GEA CAIRplus - CS Klimateknik

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Electrical ConnectionGEA CAIRplus7.1.1 Cable routing and grommets by others• The installation of cable grommets and the routing of cables near doors,panels with sash fasteners, panel connections and cover strips must beavoided.• Screw connections and grommets must not cause any leaks.• The connecting cables within the fan components must be long enough toallow the motor to be moved without difficulty (in order to re-tension the V-belt,for example).7.2 Connecting the unitEach subassembly with an electrical connection must be earthed separately.7.2.1 Motor protectionMotor protection with PTC resistor sensorsThe AC motors contain between two and six PTC resistor sensors connected inseries, depending on the motor size and type. The PTC resistor sensors areembedded in the windings of the motors in a way that optimises recording of thewinding temperature. PTC resistor sensors are temperature-dependentsemiconductor resistors.When the maximum permissible winding temperature of 135 °C is reached, theresistance value increases rapidly. This response, combined with full motorprotection electronics, causes the motors to switch off.NOTEUnlike thermal contacts, PTC resistor sensors are not subject to wear. Theyprovide a high degree of operating safety as they are shock-resistant, vacuumresistantand not sensitive to pressure.DAMAGE TO THE UNIT!The separate sensor with external leads must not be connected to voltage asthis would damage it beyond repair. Measuring voltages greater than 5 V arenot permitted.Connect the sensor only to full motor protection tripping devices (such asGEA 912.MVS 1.0).INDUCTION EFFECTSWe recommend the use of shielded cables (such as JY (st) Y, 2 x 2 x 0.5) toprevent the effects of induction on the PTC resistor measuring circuit. Connectthe shielding on one side with the potential equalisation (PE).44 PR-2009-0096-GB • Subject to modifications • Status 07/2010
GEA CAIRplusElectrical ConnectionFull motor protection electronicsOperating point oftripping deviceFor motor protection we recommend our GEA 912.MVS 1.0 full motor protectiontripping devices. They have been specially harmonised with the PTC resistorsensors used in the motors. As operation of the full motor protection electronicsis based on the closed-circuit current principle they are intrinsically safe. A lockingshutdown after a fault and restart following power failure generally occur inconjunction with GEA 912.MVS 1.0 full motor protection tripping devices.Resistance RTemperature T+135 CThe electronic full motor protection tripping devices switch the motors off wherethe following occur:– Overloading– Ambient temperatures exceed permissible limits– The rotor is locked– Insufficient cooling– Short circuit in winding– Wire breakage and loose contacts in the measuring leadsExtended motor protectionShutdown after faultIn the case of a high start-up frequency, intermittent operation and switching rate,and to provide optimum protection against 2-phase running, we recommend thatmotors are protected by thermal overcurrent relays/motor circuit breakers, inaddition to PTC resistors.In the event of a shutdown after a fault check whether this is due to one of theaforementioned causes.Motor protection with thermal contactThermal contacts are temperature-dependent operation elements that automaticallymonitor the winding temperature of a motor. Compared to thermal trippingdevices and motor circuit breakers, these devices provide more effective protectionunder the following circumstances when installed in the motor winding:– Insufficient cooling– Increased ambient temperature– Extreme speed reduction during control and regulation operations– Shutdown of the motor in the event of control voltage failure on the line side– Faulty contacts and cable breakages in the control circuit.The thermal contact opens when the permissible temperature of the winding isexceeded. This interrupts the control signal loop of a control unit, for example.The fan protection drops out and disconnects the motor from the mains.The motor protection is intrinsically safe.7.2.2 Connecting electric motorsIn order for the unit to operate properly it is important to connect it with a righthandrotating field.• Check the rotating field if necessary with a rotating field meter.DAMAGE TO THE UNIT!Correct assignment of the phase sequence to the specified rotational directionmust be checked before the motor is connected. If the wrong connection ismade the motor/fan may be damaged.PR-2009-0096-GB • Subject to modifications • Status 07/2010 45
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GEA CAIRplus - CS Klimateknik

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