12 - EC FAN MOTOR ASSEMBLIES
12.1 - EC motor protection
■ These motors feature integrated protection and monitoring devices. They are protected against thermal overload of the electronic
components and motors, and against any failure of the Hall effect sensors to analyse the position of the rotor.
■ These faults are indicated by a change of state in the KL2 fault relay (terminals COM-NO-NC). This is a potential-free changeover
relay, with a breaking capacity of 2 A/250 VAC cos phi = 1.
■ List of faults:
- In the event of a thermal overload on the motor/electronic controls, or a Hall effect sensor fault:
The fan stops and cannot be restarted. The fault is indicated by a change of state on the KL2 relay. The fan can only be restarted
by powering off for 20 seconds then powering back on again (after the source of the fault has disappeared, otherwise the cycle
restarts).
- Rotor blockage:
In the event of accidental rotor blockage, the fault is indicated by a change of state on the KL2 relay. When the blockage is
cleared, the fan automatically restarts.
- Under voltage:
The motor accepts a nominal voltage/frequency range of 380 to 480 V/50 to 60 Hz with no notable modication to a handling
performance. Between 380 and 290 V, the fan continues to operate with degraded performance. If the voltage drops below 290
V for 5 seconds, the motor stops. The fault is indicated by a change of state on the KL2 relay. The motor will restart when the
voltage returns to its nominal value.
- Absence of phase:
If one of the 3 phases is absent for more than 5 seconds, the motor stops. The fault is indicated by a change of state on the
KL2 relay. The motor will automatically restart 10 - 40 seconds after the 3 phases return. Phase inversion has no effect on the
direction of rotation of the motor.
12.2 - Fan with EC motor (3-ph 380 V to 480 V 50/60 Hz)
■ On a 3-ph/380-400 V/50/60 Hz network, EC motors will have different rotation speeds depending on the control signal.
Impeller diameter (mm) 910 800
Supply voltage 3-PH/380 - 480 V/50/60 Hz supply
Control signal 0/10 V or 4/20 mA
Motor type E9A E9B E8A E8B E8C
Max. speed(s) rpm 1000 1100 740 510 700
Weight of impeller + motor kg 25 - 20 9 -
Weight of fan motor assembly kg 65 45 40 38 26
Min. room temperature for storage °C -40
Min. operating temperature °C -25 -35 -25 -40 -35
Insulation class F
Sealing class IP 54
Number of starts Max. 50 / hour
13
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