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Fläkt Woods 9291 GB 2014.12.05 1 Specifications are subject to change without prior notice.
Installation and maintenance instructions
Installation instructions, drive system
EQRB, L=3.4 sizes 005-072
General description
A speed controlled drive system specifically adapted to
drive rotary heat exchangers.
No tuning is necessary. All control inputs are galvani-
cally isolated from the mains. The unit is supplied with
the motor.
The direction of rotation of the motor is reversible.
Enclosure class IP54.
Safety precautions
Control system for rotary heat exchanger EQRB, L=3,4
Sizes 005-018
Sizes 020-072
Important!
– Read through the entire instruction
manual carefully before unpacking,
installing and using the equipment.
– The installation must be carried out
by authorised personnel.
– Follow the general measures and
regulations for the installation and
operation of electrical installations.
– Follow local measures and regula-
tions to protect against personal
injury and mechanical damage.
– The drive system is intended for
permanent installation.
– Cables must not be connected or
disconnected while the power supply
is on.
– Check that the equipment is correctly
connected before it is taken into
operation. See the instructions under
“Connection specification”, page 2.
– Faults occurring due to incorrect
installation or operation are covered.
During operation
– The unit may not be opened or disas-
sembled during operation.
Disassembly and disposal
– The product is designed to comply
with the RoHS directive and must
be handled and recycled in accordance
with locally applicable legislation.
Regarding the control logic and operation:
During start up and after each time
the AHU has been stopped, it is recom-
mended that the exhaust fan operates
during 1 minute before the supply fan is
started.
Fläkt Woods 9291 GB 2014.12.05 2 Specifications are subject to change without prior notice.
Installation and maintenance instructions
Connection specification
Mains
The power supply is connected on terminal block P1 N,
L, PE, 230VAC +-15% 50/60Hz. The drive system shall
always be preceded by an external fuse 10AT.
Current
Rated current 1.0A.
Motor
The motor is connected on terminal blocks P6 and P7.
The motor has been customised and cannot be replaced
with a similar one.
Functional description
Cleaning mode
When there is no control signal the heat exchanger rota-
tes 30° every 5 minutes.
Communication
The drive unit has built-in Modbus RTU communication
via RS485, terminal block P3 terminals 1 (A+), 2 (B-) and 3
(ref.). The preset parameters for communication are:
Address: 30
Baud rate/Speed: 9600
Parity bit: N, none
Stop bit: 1
Data bits: 8
For a complete Modbus register see Appendix 1:
Communication can be used for all drive system
functions.
Defrosting
It is possible to connect a differential thermostat or pres-
sure monitor to control defrosting on terminal block P3
terminals 4 and 5. When the contact is closed the speed
is reduced to 2 rpm.
Cooling recovery
When terminals 6 and 7 on terminal block P3 are closed
the rotor goes into cooling recovery mode and the speed
increases and remains constant at 25 rpm, irrespective
of control signal.
Rotation sensor
The drive system has a built-in rotation sensor that
detects whether the belt has snapped. Belt testing takes
place at set time intervals depending on the current
speed.
Control signal
The control signal is connected on terminal block P3
terminals 8 and 9.
The control system can handle several different input
signals:
• 0-10VDC
• 2-10VDC
• 0-20mA
• 4-20mA
• ModbusRTU
The choice of control signal is made using dip switches
11 and 12 corresponding to level and type respectively.
The motor speed follows a predetermined linearisation
function proportional to the degree of efficiency of the
rotor.
Control system for rotary heat exchanger EQRB, L=3,4
DIP switch ON position OFF position
9 Speed: 9600
bits: 8
Parity: None
Stop bits: 1 (8N1)
Preprogrammed:
Speed: 19200
Bits: 8
Parity: None
Stop bits: 1
In the off position the
values can be changed
by writing to the holding
register 4x0035-0037
10 Address 30 Address 31
The address can be
changed between
0-256 by writing to the
holding register 4x0034
Modification
Issue
Date
Sign.
otherwise disclosed to any third party without our consent. Contraventions will be prosecuted.
This drawing and its contents is the property of the company and may not be copied or
Formular dwg.
Formulärritn.
