Unitronics UMI-B1 UL Series User manual

UMI-B1 UL Series
Inver ter
www.unitronicsPLC.com

UMI-B1 UL Series Inverter Contents
i
Contents
Contents ..........................................................................................................................i
1 Safety precautions......................................................................................................1
1.1 Safety definition ...................................................................................................1
1.2 Warning symbols .................................................................................................1
1.3 Safety guide.........................................................................................................2
2 Product overview........................................................................................................5
2.1 Quick start-up.......................................................................................................5
2.2 Product specification............................................................................................7
2.3 Name plate.........................................................................................................10
2.4 Type designation key.........................................................................................10
2.5 Structure diagram............................................................................................... 11
3 Installation guide ......................................................................................................12
3.1 Mechanical installation.......................................................................................12
3.2 Standard wiring..................................................................................................14
3.3 Layout protection ...............................................................................................19
4 Keypad operation procedure...................................................................................21
4.1 Keypad introduction ...........................................................................................21
4.2 Keypad displaying..............................................................................................23
4.3 Keypad operation...............................................................................................25
5 Function parameters ................................................................................................27
6 Fault Tracking ...........................................................................................................98
6.1 Maintenance intervals........................................................................................98
6.2 Fault solution....................................................................................................103
7 Communication protocol .......................................................................................109
7.1 Brief instruction to Modbus protocol ................................................................109
7.2 Application of the inverter ................................................................................109
7.3 RTU command code and communication data illustration .............................. 115
Appendix A Technical data .......................................................................................131
A.1 Ratings ............................................................................................................131
A.2 Marking............................................................................................................132
A.3 EMC regulations..............................................................................................132
Appendix B Dimension drawings.............................................................................134
B.1 External keypad (optional) structure................................................................134
B.2 Inverter chart ...................................................................................................135
Appendix C Further information ..............................................................................137
C.1 Product and service inquiries..........................................................................137

UMI-B1 UL Series Inverter Safety precautions
1
1 Safety precautions
Read this manual carefully and follow all safety precautions before moving, installing,
operating and servicing the inverter. If ignored, physical injury or death may occur, or
damage may occur to the devices.
If any physical injury or death or damage to the devices occurs for ignoring to the safety
precautions in the manual, our company will not be responsible for any damages and we
are not legally bound in any manner.
1.1 Safety definition
Danger:
Serious physical injury or even death may occur if related
requirements are not followed
Warning:
Physical injury or damage to the devices may occur if related
requirements are not followed
Note:
Physical hurt may occur if related requirements are not
followed
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 and/or
damage to the equipment, and advice on how to avoid the danger. Following warning
symbols are used in this manual:
Symbols
Name
Instruction
Abbreviation
Danger
Danger
Serious physical injury or even
death may occur if related
requirements are not followed
Warning
Warning
Physical injury or damage to the
devices may occur if related
requirements are not followed
Do not
Electrostatic
discharge
Damage to the PCBA board may
occur if related requirements are
not followed
Hot sides
Hot sides
Sides of the device may become
hot. Do not touch.
Note
Note
Physical hurt may occur if related
requirements are not followed
Note

UMI-B1 UL Series Inverter Safety precautions
2
1.3 Safety guide
•Only qualified electricians are allowed to operate on the inverter.
•Do not carry out any wiring and inspection or changing components
when the power supply is applied. Ensure all input power supplies are
disconnected before wiring and checking and always wait for at least the
time designated on the inverter or until the DC bus voltage is less than
36V. Below is the table of the waiting time:
Inverter module
Minimum waiting time
1PH 220V
0.5~3HP (0.4–2.2kW)
5 minutes
3PH 220V
0.5~1HP (0.4–0.75kW)
5 minutes
3PH 460V
1~3HP (0.75–2.2kW)
5 minutes
•Do not refit the inverter unauthorized; otherwise fire, electric shock or
other injury may occur.
•The base of the radiator may become hot during running. Do not touch
to avoid hurt.
•The electrical parts and components inside the inverter are electrostatic.
Take measurements to avoid electrostatic discharge during relevant
operation.
1.3.1 Delivery and installation
•Install the inverter on fire-retardant material and keep the inverter
away from combustible materials.
•Connect the braking optional parts (braking resistors, braking units or
feedback units) according to the wiring diagram.
•Do not operate on the inverter if there is any damage or components
loss to the inverter.
•Do not touch the inverter with wet items or body, otherwise electric
shock may occur.
•Solid-state motor overload protection is performed when the inverter
runs at 150% of FLA.
•The inverter does not provide motor over-temperature protection.
Note:
•Select appropriate moving and installing tools to ensure a safe and normal running of
the inverter 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.

