INSTRUCTION MANUAL
for „DELTAFAN” wall fans of the type: ***/R/*-*/**/***/Ex
Page 9/14
During operation special attention should be paid to the following:
The access of cooling air from the motor housing cannot be hindered. The housing may have worse
conducting properties due to the sticking of dust and dirt particles to the fan surface. Therefore,
the housing surface should be periodically cleaned with a cotton cloth.
During the operation special attention should be paid to motor operation and immediately
disconnect the motor from the supply network in case of:
excessive motor vibrations,
considerable decrease of rotational speed,
excessive heating up of the motor or bearings.
4.6 THE POWER SUPPLY OF THE FAN MOTOR
The „DELTAFAN” wall fans of the type ***/R/*-*/**/***/Ex are equipped with asynchronous motors in the
explosion-proof version with certificates of EC type examinations (ATEX). In order to connect the device to the
electric installation, power supply cables or wires should be lead out through proper cable outlets of the motor
terminal box.
Power supply cables should be connected according to given diagrams and observing the following conditions:
The motors are designed for the basic voltage of 230/400V and can be connected to the network of the
inter-lead voltage of 3x400V ±5% with the star motor winding connection (Y) or to the network of the inter-
lead voltage of 3x230V ±5% with delta motor winding connection (Δ).
The installation must have correctly selected overload and short-cut protection.
The installation must have efficient protection against electric shocks.
Leads of the electric installation are to be lead through isolation bushings in the motor terminal box.
Authorised personnel should check whether lead dimensions are appropriate to the maximum consumption
of the electric power, but their cross-section should not be less than 1mm
2
.
The device should always be earthed. The fan operation without connected PE leads is forbidden. Protection
leads PE (should of colour yellow-green) should be connected to the terminal marked with the symbol.
Always make sure that the earthing lead is longer than the power supply lead so that it is the last lead in case
of accidental disconnection (tear out).
Before starting up the device, check the connections for correctness and consistency with the enclosed
electric diagram. Switching on the power supply without previous checking the connections is forbidden.
The explosion-proof motors of a standard reinforced construction do not have a thermal protection.
However, the motors can be additionally protected against overheating by means of three thermistors
(one for each phase) P-(TC)120-B connected in series, whose leads-out should be connected to an external
protection circuit or to an electronic resistance relay. When the set temperature is exceeded, the circuit
should disconnect the device from the power supply network. It is recommended that the protection
circuit accounted for the temperature growth caused by multiple fan motor start-ups.
