Hoval A 60 - Control Unit

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4.2 Control unit
Structure
A frequency converter with a modular design is used as the
control unit; it can adjust the speed of three-phase motors
innitely. Protection rating IP 54 is required for installation in
the ventilation unit. The power unit is protected from under-
voltage, overvoltage or non-approved converter temperature.
The aluminium casing and the standard input and output
lters increase the immunity to interference. Error messages
can be read out directly at a ashing LED.
The control unit is delivered ready for operation with the
factory-set parameters. Various settings can be changed with
an optionally available operating unit.
Function
■ The control unit can be used for condensation, enthalpy
and sorption wheels that require speed control. All
standard control signals are accepted.
■ A quadratic (standard) or linear implementation of the
setpoint into the rotary eld frequency based on the
maximum frequency of the selected parameter set is
used.
■ As soon as the input signal is below the dened threshold
value, the wheel stops rotating. After an adjustable holding
time intermittent operation is started and the wheel rotates
at the dened speed for a few seconds.
■ An inductive sensor can be connected for speed moni-
toring (option D).
■ Readiness for operation and any fault messages can be
output via a relay.
System design
■ The control unit is not designed for outside installation.
■ The control unit is normally installed in the side wall of the
casing.
■ The normal installation position is vertical. Sufcient venti-
lation for heat dissipation is essential.
Fig. 17: Control unit R
Installation
Caution
All work for transport, installation and commissioning
as well as maintenance is conducted by qualied
technicians (note IEC 364 and VENELEC HD 384 or
DIN VDE 0100 and IEC Report 664 or DIN VDE 0110
and national occupational health and safety regula-
tions or VGB 4).
Qualied technicians as dened by the basic safety instruc-
tions are persons who are familiar with the setup, installation,
commissioning and operation of the product and are appro-
priately qualied for their activities (dened in IEC 364 or DIN
VDE 0105).
Commissioning
■ Before commissioning the control unit the rotary heat
exchanger must be operating correctly.
■ The direction of rotation of the wheel can be changed by
reversing 2 phases of the motor.
■ A green LED lights when the unit is operating without
faults.
■ Causes of faults are displayed on the control unit.
Options