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3.3. ELECTRICAL CONNECTION
The electrical connection of this unit is divided in two parts: actuators for the HATCH, and the motor of the FAN. For both
parts the diagrams provided inside their respective terminal boxes shall be followed.
Consider a recommended time to fan start of 30s after the cover has started to open.
HATCH
The HATCH cover is operated by two 220-240V IP65 actuators, which may indicate the fully open / fully closed position.
Remove the cover of the terminal box to carry out the connection as shown in the following diagram.
The SZ and SA contacts are for “open” and “closed” position respectively, for remote monitoring. Note these signal only
the fi nal position of the cover, not while in transition from one position to the next.
The Data B and Data A correspond to the communication bus.
Consider a normal open/close full cycle may take up to 3 minutes.
FAN
The terminal isolator box is supplied with a cable gland for typical electrical power cable connection, to assist ins-
tallation. However, if installer uses a cable requiring a differing cable gland, this is to be supplied by the Installer, no
alternative is offered by S&P. The Installer is responsible to ensure that cable, and cable gland, are suitable and safe for
application according to country regulations.
Ensure system operation is safe in event of power cut/power outage/disruption to power supply. If ventilation is stopped
due to disruption to power supply, ensure no risk due to excessive temperature (electrical heater). Care may be needed
when restarting fan after disruption to power supply.
Motor protection is to be provided by the installer.
Ensure the isolator is in OFF position before and after carrying out the connections, in order to prevent sudden activation
while the HATCH cover is closed. Carry out the connections following the wiring diagram affi xed to the inside of the box’s
cover.
The fan motor power supply must be designed to accommodate any motor protection devices, where applicable, for S1
duty cycle. Ensure these devices are fi tted and operating correctly.
However, for emergency smoke extract the fan is designed and certifi ed to run at the stated temperature and time, or to
destruction. Therefore, all motor protection devices must be disabled or bypassed under such event.
Power supply should be via a protected source to enable fan to run under emergency fi re smoke conditions. In case a
VSD is used for normal ventilation, it shall be bypassed in this scenario, leaving the fan in Direct on line supply. If the
VSD considered is included in the fan’s high temperature certifi cation, the bypass and Direct on line supply may not be
necessary.
Motors with speed control via Variable Speed Drive (VSD) Frequency Inverter, should not be run in excess of name-
plate speed. In general applications, we recommend not to run at less than 20% of nameplate speed without referen-
ce to manufacturer, since this may damage the motor. However, the fan shall not operate below 40% of its nominal
rpm (20Hz).
Consider the addition of sinusoidal or EMC fi lters depending on cable length from VSD to the terminal box.
