No. Designation
1 Mains terminal block
2 Motor terminal block
3 Priority potentiometer
4 Control terminal block
5 DIP switch
6 Test switch
7 Alarm terminal block
8 Operating mode indicator, model S
Fläkt Woods 3206 GB 03.01 1 Specifications are subject to alteration without notice
EU Air Handling Unit INSTALLATION
Rotary heat exchanger EURA, size 20–60 d = 7 and 9,
variable speed
Speed-controlled drive system manufacturer EMS Model
S for rotary heat exchanger EURA, size 20–60.
Page Content
1 Technical data
1 Units included . . . . . . . . . . . .Motor, Control unit
2 Operating mode indication . . .Diodes
2 Built-in functions . . . . . . . . . .Automatic forced air operation
Rotation sensor
Protection of control unit
Alarm relay
3 Control signals . . . . . . . . . . . .Control signals
Cooling recovery
Defrosting
Parallel operation
Priority switch
Manual control with 10Ω
potentiometer
4 Setting of DIP switch
4 Selection of max speed
4 In conjunction with shut-down
4 Test switch
5 Connection diagram
6 Maintenance / Troubleshooting
EMC, emission: EN 50081-1
EMC, immunity: EN 50082-2
Voltage: 1 x 220–240 V ±15%
Frequency: 50–60 Hz
Min. ambient temperature: –30°C
Max. ambient temperature: +40°C
Enclosure class: IP54
Alarm output: Alternating contact, max. 230 VAC, 5 A
may load the contact.
Control signals: 0–10 V, 2–10 V, 0–20 V
(phase section)
0–20 mA, 4–20 mA or via
potentiometer 0–10 kΩ
Soft start time: ca 30 s
Technical data
WARNING!
Residual voltage is present for 1
minute after disconnecting mains
voltage.
WARNING!
A circuit breaker must not be connec-
ted between motor and control.
Units included
The drive system consists of an enclosed control unit,
motor unit and a speed detector.
The control unit and motor unit are tested and
adjusted on delivery. No adjustments need to be made.
Rotation sensor, see page 2.
EURA 20–31 32–44 50–60
Rated current, regulator 0,7 1,3 1,5
External fuse 10 AT 10 AT 10 AT
Designation of regulator VVX 15 VVX 25 VVX 35
Fläkt Woods 3206 GB 03.01 2 Specifications are subject to alteration without notice
EU Air Handling Unit INSTALLATION
Protection of control unit
The control unit is equipped with overvoltage and under-
voltage monitoring of the mains voltage. At values
respectively above and below the mains voltage, the con-
trol unit is disconnected and the motor will stop. When
the mains voltage returns to its normal value, the motor
will start automatically.
The control unit has a built-in motor protector which
protects against overloading, and there is thus no need to
install external motor protection.
In the event of overloading the motor is disconnected
automatically.
To restart the motor the mains voltage must be inter-
rupted for ca 5 seconds.
A built-in short-circuit protection protects against
short-circuiting between the motor phases and between
the phases and earth.
Protection External alarm Restart Resetting
function after an alarm
Main fault,
Overvoltage
Main fault, Direct Automatic
undervoltage Automatic
Rotation alarm 20 min – min speed The motor
24 sek – max speed don’t stop
ca 8 tim – forced air
Motor protection Manual, break Manual, break
overload Direct and close and close
Short-circuiting mains mains
voltage voltage
Operating mode indication
Indication is given with two LEDs, one green and one
red.
Green Slow flashing - forced air operation / Low control signal
Rapid flashing – In operation, the motor is rotating continuously
Red Flashing – Rotation alarm
Lit constantly - Overload
Rotary heat exchanger EURA, size 20–60 d = 7 and 9,
variable speed
Automatic forced air operation
When the control signal drops below a specified value, as
shown in the table on page 3, the rotor of the heat ex-
changer will rotate ca 30° every ten minutes.
