11
VRT300 SERIES
POWER SUPPLY
The VRT300 control unit must be supplied with 230Vac
±
10% 50/60Hz. The VRT300 - U
control unit must be supplied with 12 Vac - Vdc 50/60Hz. According to the model purchased,
check the connection diagrams on pages 9 and 10.
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.
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 52-53 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 release without any trip 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 BAR 400 OR 600
The 400 and 600 bars are fitted with low current variation motors in case of a motor block.
To optimise the operation of
the VRT300 control unit with these bars, we recommend the alarm threshold is programmed at 5%.
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.
