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11.7. ELECTRICAL CONNECTION
Electrical connections of elements of the unit equipment should be carried out by properly qualified
and authorized personnel in accordance with standards and regulations valid in a country of
the device installation. Sections and types of cables (e.g. screened cables) feeding the individual
functional equipment components should be selected according to current rating and conditions
specific for the unit location (e.g. ambient temperature, method of cable installation, distances from
the power cubicle). Before connecting the power supply make sure the voltage and frequency values
of the mains are compatible with the data given on data plates of the devices. Admissible tolerances
in values of the supply voltage and its frequency in relation to the values given on the data plate are
±5%. If any incompatibilities are found, do not connect the devices.
11.7.1. ROTARY HEAT EXCHANGER
The rotary heat exchanger is driven by a drive unit comprising a gearmotor and a frequency
converter. The drive unit can be connected to a standard 0-10V control signal. Frequency converter
is powered by 1~230VAC/50Hz. Rotary speed control signal (0-10V) should be connected with a
two-wire screened control cable.
11.7.2.
FAN MOTOR
In OPTIMAX air handling units it is possible to install fans with
asynchronous - AC or electronically
commutated - EC motors
. Depending on the size, units are equipped with one or two fans for the
air supply and exhaust, respectively. Parameters are given for a single fan.
Asynchronous - AC
motors of fans can be used in dusted and humid environments (IP54), and
their insulation (F class) is suitable for operation with frequency converters. No additional means to
provide protection of the motor against conditions in the fan section are required. Fan motors with
direct drive as standard are supplied from frequency converter with 3-phase voltage. 3~400V/50Hz
motor windings should be connected to corresponding terminals of the frequency converter.
Connection should be done through short-circuit protection for rated current of the motor type
used. Overload protection should be implemented on the frequency converter by activating specified
rated parameters of the motor in accordance with manual delivered with the frequency converter.
When supplying the motor from the frequency converter, currents of high frequencies or harmonic
components of voltages in motor powering cables may cause electromagnetic interferences.
Connection between the frequency converter and the motor should be carried out using screened
cables, in accordance with the guidelines as given in the frequency converter’s Operation and
Maintenance Manual (DTR). Before commissioning and after a long storage or idle period, make
sure to measure the insulation resistance between the casing and the windings, by applying direct
current. Minimum insulation resistance for a new, cleaned or repaired winding should be 10 Ω in
relation to earth.
Rated parameters for single fans with
asynchronous - AC motors
Unit size
Air supply
Air exhaust
Power
[kW]
Current
[A]
Voltage
[V]
Number of
fans
Power
[kW]
Current
[A]
Voltage
[V]
Number of
fans
OptiMax-10
1,1
2,4
400
1
1,1
2,4
400
1
OpitMax-20
3,0
6,0
400
1
2,2
4,53
400
1
OptiMax-30
2,2
4,53
400
2
1,5
3,19
400
2
OptiMax-40
4,0
7,83
400
2
3,0
6,36
400
2
OptiMax-50
5,5
11,1
400
2
4,0
8,3
400
2