Speed detector
(Speed detector EURZ-02-2 is installed at the factory).
The speed detector checks that the rotor of the heat ex-
changer is rotating when there is a need for heat or coo-
ling recovery. One or two magnets, installed on the rotor,
actuate an impulse generator once every revolution.
If the drive belt fails and the rotor stops, the pulses will
cease and an alarm will be given. The motor will not
stop, but will continue to rotate regardless of whether an
alarm is given for no rotor rotation.
If it is wished for the motor to stop for all types of
alarm, including speed detector alarm, the mains voltage
can be locked externally when an alarm is received from
EMS-VVX. The time to an alarm is 20 minutes at mini-
mum speed and 24 seconds at maximum speed.
The speed detector also monitors during forced air
operation, although the time to alarm is then longer, ca 8
hours.
Connection details for the speed detector transducer
can be found in the connection diagram below, see also
page 5.
31 32 33 34 35 36 37
3 – 5 mm
41 42 43
Speed detector
Speed detector sensor
Pulse sensor
Speed detector
Magnet
Rotor
Built-in alarm
relay 42-43 closed
in the event of an
alarm
Alarm terminal block
Alarm
Alarm output
Control terminal block
Fläkt Woods 3206 GB 03.01 3 Specifications are subject to alteration without notice
EU Air Handling Unit INSTALLATION
Control signals
The drive system has a built-in linearization function
which gives a linear function between the control signal
and the energy efficiency of the VVX rotor. Instead of
the speed being proportional to the control signal. This
offers a good possibility of stable regulation.
Control signal Forced air From min to Max.speed
max.speed
0–10V 0–1,5 V 1,5–9,7 V >9,7 V
2–10 V 0–3 V 3–9,7 V >9,7 V
0–20V 0–3 V 3–19,4 V > 19,4 V
4–20 mA 0–6 mA 6–19,4 mA >19,4 mA
0–20 mA 0–3 mA 3–19,4 mA >19,4 mA
Operating mode of the drive system for different control signals.
Rotary heat exchanger EURA, size 20–60 d = 7 and 9,
variable speed
Cooling recovery
When cooling recovery is initiated by differential ther-
mostat EURZ-03-2, as shown in the connection diagram
below, see also page 5, the rotor of the heat exchanger is
increased to max. speed.
31
GT
32 33 34 35 36 37
Defrosting
Defrosting is initiated by the differential pressure regula-
tor, as shown in the connection diagram below, see also
page 5, which measures the pressure drop over the exhau-
st air side of the heat exchanger.
The control unit reduces the speed of the heat exchang-
er rotor to the set speed on the priority switch.
Parallel operation
Details of the parallel operation of several heat exchang-
ers can be provided on request.
31
GP
32 33 34 35 36 37
Priority switch
A predetermined speed can be specified by the potential-
free closing of priority inputs 34-35. When terminal
block 34 is closed to terminal block 35, the speed is con-
trolled by the priority potentiometer, which is located
next to the DIP switches in the control unit.
The priority switch has higher priority than the control
signal.
The switch can be used, for example, for cleaning the
rotor, defrosting with an external differential pressure
regulator and for manual control of the speed.
31 32 33 34 35 36 37
12345678
Manual control with 10 kΩpotentiometer
The drive system can be controlled manually with a
10 kΩpotentiometer, which is connected as shown in the
figure.
