Kriwan 22A445S80 INT69-2 Diagnose

Application

The motor protector 22A445S80 INT69-2 Diagnose is a further development of the reliable KRIWAN motor protectors. Its supplementary flexible-response protective functions help to improve the availability and extend the service life of a refrigeration system.

The 22A445S80 INT69-2 Diagnose automatically saves operational and error data in a non-volatile memory. This data can be retrieved on a PC and analyzed for diagnosis. The full scope of the diagnosis is achieved by using a KRIWAN-specific AMS sensor.

This motor protector is mainly employed on compressors which are qualified acc. to IEC/EN 60335.

Functional Description

The temperature monitoring of the motor winding is done with two evaluation processes:

1) Static: Switch-off is immediate if the nominal response temperature of the built-in AMS or PTC sensors is reached.

2) Dynamic: If the temperature increases unusually quickly, the motor is switched off immediately even if the temperature is still far below the nominal response temperature. This prevents excess temperatures from occurring.

A short circuit at an AMS or PTC input also leads to a switch-off.

After expiration of the reset delay and elimination of the error or cooldown, the compressor can be restarted.

For operation in the specified manner, the supply voltage has to be on permanently on the 22A445S80 INT69-2 Diagnose.
Temperature measuring circuits
- Type 1-2 AMS sensors in series alternative 1-9 PTC sensors acc. to DIN 44081, DIN 44082 in series  
- R25,total <1.8KΩ
- Rtrip, static 4.5KΩ ± 20%
- Rreset 2.75kΩ ±20%
- Max. length connection line 30m
Short circuit monitoring system PTC   Typically <30Ω  
Reset delay
 
- Motor temperature static - 5 min ± 1min
- Motor temperature dynamic - 5min  ± 1 min
Reset of reset delay   Main reset >5s only possible if there is no error current

 

Kriwan 22A445S80