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8.2.2 EC fan
All EC fans have integral overload protection; no upstream motor protection
device is therefore needed.
The motor junction box includes a potential-free normally closing contact
250 V/2 A wired to terminals that acts as an alarm contact. This signals an
error message from the fan or a power failure.
8.3 Electrical connection
Damage can be caused by the use of incompatible switching devices and
inadequate safety devices. The manufacturer does not accept any warranty
in these cases.
Only connect up units with a circuit breaker that switches off all poles from
the mains power supply with a contact gap of at least 3 mm!
8.3.1 AC three-phase motor
The three-phase external rotor motor can be switched between 2 stages
using a 2-stage three-phase switch (Y/Δ configuration). The motor in each
of the two switching configurations (Y or Δ) can be switched between
5 stages by voltage reduction using a 5-stage three-phase controller or
KaControl AC recirculating air control electronics, type 3231200.
Switching stage 1
Switching stage 2
The fans are operated with a clockwise rotating field!
Important! Operation of this unit on frequency converters is only permitted
if the frequency converter has a sine filter effective on all poles. Missing sine
filters can lead to severe thermal damage to the fan motor. In this case, the
manufacturer accepts no warranty.
Three-phase parallel connection
• Several ProtecTor units, even of different sizes, can be connected in par-
allel to a stage switch providing the switching power of the stage switch
is not exceeded.
• The thermal contacts of all ProtecTor units must be switched in series.
• We recommend the use of intermediate terminal boxes if several
ProtecTor units are connected to a stage switch.
ProtecTor
A new dimension in door screening
Installation and operating manual
Y-connection
Delta connection
2.55
25
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