INVT RBU100H User manual

RBU100H
Regenerative Energy Unit

RBU100H operation manual Contents
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Contents
Contents......................................................................................................................................... i
1 Safety precautions..................................................................................................................... 1
1.1 Safety definition................................................................................................................1
1.2 Warning symbols..............................................................................................................1
1.3 Safety guidelines..............................................................................................................1
2 Inspection................................................................................................................................... 4
2.1 Unpacking inspection .......................................................................................................4
2.2 Application confirmation....................................................................................................4
2.3 Installation confirmation....................................................................................................4
3 Product overview....................................................................................................................... 6
3.1 Comprehensive features ..................................................................................................6
3.2 Product name and model .................................................................................................6
3.3 Rated specifications.........................................................................................................7
4 Installation guidelines................................................................................................................ 8
4.1 Installation environment....................................................................................................8
4.2 Installation direction..........................................................................................................9
4.3 Installation steps...............................................................................................................9
4.4 Terminals and function....................................................................................................11
4.5 Standard wiring ..............................................................................................................12
4.6 Parallel connection.........................................................................................................13
5 Keypad operation......................................................................................................................16
5.1 Keypad...........................................................................................................................16
6 Function parameters.................................................................................................................18
6.1 Function code ................................................................................................................18
6.2 Detailed function ............................................................................................................21
7 Fault tracking............................................................................................................................22
8 Maintenance and hardware diagnostics..................................................................................24
8.1 Maintenance interval......................................................................................................24
8.2 Cooling fan.....................................................................................................................26
8.3 Capacitors......................................................................................................................26
8.4 Power cables .................................................................................................................28
9 Dimension and size ..................................................................................................................29
9.1 Dimension of the keypad................................................................................................29
9.2 External dimension and weight of RBU...........................................................................30

RBU100H operation manual 1 Safety precautions
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1 Safety precautions
1.1 Safety definition
Danger:
Serious physical injury or even death may occur if not follow
relevant requirements
Warning:
Physical injury or damage to the devices may occur if not follow
relevant requirements
Note:
Physical hurt may occur if not follow relevant requirements
Qualified
electricians:
People working on the device should take part in professional
electrical and safety training, receive the certification and be
familiar with all steps and requirements of installing,
commissioning, operating and maintaining the device to avoid any
emergency.
1.2 Warning symbols
Warnings caution you about conditions which can result in serious injury or death, damage to the
equipment and advice on how to avoid the danger. Following warning symbols are used in this
manual:
Symbol
Name
Description
Abbreviation
Danger
Danger
Serious physical injury or even death
may occur if not follow the relative
requirements
Warning
Warning
Physical injury or damage to the
devices may occur if not follow the
relative requirements
Note
Note
Physical hurt may occur if not follow
the relative requirements
Note
1.3 Safety guidelines
Only qualified electricians are allowed to operate.
Do not carry out any wiring and inspection or changing components
when the power supply is applied.
Do not refit unless authorized; otherwise fire, electric shock or other
injury may occur.

RBU100H operation manual 1 Safety precautions
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1.3.1 Delivery and installation
Please install the RBU on fire-retardant material.
Do not operate on the RBU if there is any damage or components loss.
Do not touch the RBU, internal components and PCB board after wiring;
otherwise electric shock may occur due to the present high DC voltage.
Note:
Select appropriate moving and installing tools to ensure a safe and normal running of the RBU
and avoid physical injury or death. For physical safety, the erector should take some
mechanical protective measurements, such as wearing exposure shoes and working uniforms.
Ensure to avoid physical shock or vibration during delivery and installation.
Do not carry the RBU by its cover. The cover may fall off.
Install away from children and other public places.
The RBU cannot meet the requirements of low voltage protection in IEC61800-5-1 if the sea
level of installation site is above 2000m.
Please use the RBU in proper environment.
Avoid any conductive objects on the front cover, otherwise electrical shock may occur.
Tighten up the screws when wiring, otherwise fire, leakage current may occur.
1.3.2 Commissioning and running
Disconnect all power supplies applied to the RBU before the terminal
wiring and wait for at least the designated time after disconnecting the
power supply.
Only qualified electricians are allowed to operate on the RBU.
Inspect the wiring before running.
Do not touch the terminals of control board when power on.
Before running, ensure the master/slave selection and voltage class
setting are correct.
Adjust and inspect the RBU only after the power indicator is totally off
and the RBU DC bus voltage is measured to be lower than 36V by a
multi-meter.
Do not touch any internal components during the running.
The RBU is an accessory device of the variable-frequency drive (VFD).
Before the use, install a special fuse for semiconductor. Otherwise, in
addition to the RBU failure, the VFD failure or damage may result. No
matter whether the VFD fault is related to the RBU, we are not
responsible for any VFD fault. Please install semiconductor fuses.