-
-
-
-
Jönköping
2012-10-03
21-
Fläkt Woods AB
Issue
Drivenhet
Styrkort
Ritning nr Drawing no
J8007857
A
1:1
Appr
Check
Scale
Date
Drawn by
Dept.
VariantVariant
RI
TJ
C. Axelsson
U
A
2012-10-03
CA
Qty. Qty.
Item no.
Internal article no.
Description
Version 5
No Designation
1 Mains connection
2 Motor phases
3 Hall sensor
4 Modbus, Defrosting, Cooling
recovery, Control signal
5 Alarm output
6 DIP switches
7 Test button
8 LED Indication
8 7 6
1 2 3 4
5
C NO NC
Installation and maintenance instructions
Fläkt Woods 9291 GB 2014.12.05 3 Specifications are subject to change without prior notice.
Control system for rotary heat exchanger EQRB, L=3,4
Alarm relay
Relay output max. 5A, 250VAC. The contact switches in
the event of an alarm.
Run indicator
The drive system indicates, via LEDs, the speed and
operating status of the unit at any point. See table.
Green Red Indication Alarm relay
Steady illumina-
tion
Voltage without
rotation
Flashes in
proportion to
the speed of
the motor.
Speed x 0.5Hz
Extinguished No voltage
Extinguished No alarm Switches
2 flashes Snapped belt Switches
3 flashes Motor locked/
blocked
Switches
3 flashes Timeout target
speed
Switches
4 flashes High/Low
voltage
Switches
5 flashes Motor sensor
fault
5 flashes Cooling
recovery and
defrosting at
the same time
5 flashes High temp.
5 flashes All DIP swit-
ches in the ON
position
Alarm Alarm output Description Info
Snapped belt Yes If the belt
snaps or the
rotor stops the
relay switches.
Reversible
Voltage fault Yes If the supply
voltage is too
high or too low
the relay swit-
ches and the
rotor stops.
Reversible
Overload fault Yes If the motor is
overloaded the
relay switches
and the rotor
stops.
Reversible
Short-circuit Yes If there is a
short-circuit in
the motor the
relay switches.
Permanent
Fault codes
Alarm Fault codes
Low voltage 1
High voltage 2
Snapped belt 4
Motor locked/blocked 8
Motor sensor fault 16
Cooling recovery/Defrosting 32
High temperature 64
DIP switch fault 128
AWD 256
Target speed timeout 512
Fläkt Woods 9291 GB 2014.12.05 4 Specifications are subject to change without prior notice.
Installation and maintenance instructions
Control system for rotary heat exchanger EQRB, L=3,4
Rotor direction of rotation
Supply air
Supply air
The direction of rotation is changed by changing dip
switch 1 and is executed by switching on the power.
DIP switch Corresponding
value
Position Value
2 1 OFF 0
3 2 ON 2
4 4 ON 4
5 8 OFF 0
6 16 ON 16
7 32 OFF
22
Total 63
+ – + –
DIP switch settings
The gear ratio is set at the factory.
The correct activation of the drive system requires that
DIP switches 2-7 be set according to the Binary Coded
Decimal (BCD) coding of the ratio between the rotor and
belt pulley.
For example. Rotor diameter 1000 mm, belt pulley
diameter 38 mm and belt diameter 8 mm, gives ratio
of 1000+8/38+8=22 and the BCD coding is as follows
011010.
Switch
12 11 10 9 8 7 6 5 4 3 2 1 Value Function
1 1 Anti-clockwise
0 0 Clockwise
1 1 1 1 1 1 63 Not set/Fault
111110 62
Program-
mable reg.
0x0031
000000 0
0–61 Deci-
mal value for
gearing
1 Large motor
0 Small motor
1 9600 8N1
0 Std.
Reg.
0x0035-
0x0037
(Std.19200
8N1)
1 Addr: 30
0 Std.
Reg. 0x0034
(Std. Addr:
31)
1 0-10V/
0-20mA
0 2-10V /
4-20mA
1 Control signal
voltage
0 Control signal
current
0
Fläkt Woods 9291 GB 2014.12.05 5 Specifications are subject to change without prior notice.
