10
VRT600 SERIES
POWER SUPPLY
The VRT600 control unit must be supplied with 85-250Vac 50/60Hz.
A variation in the network voltage of over 10% might cause alarms because of the current variation in the load.
If the electrical system is affected by harmonic frequencies, alarm warnings might be triggered because of the
consequent variation in the current absorbed by the motors.
It is good practice to make sure that the level of system harmonics is not such as to cause malfunction or damages to
all the connected electrical and electronic instruments, in compliance with the regulations in force for the type of
system.
When the control unit is powered directly by the secondary of the transformer to be protected, it can be burnt out by
high intensity overvoltages.
These problems occur if the main switch is closed and the transformer does not have the load (no load test).
The above is much more evident when the 220 Vac voltage is taken directly from the bars of the secondary of the
transformer and there is a fixed capacitor battery for power factor correction of the transformer itself.
OPERATION
When switched on, the device carries out a LAMP TEST and is set either in REMOTE or LOCAL mode, according to how
it was set before being switched off.
In REMOTE mode the fans are activated when contact 60-61 closes, which must be connected to the FAN contact of
the temperature control unit.
In LOCAL mode the fans are activated by pressing the <START-STOP> button. The status of operation is stored in
case of power failure.
HOW TO CHECK THE ALARM STATUS
−
Running LED OFF:
no ventilation activation control
−
Running LED ON:
REMOTE or LOCAL ventilation activation
−
Over- and under-current LEDs OFF:
motor operating correctly
−
Over-current LED ON:
motor stopped due to over-current
−
Under-current LED ON:
motor w under-current alarm signal
−
Under-current LED flashing:
motor disconnected while auto-tuning
−
Over-current LED ON:
motor consumption >5.5A (immediate trip without any delay)
−
All LEDs flashing:
corrupted memory error (ech); press reset and repeat the programming procedure
N.B.:
A motor in a state of alarm or the interruption of supply to the device make contacts 8-9 of the FAULT relay
close.
HOW TO RESET A MOTOR IN ALARM
To reset an alarm due to under-current or over-current, press the RESET button after carrying out the necessary
checks and any repairs might be required.
OPERATION WITH FANS NOT TECSYSTEM
The proper functioning of the VRT unit is guaranteed only for: fans with current absorption between 250mA (IN MAX
20%) or 300mA (IN MAX 30%) and 5A, single phase, single speed and power variation is not greater than ± 10%.
IMPORTANT NOTE: if an existing control unit must be replaced with a new one, to guarantee its
correct and safe operation, all the connecting terminals must be replaced with the new terminals supplied,
on condition the brand of the new terminals is different from the one of the previously installed ones