RBU100H operation manual 1 Safety precautions
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The RBU is not equipped with a buffer circuit. It is recommended to use
the RBU with the BUB series buffer product or configure a buffer unit by
yourself to avoid RBU damage due to unbuffered power-on shock.
Note:
Do not switch on or off the input power supply of the RBU frequently.
Ensure correct setting of the RBU.
Do not do any voltage test on the RBU; otherwise damage to the semiconductor components
may occur.
Fans or other cooling device are needed in multiple installations.
Temperature and other protection are needed for RBU. Our company is not responsible for any
heating damage to the regenerative resistor caused by the RBU fault.
1.3.3 Maintenance and replacement of components
Only qualified electricians are allowed to perform the maintenance,
inspection, and components replacement of the RBU.
Disconnect all power supplies to the RBU before the terminal wiring.
Take measures to avoid screws, cables and other conductive matters to
fall into the RBU during maintenance and component replacement.
Note:
Please select proper torque to tighten screws.
Keep the RBU, parts and components away from combustible materials during maintenance
and component replacement.
Do not carry out any isolation and pressure test on the RBU and do not measure the control
circuit of the RBU by megohmmeter.
1.3.4 Scrap treatment
There are heavy metals in the RBU. Deal with it as industrial effluent.
When the life cycle ends, the product should enter the recycling system.
Dispose of it separately at an appropriate collection point instead of
placing it in the normal waste stream.

RBU100H operation manual 2 Inspection
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2 Inspection
2.1 Unpacking inspection
Check as followings after receiving products:
1. Check that there are no damage and humidification to the package. If not, please contact
with local agents or INVT offices.
2. Check the information on the type designation label on the outside of the package to
verify that the drive is of the correct type. If not, please contact with local dealers or INVT
offices.
3. Check that there are no signs of water in the package and no signs of damage or breach
to the RBU. If not, please contact with local dealers or INVT offices.
4. Check the information on the type designation label on the outside of the package to
verify that the name plate is of the correct type. If not, please contact with local dealers or
INVT offices.
2.2 Application confirmation
Check as followings before the actual installation and usage:
1. Check that the ambient temperature of the RBU is below 40°C . If exceeds, derate 3% for
every additional 1°C . Additionally, the RBU cannot be used if the ambient temperature is
above 50°C .
2. Check that the ambient temperature of the RBU in actual usage is above -10°C. If not,
add heating facilities.
3. Check that the altitude of the actual usage site is below 1000m. If exceeds, derate 1% for
every additional 100m.
4. Check that the humidity of the actual usage site is below 90% and condensation is not
allowed. If not, add additional protection devices.
5. Check that the actual usage site is away from direct sunlight and foreign objects cannot
enter the RBU. If not, add additional protective measures.
6. Check that there is no conductive dust or flammable gas in the actual usage site. If not,
add additional protection to the RBU.
2.3 Installation confirmation
Check as followings after the installation:
1. Check that the load range of the input and output cables meet the need of actual load.
2. Check correct setting of the RBU.
3. Check that the RBU is installed on non-flammable materials and the calorific accessories

RBU100H operation manual 2 Inspection
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(reactors and brake resistors) are away from flammable materials.
4. Check that all control cables and power cables are run separately and the routation
complies with EMC requirement.
5. Check that all grounding systems are properly grounded according to the requirements
of the RBU.
6. Check that the free space during installation is sufficient according to the instructions in
user’s manual.
7. Check that the external connection terminals are tightly fastened and the torque is
appropriate.
8. Check that there are no screws, cables and other conductive items left in the RBU. If not,
get them out.