Installation and maintenance instructions
Control system for rotary heat exchanger EQRB, L=3,4
If necessary the entire control unit must be replaced
including the bracket and motor.
Troubleshooting
Check that the installation has been carried out correct-
ly. For example, that the cables are properly connected
to the correct terminal block and that the dip switches
are set correctly.
Observation/
indication
Fault cause/action:
No LED lit. Check that there is 230VAC ±10%
on the mains terminal block. If the
mains voltage is correct replace the
control unit.
The green LED is
flashing slowly/
cleaning mode
signal
- low control signal
Check that the cables are correctly
connected.
Check the DIP switch.
Vary the control signal between mini-
mum and maximum 0-10 V (2-10 V).
Check by strapping P3 6 and 7, the
motor should now speed up to its
maximum speed.
The motor is not
turning despite a
control signal.
Gearing incorrect.
Check DIP switch 2-7.
The rotation
sensor is gene-
rating an alarm
despite the belt
being intact.
Contact Fläkt Woods.
Observation/
indication
Fault cause/action:
The red LED flashes
twice.
Indicates a snapped belt.
Check that the rotor is no stiffer than
normal, or whether the belt has snap-
ped.
The red LED flashes
three times.
The ramp time to the desired speed
is too long. Check that the rotor is no
stiffer than normal, or locked.
The red LED flashes
four times.
Check the mains voltage.
The red LED flashes
five times.
Sensor problem.
Check the DIP switch.
Check that cooling recovery and
defrosting are not taking place at
the same time
The rotation sensor
is not generating
an alarm despite
the belt having
snapped.
Contact Fläkt Woods.
The motor is rota-
ting in the wrong
direction.
Switch off the power and change DIP
switch 1. Then switch the power on
again.
The motor runs
at full speed even
when the control
signal is low.
Check that the cooling recovery
terminal block is not strapped (6 and
7), or Modbus register 4x0029 is
set to ”1”.
Fläkt Woods 9291 GB 2014.12.05 6 Specifications are subject to change without prior notice.
Installation and maintenance instructions
Control system for rotary heat exchanger EQRB, L=3,4
Register Name Description Read/
Write
Comment Type Min Max Default
3 x 0001 MbusVer Protocol version Read Unsigned 1 65536 1
3 x 0002 HW Hardware version Read Unsigned 1 65536 1
3 x 0003 SW Software version Read Unsigned 1 65536 -
3 x 0004 Nrot Total number of revolu-
tions that the rotor has
rotated since installation
Read Unsigned 0 65536 0
3 x 0005 Nrem Total number of alarms
for drive belt faults
Read Unsigned 0 65536 0
3 x 0006 Nlocked Total number of alarms
for motor faults
Read Unsigned 0 65536 0
3 x 0007 Nsp Total number of alarms
for voltage faults
Read Unsigned 0 65536 0
3 x 0008 Ngiv Total number of alarms
for sensor faults
Read Unsigned 0 65536 0
3 x 0009 M1 Motor size Read Unsigned 1 2 -
3 x 0010 n1 Size of the drive pulley
on the motor
Read According to DIP switch Unsigned 0 63 -
3 x 0012 n Current motor speed Read (RPM) Signed -2000 2000 -
3 x 0013 n3 Current calculated
speed of the rotor
Read Motor speed/gearing (RPM) Signed 0 25 -
3 x 0014 Switch DIP switch Read DIP 1-11 whole number value Unsigned 0 2048 -
3 x 0015 Mode Current operating mode Read 0 = Initiation
1 = Heating
2 = Cooling
3 = Purging
4 = Defrosting
5 = Test button
6 = Belt test
7 = Standstill
8 = Configuration
9 = Fault
10 = Stop
11 = Motor test
Unsigned 10 0
3 x 0016 Signal Read off control signal Read Read off value as a % Unsigned 0 100 0
3 x 0017 Current Average current Read Filter 5ms Unsigned 0 70 -
3 x 0018 Belt_timer1 Countdown before belt
test 1 in seconds
Read Test taking place in 0 seconds Unsigned 0 65536 -
3 x 0019 Belt_timer2 Countdown before belt
test 2 in seconds
Read Test taking place in 0 seconds Unsigned 0 65536 -
3 x 0020 Purge timer Countdown before
purging (seconds)
Read Purging taking place in 0
seconds
Unsigned 0 65536 -
3 x 0021 Rot_count_msb Total number of revolu-
tions that the rotor has
rotated since installation
(most significant bits)
Read Revolutions = 3x0021 *
65535 + 3x0022
Unsigned 0 65536 -
3 x 0022 Rot_count_lsb Total number of revolu-
tions that the rotor has
rotated since installation
(least significant bits)
Read Revolutions = 3x0021 *
65535 + 3x0022
Unsigned 0 65536 -
3 x 0023 Ramp timeout 5 minute countdown to
the rotation alarm delay
Read Value in seconds Unsigned 0 65536 300
3 x 0024 Drive_temp Electronics temperature Read Degrees Celsius Unsigned 0 65536 -
3 x 0025 Smps_temp Processor temperature Read Degrees Celsius Unsigned 0 65536 -
Table 1
Fläkt Woods 9291 GB 2014.12.05 7 Specifications are subject to change without prior notice.
