OJ Electronics Air2EC Instructions Manual

I N S T R U C T I O N S
OJ Air2EC
67010A 03/14 - (OSH)
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English
LIST OF FIGURES
The following figures are located at the back of
the instructions:
Figure 1: Dimensions OJ Air2EC 1080D –
3240D
Figure 2: Dimensions OJ Air2EC 3400D –
3650D
Figure 3: Installation orientation externally on
duct
Figure 4: Installation orientation internally in
duct/unit
Figure 5: Connecting the hand terminal
(OJ EC HTERM)
Figure 6: Connection to OJ Air2 Fan IO
Figure 7: Electrical connection of OJ Air2EC
1080D – 1115D
Figure 8: Electrical connection of OJ Air2EC
3160D – 3650D
Figure 9: Overview of terminals
Figure 10: R elationship between speed and
setpoint
Figure 11: R elationship between speed and
ramp up/down
Figure 12: C onnections in RJ12 communication
sockets A & B
Figure 13: Connecting the cable screen to the
EC Controller
Figure 14: Cable entry in OJ EC Controller
INTRODUCTION
The OJ Air2EC Controller is used to control the
speed of an EC-motor mounted on a fan.
The OJ Air2EC Controller utilises the latest and
most energy-efficient form of control for EC-
motors. Sinusoidal field oriented control (FOC)
ensures that the magnet fields within the motor
are optimally controlled at all times. All the
magnetic energy is utilised to generate rotation
and nothing is lost through friction in the bear-
ings. The technology ensures that the EC-motor
operates with least possible energy consump-
tion throughout its operating range. Compared
to other control forms, e.g. trapezoidal, the
overall efficiency of motor and controls can be
improved by 3-10%.
Sinusoidal current delivers smooth torque and
ensures quiet operation.
The EC Controller is installed in the ventilation
air flow itself and is therefore designed to meet
all environmental requirements on ventilation
ducts. The electronics are unaffected by heat,
cold, moisture, dust and vibration as they are
moulded into a sturdy aluminium enclosure. The
EC Controller takes up very little space when
mounted on the fan motor frame.
The OJ Air2EC Controller has an ingress protec-
tion rating of IP54.
To allow the removal of surplus heat from the
EC Controller, the cooling fins must always be
exposed to active ventilation, e.g. in an extract
or inlet duct.
The OJ Air2EC Controller is controlled via
RS485 Modbus RTU and can thus be fully inte-
grated with the OJ Air2 system. Operating and
range parameters can easily be adjusted for the
application concerned via Modbus. It is always
possible to control the EC Controller manually
from the hand terminal.
All electrical connections are safely and reliably
made by means of spring-loaded terminals.
Modbus RTU is connected via RJ12 sockets
in the OJ Air2EC Controller. The OJ Air2EC
Controller features a built-in EMC filter.
PRODUCT PROGRAMME
TyPE PRODUCT
OJ Air2EC-1080D EC Controller 0.8 kW / 1x230 V AC
OJ Air2EC-1115D EC Controller 1.15 kW / 1x230 V AC
OJ Air2EC-3160D EC Controller 1.6 kW / 3x400 V AC
OJ Air2EC-3240D EC Controller 2.4 kW / 3x400 V AC
OJ Air2EC-3400D EC Controller 4.0 kW / 3x400 V AC
OJ Air2EC-3650D EC Controller 6.5 kW / 3x400 V AC
FUNCTION
The EC Controller is designed to control the
speed of an EC-motor used in conjunction with
a fan. In principle, an EC-motor is a brushless
DC motor in which commutation is electroni-
cally controlled. The rotor is equipped with per-
manent magnets. The EC Controller constantly
changes current direction, thus causing the
motor to rotate. Depending on the motor output,
mains voltage requirements are either 1-phase
230 V AC or 3-phase 400 V AC.
FEATURES
As standard, the OJ Air2EC Controller has the
following built-in features:
• M odbus RTU
• F lying start in both directions
• A larms for overload, over-voltage and under-
voltage
• M otor protector with built-in current limiter
• S hort-circuit protected EC Controller outputs
INSTALLATION
Installing OJ Air2EC
To ensure sufficient cooling of the OJ Air2EC
© 2014 OJ Electronics A/S
Controller, it must be installed in such a way as
to allow the fan air flow to pass across the cool-
ing fins. There must also be free air passage
between the fins. The OJ Air2EC Controller can
be installed inside the AHU or directly on the
motor console. The OJ Air2EC Controller can
also be installed through the wall of an inlet or
extract duct with the cooling fins positioned in
the active air flow within the duct (figs 3 and 4).
If necessary, the EC Controller can be fitted to
a mounting plate, allowing free access to the
cable entries of the EC Controller (fig. 14).
Connecting the motor leads
The screened motor cable should be led into
the OJ Air2EC Controller through the cable
entry, which is equipped with a rubber seal. Se-
cure the motor cable and connect the screen to
earth using the strain relief cable clamp located
beside the cable entry (fig. 13). Using screened
cable, the motor coil leads must be connected
to terminals "U", "V" and "W" on the terminal
strip marked "MOTOR" and the protective earth
wire must be connected to (figs 7 and 8).
Connecting the power supply
The power cable should be led into the OJ
Air2EC Controller through the cable entry, which
is equipped with a rubber seal. Secure the
motor cable using the strain relief cable clamp
located beside the cable entry.
With sizes OJ Air2EC 1080D and OJ Air2EC
1115D, which are both 230 V models, power
must be connected to terminals "L" and "N"
on the terminal strip marked "Mains", while the
protective earth wire must be connected to
(fig. 7).
With sizes OJ Air2EC 3160D to OJ Air2EC
3650D, which are all 3x400 V models, power
must be connected to terminals "L1", "L2" and
"L3" on the terminal strip marked "Mains", while
the protective earth wire must be connected to
(fig. 8).
The power cable need not be screened.
Connecting the hand terminal
The hand terminal (OJ EC HTERM) should be
connected to the OJ Air2EC Controller via the
RJ12 socket marked "A" (fig. 5). The hand
terminal cable should be led into the OJ Air2EC
Controller through the cable entry, which is
equipped with a rubber seal. Secure the hand
terminal cable using the strain relief cable clamp
located beside the cable entry.
Connecting Modbus
The Modbus cable from OJ Air2 Fan IO should
be led into the OJ Air2EC Controller through the
cable entry, which is equipped with a rubber
seal, and inserted into the socket marked "B"
(fig. 6). Secure the Modbus cable using the
strain relief cable clamp or 3-point relief system
located beside the cable entry.
If the Modbus cable is NOT connected to an OJ
Air2 Fan IO, the Modbus socked marked "B"
must be used and the EC Controller must be
addressed via the terminals marked "Adr.Pin1"
and "Adr.Pin2" (see section on "Modbus" and
fig. 12).
The Modbus communication cable must be of
type MPFK6S or similar flat cable to which an
RJ12 connector has been fitted on both ends
using a special tool.