RBU100H operation manual 3 Product overview
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3 Product overview
3.1 Comprehensive features
Technological feature
Instruction
Voltage range
AC 3PH 380V(-15%)–440V(+10%)
AC 3PH 520V(-15%)–690V(+10%)
Brake torque
Continuously run with 100% of rated torque
AC power
380VAC/660VAC, 50/60Hz
AC voltage range
+10%–15%, the imbalance between phases less than 2%
AC frequency range
Less than 3Hz
Control mode
Current control with 120°
AC power factor
Higher than 0.9
Overload capacity
60s with 150% of rated current
Operation mode
External terminal; Keyboard
Fault output
Relay output
Status display
LED keypad
Analog output
Voltage (0–10V)
Overcurrent protection
330% of the rated current
Overload protection
60s with 150% of rated current
Overvoltage
DC: 830V/1250V
Over-temperature
Temperature resistance detection
AC phase failure fault
AC phase loss
AC frequency failure
fault
Fluctuating higher than 3Hz
3.2 Product name and model
Designation keys:
Designation key
Instruction
A
RBU: regenerative braking unit
B
1 means the technological version
C
00 are the spare codes
D
H: heavy-load

RBU100H operation manual 3 Product overview
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Designation key
Instruction
E
Power code; 055 means 55kW
F
4: AC 3PH 380V(-15%)–440V(+10%)
6: AC 3PH 520V(-15%)–690V(+10%)
3.3 Rated specifications
The rated power of RBU100H is the motor power at 100% braking torque.
3.3.1 380V
Model
Rated
power
(kW)
Rated
current at
DC side (A)
Rated
current at
AC side (A)
Input
reactor
Regenerative
output
reactor
RBU100H-022-4
22
37
30
ACL2-022-4
ERL-022-4-C
RBU100H-030-4
30
51
40
ACL2-030-4
ERL-037-4
RBU100H-045-4
45
77
60
ACL2-045-4
ERL-055-4
RBU100H-055-4
55
96
75
ACL2-055-4
ERL-055-4
RBU100H-090-4
90
150
120
ACL2-075-4
ERL-090-4
RBU100H-110-4
110
183
145
ACL2-110-4
ERL-090-4
RBU100H-132-4
132
220
176
ACL2-160-4
ERL-132-4
RBU100H-160-4
160
267
213
ACL2-160-4
ERL-160-4-C
RBU100H-200-4
200
333
266
ACL2-200-4
ERL-220-4
RBU100H-250-4
250
417
330
ACL2-280-4
ERL-250-4
3.3.2 660V
Model
Rated
power
(kW)
Rated
current at
DC side(A)
Rated
current at
AC side(A)
Input
reactor
Regenerative
output
reactor
RBU100H-055-6 55 52 42 ACL-055-6 ERL-055-6
RBU100H-090-6 90 86 68 ACL-110-6-A ERL-090-6-A
RBU100H-160-6 160 152 122 ACL-160-6 ERL-160-6
RBU100H-200-6 200 190 152 ACL-200-6 ERL-200-6
RBU100H-315-6 315 300 230 ACL-315-6 ERL-315-6
RBU100H-400-6 400 400 330 ACL-400-6 ERL-400-6
Note:
RBU 380V 22kW–45 kW has internal output reactor. RBU 380V 55kW–250kW/660V
55kW–400kW has standard output reactor.
Each RBU100H has 1 standard input reactor. Select the input reactor according to the rated
parameters of the VFD.
The input filter is optional. Select the input filter according to the rated parameters of the VFD.
The fuse is optional. Configure the fuse at 1.5 times of the rated current of the RBU.

RBU100H operation manual 4 Installation guidelines
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4 Installation guidelines
Only qualified electricians are allowed to carry out what described in this
chapter. Please operate as the instructions in chapter 1 Safety precautions.
Ignoring these may cause physical injury or death or damage to the devices.
Ensure the power supply of the RBU is disconnected during the operation.
Wait for at least the time designated until the POWER indicator is off after the
disconnection if the power supply is applied. It is recommended to use the
multimeter to monitor that the DC bus voltage of the drive is under 36V.
The installation and design of the RBU should be complied with the
requirement of the local laws and regulations in the installation site. If the
installation infringes the requirement, our company will exempt from any
responsibility. Additionally, if users do not comply with the suggestion, some
damage beyond the assured maintenance range may occur.
Don not hold the front cover only during moving, otherwise the machine may
fall.
4.1 Installation environment
The installation environment is the safeguard for a full performance and long-term working of the RBU.
Check the installation environment as followings:
Environment
Conditions
Installation site
Indoor
Environment
temperature
-10–+40°C
It is not recommended to use the RBU if the ambient temperature is
above 40°C .
In order to improve the reliability of the device, do not use the RBU
if the ambient temperature changes frequently.
Please provide cooling fan or air conditioner to control the internal
ambient temperature below the required one if the RBU is used in a
closed space such as in the control cabinet.
When the temperature is too low, if the RBU needs to restart to run
after a long stop, it is necessary to provide an external heating
device to increase the internal temperature, otherwise damage to
the devices may occur.
Humidity
RH≤90%
No condensation is allowed.
The maximum relative humility should be equal to or less than 60%
in corrosive air.