UMI-B1 UL Series Inverter Safety precautions
3
•Do not carry the inverter by its cover. The cover may fall off.
•Install away from children and other public places.
•The inverter cannot meet the requirements of low voltage protection in IEC61800-5-1
if the altitude of the installation site is above 6562ft (2000m).
•The leakage current of the inverter may be above 3.5mA during operation. Ground
with proper techniques and ensure the grounding resistance is less than 10Ω. The
conductivity of PE grounding conductor is the same as that of the phase conductor
(with the same cross sectional area).
•R, S and T are the input terminals of the power supply, while U, V and W are the
motor terminals. Connect the input power cables and motor cables with proper
techniques; otherwise the damage to the inverter may occur.
1.3.2 Commissioning and running
•Disconnect all power supplies applied to the inverter before the
terminal wiring and wait for at least the designated time after
disconnecting the power supply.
•High voltage is present inside the inverter during running. Do not carry
out any operation except for the keypad setting.
•The inverter may start up by itself when P01.21=1. Do not get close to
the inverter and motor.
•The inverter can not be used as "Emergency-stop device".
•The inverter can not be used to break the motor suddenly. A
mechanical braking device should be provided.
Note:
•Do not switch on or off the input power supply of the inverter frequently.
•For inverters that have been stored for a long time, check and fix the capacitance and
try to run it again before utilization (see Maintenance and Hardware Fault Diagnose).
•Cover the front board before running, otherwise electric shock may occur.
1.3.3 Maintenance and replacement of components
•Only qualified electricians are allowed to perform the maintenance,
inspection, and components replacement of the inverter.
•Disconnect all power supplies to the inverter before the terminal
wiring. Wait for at least the time designated on the inverter after
disconnection.
•Take measures to avoid screws, cables and other conductive matters
to fall into the inverter during maintenance and component
replacement.

UMI-B1 UL Series Inverter Safety precautions
4
Note:
•Select proper torque to tighten screws.
•Keep the inverter, parts and components away from combustible materials during
maintenance and component replacement.
•Do not carry out any isolation and pressure test on the inverter and do not measure
the control circuit of the inverter by megameter.
1.3.4 What to do after scrapping
There are heavy metals in the inverter. Deal with it as industrial effluent.

UMI-B1 UL Series Inverter Product overview
5
2 Product overview
2.1 Quick start-up
2.1.1 Unpacking inspection
Check as follows after receiving products:
1. Check whether the packing box is damaged or dampened. If yes, contact local
dealers or UNITRONICS offices.
2. Check the model identifier on the exterior surface of the packing box is consistent
with the purchased model. If no, contact local dealers or UNITRONICS offices.
3. Check whether the interior surface of packing box is abnormal, for example, in wet
condition, or whether the enclosure of the inverter is damaged or cracked. If yes,
contact local dealers or UNITRONICS offices.
4. Check whether the name plate of the inverter is consistent with the model identifier
on the exterior surface of the packing box. If no, contact local dealers or
UNITRONICS offices.
5. Check whether the accessories (including user's manual and control keypad)
inside the packing box are complete. If no, contact local dealers or UNITRONICS
offices.
2.1.2 Application confirmation
Check the machine before beginning to use the inverter:
1. Check the load type to verify that there is no overload of the inverter during work
and check whether the power degree of the inverter needs to be modified.
2. Check that the actual current of the motor is less than the rated current of the
inverter.
3. Check that the control accuracy of the load is the same of the inverter.
4. Check that the incoming supply voltage is correspondent to the rated voltage of the
inverter.
2.1.3 Environment
Check as follows before the actual installation and usage:
1. Check that the ambient temperature of the inverter is below 104°F (40°C ). If
exceeds, derate 1% for every additional 1.8°F (1°C ). Additionally, the inverter can not
be used if the ambient temperature is above 122°F (50°C ).
Note: For the cabinet inverter, the ambient temperature means the air temperature
inside the cabinet.
2. Check that the ambient temperature of the inverter in actual usage is above 14°F
(-10°C ). If no, add heating facilities.
Note: For the cabinet inverter, the ambient temperature means the air temperature

