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CT4 control for three-phase Varispeed motors

CT4 control for three-phase Varispeed motors



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CT4 is a tachometric voltage regulator which operates according to the principle of phase partialisation. The voltage generated by silicon-controlled diodes (SCR) is the result of an analogue process which maintains constant motor revolutions by means of differential control  between the actual speed i.e. the tachogenerator voltage signal and the speed set on the potentiometer or by the external analogue signal (+10 V).

CT4 operates on one quadrant and therefore is capable of generating only drive torque, with considerably high starting torque. All controls feature galvanic isolation from the mains. The combination with a FAE VARISPEED asynchronous motor makes for an inexpensive, silent running, simple and reliable variable speed drive. The control  of deceleration  ramp produces its effects only in case of braking loads or irreversible systems. To control inertial loads in deceleration use device IST2.

CT4 applications as radio frequency filter, built-in or external versions (request filter or specifications when ordering) comply with general product standards regarding conducted emission and conducted susceptibility. As regards susceptibility on control cables, twice the minimum required protection degree is guaranteed for heavy industry; refer to recommendations for power and control cables in the event of problems caused by electromagnetic interference.

DRIVE MODEL

V421

230/400V

V422

230/400V

V423

230/400V

V424

230V

POWER MAX

 

kW 1,5/2,5

 

kW 2,5/3,6

 

kW 3,6/5,2*

 

kW 5,2*

 

POWER SUPPLY           

standard 220/380 V 3-phase with jumpers for voltage changeover; other power supplies available on request

                                                        * = Version with centrifugal fan

 

 

SPEED AND ROTATION

 

 

 

DIRECTION ADJUSTMENT

 

Speed and direction adjustment by means of potentiometer or by means of analogue signal 0 / + 10 V

Internal trimmers for min. and max. speed adjustment within potentiometer operation range

Internal trimmers for 2 pre-set speeds in addition to potentiometer speed settings

For the reversing it is necessary to invert two supply  phase

ACCELERATION RAMP

 

DECELERATION RAMP

Internal trimmer for adjustment of acceleration ramp adjustable from 0 to 5 sec.; other times available on request

Internal trimmer for adjustment of deceleration ramp adjustable from 0 to 5 sec.; other times available on request

TORQUE LIMIT

Maximum torque settings by means of internal trimmer and torque adjustment by means of potentiometer or external analogue signal

INDICATOR INSTRUMENT OUTPUTS

0-5 V dc output for digital/analogue speed indicator

INDICATOR LEDS

Power on

Power supply phase failure

Motor tachogenerator signal failure

Control signal failure

Start/stop with inertia

Connections ± potentiometer failure

ELECTRONIC PROTECTION DEVICES

Galvanic isolation from mains power supply on all controls

Automatic motor shutdown in event of :

power failure , tachogenerator signal failure, connections ± potentiometer failure

 

DIMENSIONS (mm)

235Lx225hx122p

235Lx425hx

122p

WEIGHT (kG)

2,3

3,3

3,7

5

OPERATING TEMP.

-10°C / +45°C ambient temperature

HUMIDITY

95% maximum (non-condensing)

ALTITUDE

Up to 1000 m without derating

PROTECTION

Metal enclosure with high quality IP20 polycarbonate protection

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