RBU100H operation manual 4 Installation guidelines
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Environment
Conditions
Storage
temperature
-30–+60°C
Running
environment
condition
The installation site should:
keep away from the electromagnetic radiation source;
keep away from contaminative air, such as corrosive gas, oil mist
and flammable gas;
ensure foreign objects, such as metal power, dust, oil, water cannot
enter into the RBU(do not install the RBU on the flammable
materials such as wood);
keep away from direct sunlight, oil mist, steam and vibration
environment.
Altitude
Below 1000m
If the sea level is above 1000m, please derate 1% for every
additional 100m.
100%
80%
60%
40%
1000 2000 3000 4000（m）
Iout
Vibration
≤ 5.8m/s2(0.6g)
Installation direction
The RBU should be installed on an upright position to ensure
sufficient cooling effect.
Note:
RBU100H should be installed in a clean and ventilated environment according to enclosure
classification.
Cooling air must be clean, free from corrosive materials and electrically conductive dust.
4.2 Installation direction
The RBU100H may be installed on the wall or in a cabinet.
The RBU100H must be installed in an upright position. Check the installation site according to the
requirements below. Refer to chapter 9 Dimension and size for frame details.
4.3 Installation steps
(1) Mark the hole location. The location of the holes is shown in the dimension drawings in chapter 9
Dimension and size.

RBU100H operation manual 4 Installation guidelines
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(2) Fix the screws or bolts to the marked locations.
(3) Position the drive onto the wall.
(4) Tighten the screws in the wall securely.
Figure 4-1 Installation space
Note: The minimum space of B and C is 100mm.
Multiple vertical installation
Figure 4-2 UP/DOWN installation
Note: Windscreen should be added in vertical installation for avoiding mutual impact and insufficient
cooling.

RBU100H operation manual 4 Installation guidelines
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4.4 Terminals and function
4.4.1 Terminals of the main circuit
（+）（-）R S T
r s t
Figure 4-3 Terminals of the main circuit
The main circuit of RBU100H is very simple. Connect the terminals "(+)" and "(-)" of the RBU to the
positive and negative poles of the VFD; connect the terminals "R", "S" and "T" of the RBU to the
power supply of the VFD input end directly or by means of output reactor; connect the terminals "r",
"s" and "t" of the RBU to the grid.
It is necessary to use an external reactor on RBU100H (the RBU of 380V
22–45kW has internal reactor). The reactor terminals must match the RBU
terminals; otherwise the damage to RBU and fire may occur.
Note the polarity of the RBU; otherwise the damage to RBU and fire may
occur.
The "r", "s" and "t" of the RBU connect to 3PH power terminals "R", "S", and
"T" respectively (see Figure 4-5 and Figure 4-6). Otherwise, breaker tripping
or RBU fault or even damage may occur.
Ground the PE terminal of the RBU to avoid physical injuries.
4.4.2 Terminals of the control circuit
ROA ROB ROC
AO GND S1 S2 S3 S4 COM +24V Y
Figure 4-4 Terminals of the control circuit
Terminal
Function
S1–S4
ON-OFF input terminal. Optical coupling isolation input terminal with +24V
and COM.
S1: Valid in terminal control. Automatic input.
S2: Valid in terminal control. Automatic/Manual input.
S3: Multi-function terminal
S4: Multi-function terminal
Y
Open collector output terminal, the corresponding common ground terminal
Terminal
Function
r, s, t
Terminals of 3-phase AC input (see Figure 4-5 and Figure 4-6)
(+), (-)
Input terminals of RBU
R, S, T
Terminals of external DC reactor or VFD (see Figure 4-5 and Figure 4-6)
Grounding terminal (PE)

