Motor Protection - Nicotra Gebhardt RLM E3 Betriebsanleitung

BA-REF 6.2 - 05/2021
EN-10/26
5.3.3. RHM 31/F1
Centrifugal roof fan, horizontal discharge, with standard IEC motor,
galvanised sheet steel cowl and structure.
Outlet guard conforming to DIN EN ISO 13857.
5.3.4. FDM F1
Centrifugal roof fan, highly noise-attenuated design, vertical discharge, with
standard IEC motor, galvanised sheet steel casing and structure
Outlet guard conforming to DIN EN ISO 13857

5.4. Motor Protection

5.4.1. Models RDA 21
The motors used in RDA 21 models are fitted with thermal contacts.
With single-phase motors drawing up to max. 2.5 A the thermal contacts are
connected in sequence externally with the winding.
They switch the motor off automatically when it has reached a set maximum
temperature and switch it back on again automatically when it has cooled
down. In all other motors the winding temperature is monitored by thermal
contacts in combination with a motor protection unit or a contactor assembly.
5.4.2. Models RVM / RHM / FDM / RDM
Motors of the RVM / RHM / FDM / RDM - 4D/43/63 series are equipped with
PTC thermistors as standard.
In conjunction with a PTC thermistor triggering device, the PTC thermistors
protect the motor from overload.
The motors used in the variable-speed models RDM - BI/4P/4F/6P are
protected against overload by frequency inverter. The frequency inverter
reacts with a speed reduction up to switch the motor off.
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