UMI-B1 UL Series Inverter Product overview
6
inside the cabinet.
3. Check that the altitude of the actual usage site is below 3281ft (1000m). If exceeds,
derate1% for every additional 328ft (100m).
4. Check that the humidity of the actual usage site is below 90% and condensation is
not allowed. If no, add additional protection inverters.
5. Check that the actual usage site is away from direct sunlight and foreign objects
can not enter the inverter. If no, add additional protective measures.
6. Check that there is no conductive dust or flammable gas in the actual usage site. If
no, add additional protection to inverters.
2.1.4 Installation confirmation
Check as follows after the installation:
1. Check that the load range of the input and output cables meet the need of actual
load.
2. Check that the accessories of the inverter are correctly and properly installed. The
installation cables should meet the needs of every component (including reactors,
input filters, output reactors, output filters, DC reactors, braking units and braking
resistors).
3. Check that the inverter is installed on non-flammable materials and the calorific
accessories (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 inverter.
6. Check that the free space during installation is sufficient according to the
instructions in user's manual.
7. Check that the installation conforms to the instructions in user's manual. The
inverter must be installed in an upright position.
8. Check that the external connection terminals are tightly fastened and the torque is
appropriate.
9. Check that there are no screws, cables and other conductive items left in the
inverter. If no, get them out.
2.1.5 Basic commissioning
Complete the basic commissioning as follows before actual utilization:
1. Autotune. If possible, de-coupled from the motor load to start dynamic autotune. Or
if no, static autotune is available.
2. Adjust the ACC/DEC time according to the actual running of the load.
3. Commission the device via jogging and check that the rotation direction is as
required. If no, change the rotation direction by changing the wiring of motor.
4. Set all control parameters and then operate.

UMI-B1 UL Series Inverter Product overview
7
2.2 Product specification
Function
Specification
Power
input
Input voltage (V)
AC 1PH 200V–240V, rated voltage: 220V
AC 3PH 200V–240V, rated voltage: 220V
AC 3PH 380V–480V, rated voltage: 460V
Allowable voltage
fluctuation
-15%–+10%
Input current (A)
Refer to the rated value
Input frequency
(Hz)
50Hz or 60Hz Allowed range: 47–63Hz
Power
output
Output voltage (V)
0–input voltage
Output current (A)
Refer to the rated value
Output power
HP (kW)
Refer to the rated value
Output frequency
(Hz)
0–400Hz
Technical
control
feature
Control mode
SVPWM, SVC
Adjustable-speed
ratio
Asynchronous motor 1: 100 (SVC)
Speed control
accuracy
±0.2% (SVC)
Speed fluctuation
±0.3% (SVC)
Torque response
<20ms (SVC)
Torque control
accuracy
10%
Starting torque
0. 5Hz/150% (SVC)
Overload
capability
150% of rated current: 1 minute
180% of rated current: 10 seconds
200% of rated current: 1 second

UMI-B1 UL Series Inverter Product overview
8
Function
Specification
Running
control
feature
Frequency setting
method
Digital setting, analog setting, pulse frequency
setting, multi-step speed running setting, simple
PLC setting, PID setting, MODBUS
communication setting
Shift between the set combination and set
channel.
Auto-adjustment
of the voltage
Keep a stable voltage automatically when the
grid voltage transients
Fault protection
Provide comprehensive fault protection
functions: overcurrent, overvoltage,
undervoltage, overheating, phase loss and
overload, etc.
Peripheral
interface
Analog input
1 input (AI2): 0–10V/0–20mA; 1 input (AI3):
-10–10V
Analog output
2 inputs (AO1, AO2): 0–10V/0–20mA
Digital input
4 common inputs, max. frequency: 1kHz;
1 high speed input, max. frequency: 50kHz
Digital output
1 Y1 terminal output; 2 programmable relay
outputs
Relay output
2 programmable relay outputs
RO1A NO, RO1B NC, RO1C common terminal
RO2A NO, RO2B NC, RO2C common terminal
Contact capacity: 3A/AC250V
Others
Mountable
method
Wall and rail mountable
Temperature of
the running
environment
14~122°F (-10–50°C), derate above 104°F
(40°C)