RBU100H operation manual 4 Installation guidelines
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Terminal
Function
is COM.
External voltage range: 0–24V
Output current range: 0–50mA
+24V
+24V power supply for the local device, with a maximum output current of
150mA
COM
+24V common terminal
AO
Output range: 0–10V
GND
Reference null potential of AO
RO1A,
RO1B,
RO1C
RO1 relay output, ROAcommon terminal, ROB NC, ROC NO
Contactor capability: AC250V/3A, DC30V/1A
4.5 Standard wiring
4.5.1 400V 22kW–45kW
R
S
T
U
V
W
R
S
T
r
s
t
S1
S2
S3
S4
COM
24V Y
COM
M
Power supply VFD
RBU
Input filter Input
reactor
ROB
ROA
ROC
PE
PE
AO
GND
CN9
Regenerative system
Port of external keypad
Open collector output
RO
(+) (-)
(-)(+)
It is recommended to use fuse.
Figure 4-5 Standard wiring of RBU 380V 22kW–45kW
Note:
RBU 380V 22kW–45kW has internal output reactor.
The input reactor is standard.

RBU100H operation manual 4 Installation guidelines
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The input filter is optional.
The fuse is optional. Configure the fuse at 1.5 times of the rated current of the RBU.
4.5.2 380V 55kW–250kW/660V 55kW–400kW
R
S
T
U
V
W
R
S
T
r
s
t
S1
S2
S3
S4
COM
24V Y
COM
M
Regenerative
reactor
ROB
ROA
ROC
PE
PE
AO
GND
CN9
(+) (-)
(-)(+)
Power supply Input filter Input
reactor VFD
It is recommended to use fuse.
Regenerative system RBU
Port of external keypad
Open collector output
RO
Figure 4-6 Standard wiring of RBU 380V 55kW–250kW/660V 55kW–400kW
Note:
RBU 380V 55kW–250kW/660V 55kW–400kW has standard input/output reactor.
Input filter is optional.
The fuse is optional. Configure the fuse at 1.5 times of the rated current of the RBU.
4.6 Parallel connection
4.6.1 Parallel connection of RBU100H (M-S configuration)
Steps:
1. Master setting:
1)P0.17=2;
2) Select P0.00=1 (terminal control);
3) Set as manual mode or automatic mode.
2. Slave setting:
1) Connect Y and COM of the master to S2 and COM of the slave;

RBU100H operation manual 4 Installation guidelines
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2) Select P0.00=1 (terminal control);
3) Set as manual mode (S2 valid).
R
S
T
U
V
W
R
S
T
R
S
T
r
s
t
S1
S2
S3
S4
COM
24V
S1
S2
S3
S4
COM
24V
Y
COM
M
Power supply
VFD
RBU
Input filter Input
reactor
Regenerative
reactor Regenerative
reactor
RBU
Master Slave
PE
CN9
AO
GND
ROB
ROA
ROC
Y
COM
CN9
AO
GND
ROB
ROA
ROC
PE
r
s
t
PE
(+) (-)
(+) (-)(-)(+)
PE
It is recommended to
use fuse
It is
recommended
to use fuse
Figure 4-7 Parallel connection 1 of RBU100H
Connection instruction: make the first RBU as the master and others as the slave in parallel
connection. Connect the Y and COM terminal of the first RBU to the S2 and COM terminal of the
second one, third one and so on.
Note:
RBU 380V 22kW–45Kw has internal output reactor. RBU 380V 55kW–250kW/660V
55kW–400kW has standard output reactor.
Each RBU100H has 1 standard input reactor. Select the input reactor according to the rated
parameters of the VFD.
The input filter is optional. Select the input filter according to the rated parameters of the VFD.
The fuse is optional. Configure the fuse at 1.5 times of the rated current of the RBU.
Derate 90% of the RBU100H in parallel connection.