Cooling recovery
(Max. speed)
Jump 36-37
Diff. thermostat
Diff. Pressure regulator
Defrosting
(Min speed)
Jump
Control terminal block
Priority switch
Control terminal block
Priority potentiometer
DIP switch
33
34
37
10 kΩ
Control unit
Fläkt Woods 3206 GB 03.01 4 Specifications are subject to alteration without notice
EU Air Handling Unit INSTALLATION
Setting of DIP switch
Rotary heat exchanger EURA, size 20–60 d = 7 and 9,
variable speed
ON
1 2 3
ON
1 2 3
ON
1 2 3
ON
1 2 3
ON
1 2 3
ON
4
ON
4
ON
ON
7 8
7 8
ON
7 8
ON
6
ON
6
ON
5
ON
5
0-10V
10 kΩKilrem
Medurs
100%
80%
60%
Moturs
Plan
rem
2-10V
0-20V
4-20mA
0-20mA
JA
NEJ
Styrsignal Remtyp
Rotationsriktning
Maximalt varvtalRotationsvakt
Choice of max speed
The maximum speed can be restricted to 80% (200 rpm)
or 60% (150 rpm). This function is intended essentially
for use with rotors smaller than ca 1.3 m when it is
wished to restrict the max speed and/or when larger belt
pulleys are used.
In conjunction with shut-down
When it is wished to switch off the heat exchanger rotor
at night, for example, this can be effected by a relay in
series with the control signal which interrupts the signal
to control signal terminal block 33. In this way no alarm
will be given due to mains interruption. The control sig-
nal can also be reduced to its lowest value for the same
function.
31 32 33 34 35 36 37
In conjunction with shut-down
Instead of interrupting the mains
voltage it is recommended that the
control signal is interrupted as
shown in the figure. No alarm will
then be given due to a mains fault.
Test switch
The control unit is equipped with a test switch located
under the cover between terminal blocks 37 and 41. In
the “ON” position, the motor soft-starts and runs up to
its maximum speed regardless of other signal sources. In
the “OFF” position (downwards), the test change-over
switch is disconnected. See also page 1.
31 32 41 42
OFF
ON
Test switch
Control terminal block Alarm terminal block
Control terminal block
Plan
belt
V-belt
Belt type
Control signal
Direction of rotation
Clockwise
Anti-
clockwise
Maximum speedSpeed detector
YES
NO
Alternative control signals, see also pages 3 and 4
In conjunction Defrosting Potentio- Prio. Max. Cooling
with shut-down meter speed recovery
Fläkt Woods 3206 GB 03.01 5 Specifications are subject to alteration without notice
EU Air Handling Unit INSTALLATION
Connection diagram
Rotary heat exchanger EURA, size 20–60 d = 7 and 9,
variable speed
Mains connection
Connection must be carried out by a qualified electrical
contractor.
Mains connection 1 x 220 –240V is performed as
shown in the connection diagram
above and is protected as shown in the table on page 1.
A safety cut-out must be installed in the incoming sup-
ply before the control unit. When the mains connection
is disconnected an alarm will be given for voltage failure.
The control unit has a built-in motor protector, and no
external motor protector needs to be installed.
The control unit is not protected against short-circuits
or earth faults in the cable between the control unit and
the motor. Such faults lead to immediate breakdown. You
should thus always check with an ohmmeter that no
short-circuits or earth faults are present before switching
on the mains voltage.
A safety cut-out must not be installed between the con-
trol unit and the motor.
To prevent an alarm, when the supply voltage to the
control unit fails or is disconnected, the alarm signal
must be locked via an external breaking contact.
31 32 33 34 35 36 37 41 42 43
123456
LN
N
L
0
1
1 x 220–240 V
M
+–
Model S Alarm relay
42-43 closed
in the event
of an alarm
Alarm terminal
block
Control terminal
block
Motor terminal
block
Mains terminal
block
Alarm output
3)
Control signal
Speed detector
sensor
2)
1)
Safety cut-out
External fuse,
10 AT
L, L1, L2 = Phase
N = Neutral
33 34 37
34 35
33 34 34 35 36 37
GT
36 37
GP
GP- Differential pressure regulator for defros-
ting operation. If the pressure regulator is
omitted, the control signal must be connected
directly to the terminal block.
Potentiometer
10 k Ω, linear
Priority contact
Potential-free
Potential-free
GT- Differential pressure regulator for
cooling recovery.
