Ventilation technology » Ziehl-Abegg motor protection concept
15.04.2008
Do you already know the advantages of the Ziehl-Abegg motor protection concept?
Ziehl-Abegg external rotor motors, 74mm diameter and above, (except explosion-proof versions), are equipped as standard with thermal sensing switches (denoted ‘TB’) embedded in the motor windings. These thermal sensing switches serve to detect critical winding temperatures during operation, for example in motor overload situations.
This benefit enables the reliable protection of your Ziehl-Abegg fan against damage, even if critical operating conditions should occur. For monitoring these thermal sensing switches, Ziehl-Abegg offers a range of special motor protection contactors.
More about the Ziehl-Abegg motor protection concept...
Commercially available motor overload relays simply disconnect the motor power supply in an overload situation. In contrast, Ziehl-Abegg motor protection contactors, besides providing motor protection by monitoring the actual winding temperatures, offer a wide variety of further options.
The advantages of the Ziehl-Abegg motor protection contactors are:
Direct interpretation of a high winding temperature condition by monitoring the integrated thermal sensing switch “TB”.
Integrated power cable protection function (fuse function) by over-current tripping which is configurable based-upon cable current carrying capacity (cable cross section) (3 phase units only).
Integrated dual clamp terminals enabling the connection of two conductors per terminal, in turn enabling the parallel connection of two fans per motor protection contactor (3 phase units only).
Integrated manual on/off push buttons, with optional lockable isolation switch for use during repairs/maintenance.
Remote ‘run’ and ‘fault’ indication via optional auxiliary contacts (denoted ZB).
Application example:
3 phase motor contactors distributing power from a high performance controller to multiple motors:
Our system concept however extends beyond separate installed motor contactors :
To simplify installation, Ziehl-Abegg developed a complete power distribution system, pre-wired and equipped with motor protection contactors.
Only the incoming power cable (usually from the controller output) and the fan power distribution cables have to be connected to this complete system. The fan power distribution cables are connected directly to the terminals of motor protection contactors. When using the 3 phase motor protection contactors, the integrated dual clamp terminals enable 12 fans to be powered via 6 motor protection contactors. The power distribution panel is IP54 rated.
Pre-wired 80A power distribution panel with integrated motor protection contactors. Also available with mains isolation switch.
Do you already know the advantages of the Ziehl-Abegg motor protection concept?
Only the incoming power cable (usually from the controller output) and the fan power distribution cables have to be connected to this complete system. The fan power distribution cables are connected directly to the terminals of motor protection contactors. When using the 3 phase motor protection contactors, the integrated dual clamp terminals enable 12 fans to be powered via 6 motor protection contactors. The power distribution panel is IP54 rated.