UMI-B1 UL Series Inverter Product overview
9
Function
Specification
Protective degree
Note:
1. The inverter with plastic casing should be
installed in metal distribution cabinet, which
conforms to IP20 and of which the top conforms
to IP3X.
2. Install device in pollution degree 2
environment
Cooling
Air-cooling
Braking unit
Embedded
EMI filter
Optional filter: meet the degree requirement of
IEC61800-3 C2, IEC61800-3 C3
Safety
Meet the requirements of CE, UL and CUL
Overvoltage
category
1PH&3PH 240V: Used in Canada only:
"Transient surge suppression shall be installed
on the line side of this equipment and shall be
rated 240V (phase to ground), 240V (phase to
phase), suitable for overvoltage category III, and
shall provide protection for a rated impulse
withstand voltage peak of 4kV" or equivalent.
3PH: Used in Canada only: "Transient surge
suppression shall be installed on the line side of
this equipment and shall be rated 480V (phase
to ground), 480V (phase to phase), suitable for
overvoltage category III, and shall provide
protection for a rated impulse withstand voltage
peak of 6kV" or equivalent.

UMI-B1 UL Series Inverter Product overview
10
2.3 Name plate
Figure 2-1 Name plate
2.4 Type designation key
The type designation contains information on the inverter. The user can find the type
designation on the type designation label attached to the inverter or the simple name
plate.
UMI –0022 –E –U –B –B1
①②③④⑤⑥
Figure 2-2 Product type
Key
No.
Description
Detailed content
Product line
①
Abbreviation for
product line
UMI for Unitronics Inverters
Rated power
②
Power range
0004:400W
0022:2.2kW(3HP)
Voltage degree
③
Voltage degree
B: 1PH 200V–240V
C: 3PH 200V–240V
E: 3PH 380V–480V
Certification
④
Certification
U: UL
Optional
Braking unit
⑤
Optional Braking
unit
B: Built-in braking unit.
Product series
⑥
Product series
B1: for B1 Series Inverter Family

UMI-B1 UL Series Inverter Product overview
11
2.5 Structure diagram
Figure 2-3 is the layout figure of the inverter (take the inverter of 1HP (0.75kW) as the
example).
6
10
11
12
8
9
7
43
51
3
2
1
Figure 2-3 Product structure
Serial
No.
Name
Description
1
External keypad port
Connect the external keypad
2
Port cover
Protect the external keypad port
3
Cover
Protect the internal parts and components
4
Hole for the sliding
cover
Fix the sliding cover
5
Trunking board
Protect the inner components and fix the cables
of the main circuit
6
Name plate
See Product Overview for detailed information
7
Potentiometer knob
Refer to the Keypad Operation Procedure
8
Control terminals
See Electric Installation for detailed information
9
Main circuit terminals
See Electric Installation for detailed information
10
Screw hole
Fix the fan cover and fan
11
Cooling fan
See Maintenance and Hardware Fault
Diagnose for detailed information
12
Fan cover
Protect the fan
Note: In above figure, the screws at 4 and 10 are provided with packaging and specific
installation depends on the requirements of customers.