1) The screen is connected to the control unit. Motor wiring.
NOTE! The direction of rotation of the motor cannot be changed by rever-
sing conductors in the motor wiring, see DIP switch page 4.
2) Impulse generator of magnet type.
NOTE! An inductive generator must not be connected, see also page 2.
3) Closing contact in the event of an alarm. Max. 230 VAC, 5.0 A, see also
page 2.
Alarm indications
S Fault Reason for fault
Green Forced air/ Check EMS-VVX by operating the drive system with
long low control the test switch next to terminal block 37. The motor
lights signal must and run up to its maximum speed. If the
motor runs up to test switch the fault is external.
Can 0–10V (2–10V) be measured between
33 (+) and 34 (-)? Is + and – shifted?
Red Rotations VVX the rotor remains stationary. Check the drive
flash- alarm belt. The rotor rotates. Check that the rotation
ing sensor is correctly installed, see page 2.
Measure the voltage between terminal blocks 33
and 34. When the magnet actuates the sensor,
the voltage must be < 1V, and when the magnet
does not actuate the sensor, the voltage must be
>11V, if this is not the case, replace the rotation
sensor.
Red Overload/ Motor protector has tripped due to high loading.
lights motor Check that the motor cables are correctly con-
protector nected, see Chapter Connection.
If the drive system operates for longer periods,
the loading can be too high, check that the rotor is
not seized and that the diameter of the rotor and
belt pulley is not excessive.
If the fault persists, perform motor measurement,
see below.
Replace the motor if it is defective. If the motor is
faultfree, replace the control unit.
No Missing Check that a 230 VAC ±15% supply is connected
LED main voltage to the mains terminal block.
lights Overvoltage Mains voltage exceeds 264 VAC
Undervoltage Mains voltage below 196 VAC
Short-circuiting Break mains voltage, check motor cable connection
in the motor and that the right motor is connected.
Interruption in If the fault persists, perform motor measurement,
one or two see below.
motor phases Replace the motor if it is defective.
Interruption of If the motor is fault-free, replace the control unit.
all three
motor phases
Fläkt Woods 3206 GB 03.01 6 Specifications are subject to alteration without notice
EU Air Handling Unit INSTALLATION
Rotary heat exchanger EURA, size 20–60 d = 7 and 9,
variable speed
Maintenance / Troubleshooting
WARNING!
Test- and DIP switches must only be
reset after the mains voltage has been
disconnected.
Maintenance
The motor and control unit are normally maintenance-
free. However, you should check regularly that the wiring
is fault-free and that all fixing screws are properly tighte-
ned.
Troubleshooting
Check that the installation is correctly executed, e.g. that
the cables are properly insulated, that there are no loose
cables, etc and that the DIP switches are correctly set.
WARNING!
A residual voltage remains for 1
minute after disconnecting the mains
voltage.
Motor measurement
Switch off the mains voltage. Disconnect the motor
cables from the control unit. Measure the motor resistan-
ce between 1–2, 3–4 and 5–6.
It must be:
EMS-VVX 15M; 30–90 Ohm
EMS-VVX 25M; 5–15 Ohm
EMS-VVX 35M; 5–15 Ohm
The resistance must not differ by more than 5 Ohm
between the phases for 15M and by no more than 2 Ohm
for 25M/35M
Also check the insulation between 1–3, 1–5, 3–5, 1-
earth, 3-earth and 5-earth.
It is always possible to test the operation of the drive
system with the TEST switch under the cover next to ter-
minal block 37. The switch has two fixed positions, in
the up position the motor will run up to its maximum
speed, and in the down position the speed is controlled
by the control signal.
If the motor fails to run up to its maximum speed or to
respond to the control signal, check DIP switches 1–3
and 7 and 8.
If the heat exchanger rotates in the wrong direction,
DIP switch 6 must be reset.
When replacing the control unit, the entire enclosed
box with the circuit board must be replaced.
/