Functional Description

• The INT69 E1 can monitor up to nine PTC thermistors even with differing rated shut-off temperatures. If one or more PTC thermistors become highly resistive, the motor protector switches off and locks.

• The monitoring of the phase sequence becomes active 1 second after the motor has started, for a time window of 5 seconds. In case of a wrong phase sequence the relay switches off and locks.

• The phase failure detection is active for about 1 second after the motor starts until the motor stops. In case of a detected phase failure, the motor is shut-off and a restart commences after about 10 seconds.
After the third shut-off, caused by a phase failure, within 12 minutes or at the 10th shut-off within 24 hours, there is a locked shut-off.

• After the motor is shut off, the phase monitoring is inactive for 10 seconds to avoid an unintended shut off by a motor that possibly may be rotating in reverse.

• The lock-out can be removed by a mains reset (>5s).

• The sensor and supply circuits are galvanically isolated from each other.

• The relay output is designed as a potential-free change-over contact in closed-circuit principle.

• The INT69 E1 is not suitable for use with frequency converters.

Functional Description

The temperature monitoring in the motor winding is done according to the static evaluation process; the motor is switched off immediately if the nominal response temperature of the built-in AMS or PTC sensors is reached.

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.