UMI-B1 UL Series Inverter Installation guide
12
3 Installation guide
The chapter describes the mechanical installation and electric installation.
•Only qualified electricians are allowed to carry out what described in
this chapter. Operate as the instructions in Safety Precautions.
Ignoring these may cause physical injury or death or damage to the
devices.
•Ensure the power supply of the inverter is disconnected during the
operation. Wait for at least the time designated after the disconnection
if the power supply is applied.
•The installation and design of the inverter 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.
3.1 Mechanical installation
3.1.1 Installation environment
The installation environment is the safeguard for a full performance and long-term stable
functions of the inverter. Check the installation environment as follows:
Environment
Conditions
Installation
site
Indoor
Environment
temperature
14~122°F (-10~50°C), and the temperature changing rate is less
than 0.9°F (0.5°C )/minute.
If the ambient temperature of the inverter is above 104°F (40°C ),
derate 1% for every additional 1.8°F (1°C ).
It is not recommended to use the inverter if the ambient
temperature is above 122°F (50°C ).
In order to improve the reliability of the device, do not use the
inverter if the ambient temperature changes frequently.
Provide cooling fan or air conditioner to control the internal ambient
temperature below the required one if the inverter is used in a close
space such as in the control cabinet.
When the temperature is too low, if the inverter 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.

UMI-B1 UL Series Inverter Installation guide
13
Environment
Conditions
Humidity
RH≤90%
No condensation is allowed.
Storage
temperature
-40~+158°F (-40°C –+70°C ), and the temperature changing rate is
less than 1.8°F (1°C )/minute.
Running
environment
condition
The installation site of the inverter 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 can
not enter into the inverter (do not install the inverter on the
flammable materials such as wood);
keep away from direct sunlight, oil mist, steam and vibration
environment.
Altitude
Below 3281ft (1000m)
If the altitude is above 3281ft (1000m, derate 1% for every
additional 328ft (100m).
Vibration
≤ 5.8m/s2 (0.6g)
Installation
direction
The inverter should be installed on an upright position to ensure
sufficient cooling effect.
Note:
•UMI-B1 UL series inverters 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.
3.1.2 Installation direction
The inverter may be installed in a cabinet.
The inverter needs be installed in the vertical position. Check the installation site
according to the requirements below. Refer to chapter Dimension Drawings in the
appendix for frame details.
3.1.3 Installation manner
The inverter can be installed in two different ways, depending on the frame size:
Figure 3-1: Wall mounting (for all frame sizes)
Figure 3-2: Rail mounting (for all frame sizes, but need optional installation bracket)

UMI-B1 UL Series Inverter Installation guide
14
Figure 3-1 Wall mounting
Figure 3-2 Rail mounting
Note: The minimum space of A and B is 100mm. H is 36.6mm and W is 35.0mm.
3.2 Standard wiring
3.2.1 Connection diagram of main circuit
R
S
TW
V
U
PE
M
(+) PB
Three-phase
380V~480V
50/60Hz
Braking resistor
Input
reactor
Input
filter
Fuse
Output
reactor
Output
filter
L
NW
V
U
PE
M
(+) PB
Single-phase
200V~240V
50/60Hz
Braking resistor
Input
reactor
Input
filter
Fuse
Output
reactor
Output
filter
Figure 3-3 Connection diagram of main circuit
Note:
•The fuse, braking resistor, input reactor, input filter, output reactor, output filter are
optional parts. Refer to Peripheral Optional Parts for detailed information.
•Remove the yellow warning labels of PB, (+) and (-) on the terminals before
connecting the braking resistor; otherwise, poor connection may occur.

UMI-B1 UL Series Inverter Installation guide
15
3.2.2 Terminals figure of main circuit
Figure 3-4 1PH terminals of main circuit
Terminal
Terminal name
Function
L
Power input of the main
circuit
1-phase AC input terminals which are generally
connected with the power supply.
N
U
The inverter output
3-phase AC output terminals which are generally
connected with the motor.
V
W
PB, (+)
Braking resistor terminal
PB and (+) are connected to the external
resistor.
PE
Grounding terminal
Each machine should be grounded.
Figure 3-5 3PH terminals of main circuit
Terminal
Terminal name
Function
R, S, T
Power input of the main
circuit
3-phase AC input terminals which are generally
connected with the power supply.
U, V, W
The inverter output
3-phase AC output terminals which are generally
connected with the motor.
PB, (+)
Braking resistor terminal
PB and (+) are connected to the external
resistor.
PE
Grounding terminal
Each machine should be grounded.
Note:
•Do not use asymmetrically motor cables. If there is a symmetrically grounding
conductor in the motor cable in addition to the conductive shield, connect the
grounding conductor to the grounding terminal at the inverter and motor ends.
•Route the motor cable, input power cable and control cables separately.
•When selecting C3 input filters, connect the filters in parallel at the input side of the
inverter.

