A skilled qualified electrician has to select the correct
cable types and sizes.
DANGER!
Danger of electric shock! Do not touch any live com-
ponents! Electrical equipment carries a dangerous
electrical voltage.
–
Only skilled qualified electricians are allowed to
work on the electrical system.
–
Switch off the power supply before working on
any electrical equipment.
Connect the actuator to the explosion-proof ter-
minal box as indicated on the actuator or in the
manufacturer's product documentation.
Explosion-proof electric actuators
Fig. 34: 2-wire control
①
Wire link between terminals 2 and 5: Spring return
~3s (only ExMax15-SF)
S1 open and S2 open: Actuator has stopped (any posi-
tion)
S1 closed: Direction of rotation 1
S1 open, S2 closed: Direction of rotation 2
Fig. 35: Terminal connections in terminal box Ex-Max15-
SF
1
⊥
, –
2
~, +
3
Control voltage for direction of rotation 1
4
Control voltage for direction of rotation 2
5
Input for 2–5 wire link, spring return
∼
3s
6
Common contact
7
Mechanical stop 1 < 5°
8
Mechanical stop 1 > 5°
9
Common contact
10 Mechanical stop 2 < 85°
11 Mechanical stop 2 > 85°
If both auxiliary switches are used, then the switching
voltages must be the same.
Fig. 36: Terminal connections in terminal box Ex-Max30-
SF
1
⊥
, –
2
~, +
3
Control voltage for direction of rotation 1
4
Control voltage for direction of rotation 2
5
Common contact
6
Mechanical stop 1 < 5°
7
Mechanical stop 1 > 5°
8
Common contact
9
Mechanical stop 2 < 85°
10 Mechanical stop 2 > 85°
If both auxiliary switches are used, then the switching
voltages must be the same.
Limit switch
Fig. 37: Connecting cable core identification for limit
switch
1
Common contact
2
NC contact
4
NO contact
5.6.3 Fans used with a frequency inverter
Installation:
Make sure that the fan motor allows for connection
to a frequency inverter.
Install the frequency inverter outside the Ex zone.
Use shielded cables to connect the fan motor to the
frequency inverter.
Use one of the following protection systems for the
fan (careful - explosion hazard!):
–
PTC thermistor
–
Temperature sensor
–
Overcurrent protection device
These systems are the only way to ensure that the
motor is immediately switched off in case of a fault
(e.g. from a bearing, winding).
Installation
Connecting the air handling unit to the power su... > Fans used with a frequency inverter
Air handling unit X-CUBE Ex
42