RBU100H operation manual 4 Installation guidelines
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4.6.2 Parallel connection of RBU100H (No master and slave)
R
S
T
U
V
W
R
S
T
R
S
T
r
s
t
S1
S2
S3
S4
COM
24V
S1
S2
S3
S4
COM
24V
Y
COM
M
PE
CN9
AO
GND
ROB
ROA
ROC
Y
COM
CN9
AO
GND
ROB
ROA
ROC
PE
r
s
t
PE
(+) (-)
(+) (-)(-)(+)
PE
Power supply Input filter Input
reactor VFD
Regenerative
reactor
It is recommended
to use fuse. Regenerative
reactor
It is recommended
to use fuse.
RBU RBU
Figure 4-8 Parallel connection 2 of RBU100H
Note:
RBU100H 380V 22kW–45kW has internal output reactor. RBU100H 380V 55kW–250kW/660V
55kW–400kW has standard output reactor.
Each RBU100H has 1 standard input reactor. Select the input reactor according to the rated
parameters of the VFD.
The input filter is optional. Select the input filter according to the rated parameters of the VFD.
The fuse is optional. Configure the fuse at 1.5 times of the rated current of the RBU.
Derate 90% of the RBU100H in parallel connection.

RBU100H operation manual 5 Keypad operation
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5 Keypad operation
5.1 Keypad
5.1.1 Keyboard diagram
RUN/TUNE FWD/REV LOCAL/REMOT TRIP
RPM
%
Hz
A
V
PRG
ESC DATA
ENT
R U N STOP
RST
QUICK
JOG SHIFT
Indicators
Unit indicator
Enter key
Shift key
Stop/ret key
Digital display
Program key
Shortcut key
Run key
Modify key
Figure 5-1 Keypad diagram
5.1.2 Buttons
Button
Name
Function
PRG
ESC
Program Key
Enter or escape from the first level menu to delete the parameter
quickly
DATA
ENT
Enter Key
Progressively enter menu and confirm parameters.
UP Increment
Key
Progressively increase data or function codes.
DOWN
Decrement
Key
Progressive decrease data or function codes.
>>
SHIFT
Shift Key
In parameter setting mode, press this button to select the bit to be
modified. In other modes, cyclically displays parameters by right
shift
RUN
Run Key
Start to run the device in keypad control mode.

RBU100H operation manual 5 Keypad operation
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Button
Name
Function
STOP
RST
STOP/RST
Key
In running status, restricted by P0.00, can be used to stop the
device. When fault alarm, the button can be used to reset the
device without any restriction.
5.1.3 Indicators
1)Function indicator light description:
Function indicator
Description
RUN/TUNE
Extinguished: stop status
Flickering: parameter autotuning status
Light on: operating status
LOCAL/REMOT
Extinguished: keypad control
Flickering: terminal control
Light on: communication control
TRIP
Extinguished: normal operation status
Flickering: overload pre-warning status
2)Unit indicator light description:
Function indicator
Description
Hz
Frequency unit
A
Current unit
V
Voltage unit
RPM
Rotating speed unit
％
Percentage
System temperature
3)Digital display:
5-digit LED, which can display all kinds of monitoring data and alarm codes such as reference
frequency, output frequency and so on.

RBU100H operation manual 6 Function parameters
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6 Function parameters
6.1 Function code
Code
Name
Detailed instruction
Default
Modify
P0.00
Control mode
0–1
0: Keypad
1: Terminal
S1 valid: automatic operation
S2 valid: manual operation
1
◎
P0.01
Keypad control
0–1
0: Automatic operation
1: Manual operation
0
◎
P0.02
Filter time
1–10
1
◎
P0.03
DC bus voltage
establishment time
0–10000ms
10000ms
○
P0.04
Regenerative voltage
difference during
starting
0.0–240.0V
380V voltage degree
660V voltage degree
40.0V
60.0V
○
P0.05
Regenerative voltage
difference during
stopping
0.0–120.0V
380V voltage degree
660V voltage degree
10.0V
15.0V
○
P0.06
Regenerative stop
time
0.1–10.0s
1.0s
○
P0.07
Input frequency
0~1
0:50Hz
1:60Hz
0
◎
P0.08
S3 function
1–15
3:Valid when connect S3 to COM
Other reserved
3 (external
fault)
◎
P0.09
S4 function
1–15
2: Valid when connect S4 to COM
Other reserved
2 (fault
reset)
◎
P0.10
Reserved
1
○
P0.11
AO output
0–8
0: DC
voltage(0–1000V/1500V/3000V)
1: Output current (0–200.0%)
2–8: Reserved
1
○
P0.12
Lower limit of AO
output
0.0%–100.0%
0.0%
○