Installation and maintenance instructions
Control system for rotary heat exchanger EQRB, L=3,4
Register Name Description Read/
write
Comment Min Max Default
4 x 0001 Setup Request to go into
setup mode/leave
setup mode. And write
to E2. The motor will
be switched off in this
mode.
Read/
Write
0. Exit SetupMode
1. Enter SetupMode
2. Write param to E2
Unsigned 0 2 0
4 x 0002 Dir Direction of rotation of
the motor
Read/
Write
0 = DIP value, 1= inverted
direction to the DIP switch
Unsigned 0 1 0
4 x 0007 Larm Reads out the applicable
alarm code/Reset of
the applicable alarm
code
Read/
Write
0 = Alarm reset
0 x 0001 Low voltage
0 x 0002 High voltage
0 x 0004 Snapped belt
0 x 0008 Motor blocked
0 x 0010 Sensor fault
0 x 0020 Cooling recovery
and defrosting
0 x 0040 High temperature
0 x 0080 DIP switch fault
0 x 0100 AWD
0 x 0200 Target speed
If several faults occur at the
same they are added together
Unsigned 0 65536 0
4 x 0008 Nd Dead band in the speed
signal (resolution 0.01
rpm)
Read/
Write
Unsigned 1 250 30
4 x 0029 Heat/cool Heat recovery max.
20 rpm
cooling recovery max.
25 rpm
Heating/cooling.
Reads/writes the appli-
cable operational case
Read/
Write
Not saved in the event of a
power outage
Unsigned 0 1 0
4 x 0030 Test Activate test mode Read/
Write
1= test mode, 0 = Normal
operation
Unsigned 0 1 0
4 x 0031 Relation The ratio between
the rotor and pulley
diameter
Read/
Write
Gearing ratio in the event of
DIP=62. Not saved in the event
of a power outage
Unsigned 0 65536
4 x 0033 Ctrl Control signal Read/
Write
0 -1000 ‰ Unsigned 0 1000 0
4 x 0034 Adress Modbus address Read/
Write
Activated through the DIP
switch. Not saved in the event
of a power outage
Unsigned 1 255 31
4 x 0035 Baud Data speed/100 Read/
Write
Activated through the DIP
switch. Not saved in the event
of a power outage
Unsigned 0 4 19200
4 x 0036 Par Parity (0=N, 1=E, 2=O) Read/
Write
Unsigned 0 2 0
4 x 0037 Stop Number of stop bits Read/
Write
0 -1 Unsigned 0 1 0
4 x 0038 Rst Factory reset Read/
Write
1 = Reset Unsigned 0 1 0
4 x 0039 Defrost Activate defrosting Read/
Write
1 = Activate Unsigned 0 1 0
4 x 0040 Purge time Purging time interval Read/
Write
Min Unsigned 0 65536 0
4x0043 belt test 1
time
Time interval before belt
test 1 in minutes
Read/
Write
Not saved Unsigned 0 65536 3
4x0044 belt test 2
time
Time interval before belt
test 2 in minutes
Read/
Write
Not saved Unsigned 0 65536 180
Table 2
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