UMI-B1 UL Series Inverter Installation guide
16
3.2.3 Wiring of terminals in main circuit
1. Connect the ground line of input power cable to the ground terminal of inverter (PE)
directly, and connect 3PH input cable to R, S and T and fasten up.
2. Connect the ground line of motor cable to the ground terminal of the inverter, and
connect the 3PH motor cable to U, V, W and fasten up.
3. Connect the brake resistor which carries cables to the designated position.
4. Fasten up all the cables on the outside of the inverter if allowed.
3.2.4 Wiring diagram of control circuit
Multi-function input terminal 1
Multi-function input terminal 2
Multi-function input terminal 4
High speed pulse input collector
Multi-function input terminal 3
Open collector input optional
Y1 output
Analog output
Analog output
Relay 1 output
Relay 2 output
S1
S2
S3
S4
HDI
COM
PW
+24V
PE
+10V
AI2
AI3
PE
GND
AI2
V I
Y1
COM
AO1
AO2
V I
VI
AO1
AO2
0–10V/0–20mA
0–10V/0–20mA
COM
COM
RO1A
RO1B
RO1C
RO2A
RO2B
RO2C
Shield layer
Twisted pair
RS485
communication
485+
485-
GND
PE
J5
Figure 3-6 Wiring of control circuit
3.2.5 Terminals of control circuit
ON
GND
Figure 3-7 Terminals of control circuit

UMI-B1 UL Series Inverter Installation guide
17
Type
Terminal
name
Function
description
Technical specifications
Communication
485+
485
communication
RS485 communication interface.
In order to ensure stable
communication channel:
•Use shielded twisted pair
cable.
•Connect the HOST RS485
signal ground to one of the
VFD CMD/GND terminals.
•Connect one of the CMD/GND
terminals to PE terminal.
•Earth the cable shield to the
PE terminal.
485-
Digital
input/output
S1
Digital input
1. Internal impedance: 3.3kΩ
2. 12–30V voltage input is
available
3. The terminal is the
dual-direction input terminal
4. Max. input frequency: 1kHz
S2
S3
S4
HDI
High frequency
input channel
Except for S1–S4, this terminal
can be used as high frequency
input channel.
Max. inputfrequency: 50kHz
Duty cycle: 30%–70%
PW
Digital power
supply
To provide the external digital
power supply
Voltage range: 12–30V
Y1
Digital output
Contact capacity: 50mA/30V
COM
Common terminal of the open
collector output
Analog
input/output
+10V
External 10V
reference
power supply
10V reference power supply
Max. output current: 50mA
As the adjusting power supply of
the external potentiometer
Potentiometer resistance: 5kΩ
above
AI2
Analog input
1. Input range: AI2 voltage and
current can be chosen:
0–10V/0–20mA; AI3:
-10V–+10V.
2. Input impedance:voltage
AI3

UMI-B1 UL Series Inverter Installation guide
18
Type
Terminal
name
Function
description
Technical specifications
input:
20kΩ; current input: 500Ω.
3.Voltage or current input can be
set by dip switch.
4. Resolution: the minimum
AI2/AI3 is 10mV/20mV when
10V corresponds to 60Hz.
GND
Analog
reference
ground
Analog reference ground
AO1
Analog output
1. Output range: 0–10V or
0–20mA
2. The voltage or the current
output is depended on the dip
switch.
3. Deviation±1%, 77°F (25°C )
when full range.
AO2
Relay output
RO1A
Relay 1 NO
contact
RO1 relay output, RO1A NO,
RO1B NC, RO1C common
terminal
RO2 relay output, RO2A NO,
RO2B NC, RO2C common
terminal
Contact capacity: 3A/AC250V
RO1B
Relay 1 NC
contact
RO1C
Relay 1
common
contact
RO2A
Relay 2 NO
contact
RO2B
Relay 2 NC
contact
RO2C
Relay 2
common
contact