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Fan with control unit
without output control
Figure 21 shows the connection of an RP Ex fan without air out-
put regulation in a more complex air conditioner with a VCS-type
control unit (e.g. with air heating).
This connection method ensures full thermal protection of the fan
through thermistors and the VCS control unit, which is already
equipped with an ATEX certified thermistor relay from the factory.
The fans are always turned off and on by the control unit. Motor
protection must be ensured by the control unit by connecting the
thermistor terminals K1 and K2 to terminals 5a, 5a, 5b, 5b in the
control unit.
The air handling unit is started by the control unit. All protective and safety
functions of the fans and the entire system are provided by the VCS cont-
rol unit.
Fan with control unit
and output regulation
Figure 22 shows the connection of the RP Ex fan including the fan
power regulator in a more complex air conditioning device with a
VCS type control unit (e.g. with air heating).
This connection method ensures full thermal protection of the fan
through thermistors and the VCS control unit, which is already
equipped with a thermistor relay (with ATEX certification) from the
factory. The fans are always turned off and on by the control unit.
The protection of the motors must be ensured by the control unit
by connecting the thermistor terminals K1 and K2 to terminals
5a, 5a in the control unit. The internal fan power control is already
built into the control unit (configured) during its manufacture. The
connection of the speed controller mentioned allows the selection
of the fan power in stages "1" to "5".
In connection according to example D (or with a control unit), all
additional functions of the controller must be blocked by connecti-
ng terminals PT2 and E48 in the controller.
The air handling unit is started by the control unit. The regulator control
is built into the control unit. All protective and safety functions of the fans
and the entire system are provided by the VCS control unit.
C
D
RP fans * - * / * - ** Ex
Figure 21 – Fan connection
RP Ex
Zone 1
BNV
HMI
VCS control unit
(including ATEX certified thermal relay)
Figure 22 – Fan connection
Zone 1
BNV
VCS control unit
(including ATEX
certified thermal relay)
HMI
3× 400 V / 50 Hz
2,5 V=
2,5 V=
3× 400 V / 50 Hz
RP (
RP Ex
TRN–D
24 V=
15
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