active. Check the status at the digital input
selected as an external fault.
26 High current
(hardware)
Exceeding the permissible
current value (3 x In) from
the mains side – hardware
protection.
1. Incorrect setting of parameter
1.104 (due to e. g. changing the
choke without entering in the par.
1.104 new value of its
inductance).
2. Incorrect settings of the Id or Iq
current regulator (parameters:
1.107 ÷ 1.110).
3. Too intensive starting of the
motor or rapid change of its load.
4. Sudden voltage drop in the
mains.
5. Damaged capacitor in the LCL
input filter or incorrect connection
of the LCL filter.
1. Check the setting of par. 1.104
with inductance of the chokes from
the mains side.
2. Change the current regulator Id or
Iq setting in par. 1.107 ÷ 1.110
(default value = 115%)
3. Increase motor start time.
4. . Wait until the mains parameters
return to the correct values. When
possible, connect the system to
another power supply.
5. Check that the capacitors have no
leaks or are not swollen. Check the
correctness of LCL filter
connections.
27 Time out Communication error
between internal converter
control boards.
1. External interference.
2. Damaged wire connecting control
boards.
3. Damage to one of the control
boards.
Contact Service.
28 Sync Error The system cannot
synchronize with the mains.
1. Lack of one phase of the power
supply network.
2. Precharge circuit is defective.
3. Incorrect mains frequency.
1. Check the correctness of
connections from the mains side.
2. Check the precharge circuit.
3. Ensure that the mains frequency is
correct.
If the fa lt cannot be removed, please contact the service centre. The phone n mber can be fo nd at
www.twerd.pl.
dtr-mf 710-A R-en_v4.2 / 2020/07/03
TWERD POWER ELECTRONICS 13

M C710/AcR - Section: 7. EU Declaration of Conformity
7. EU Declaration of Conformity
14 TWERD Power Electronics

M C710/AcR - Section: 7. EU Declaration of Conformity
TWERD POWER ELECTRONICS 15

Zakład Energoelektroniki TWERD sp. z o.o.
28-30 Aleksandrowska
Toruń, 87-100, PL
tel./fax: [phone]
e-mail: [email protected]
www.twerd.pl
SCALONE IGURY