Motor protection INT 69 SE-B1/B2 SE-E1

Motor protection Kriwan INT 69, SE-B1, SE-B2, SE-E1, Frascold compressors, Copeland, Bitzer Maneurop, Danfoss Performer

E the protection system used in the spiral refrigeration compressors the electric motors from 7.5 to 15.0 HP is marked with the letter 'W', standing in second place in the designation code of the motor. In this the system uses the dependence of the resistance of the thermistors from temperature (PTC-resistor), which allows to determine the actual winding temperature. A chain of four thermistors, United consistently placed in the motor winding so that the temperature of the thermistors corresponded to the winding temperature.
E module thermal protection INT 69 SCY company Kriwan you want to control resistance and off control of the relay depending on the resistance of the thermistor chain. Three thermistor (one in each the winding - these compressors are always 3-phase) installed in the upper part of the stator near the suction nozzle, have the setting to limits temperature +140°C. the Fourth thermistor is placed on the stator in the lower part immersed in oil, and has a protective setting to +80°C. the Fifth thermistor, placed directly in the discharge window fixed spiral and which discharge thermostat, configured to shut off the compressor at temperatures above +140°C. All protective thermistors are connected in series and connected to the control the electronic circuit module INT 69 SCY (American models compressors can be seen as protective modules of other companies, in fact performs the same function).

When the total resistance of the thermistor chain reaches disabling (at +80°C for one at +140°C for the other), the module opens the control circuit and disables the compressor. After a chain of thermistors is pretty cool, the total the resistance drops to values re-enable, but the module itself allow the compressor to start no earlier than 30 minutes

Module INT 69 SCY also includes the correct sequence phases L1, L2, L3 supply voltage. Three-phase power supply shall to be connected in the correct phase sequence, to ensure correct start-up and operations of the compressor. With the loss of one of phase module INT 69 SCY shuts down the compressor activating the delay time (5 min). If normal power is restored, it continues to work if there is no phase, the module continues to block repeated actuation of the compressor. After 10 attempts to start the compressor, module blocks its inclusion, and re-run it can only when restoring supply normal power supply. Marking you can easily determine what type of protection is used in this specific compressor.

Reciprocating compressors:
Instead electronic protective devices INT69VS/INT69UL that before was equipped with compressors from 4Z-8.2 to 6F-50.2, tandem-compressors from 44J-26.2 to 66F-100.2, and instead of devices INT69V/7-II, which previously equipped with compressors from 2KC-05.2 up to 4CC-9.2 and 8GC-50.2 to 8FC-70.2, tandem-compressors from 22EC-4.2 to 44CC-18.2 currently are electronic protective device SE-1 and SE-B2. Device SE-B1 equipped with compressors from 2KC-05.2 to 4NC-20.2. Unit SE-B2 equipped with compressors from 4J-13.2 to 8FC-70.2. New and old protective the devices are fully interchangeable.

Screw compressors:
Semi-hermetic screw compressors HS/OS53, HS64, HS/OS74 and HS/OS85 equipped new protective devices SE-E1. All compact screw compressors series CSH and CSW is also equipped with a protective device (SE-E1.
For control oil circulation units with semi-hermetic and open screw compressors are supposed to use a new protective unit SE-B2 instead of the previously used devices INT69VS.
Hermetic screw compressors VSK series, as before, are equipped with protective devices INT69VSY-II to special notice.