Acrel ARD Series Smart Motor Protector with overload, phase failure, unbalance, underload, grounding/leakage, locked rotor and other protection functions. It can form a motor control and protection unit with electrical components such as contactors and motor starters, and has functions such as remote automatic control, on-site direct control, panel indication, signal alarm, and field bus communication.
|Application cabinet||Automatic control ccabinet,control box||Chest of drawers,vertical cabinets|
|Protective function||Current protection||√||√||√||√||√||√|
|Operation and maintenance protection||×||×||×||√||√||×|
|Switch output(optional channels after '+')||2+2||2+2||2+3||5||6(standard)||4+3|
|Event Record||Disturbance recorder||√||√||√||√||√||√|
|Operation and maintenance||×||×||×||×||√||×|
|Measurement function||Measure current||√||√||√||√||√||√|
|Display Panel||Digital Tube||√||√||×||×||×||×|
Motor protector consists of current transformer, detection, amplification, delay, adjustment circuit and executive relay. When the detection circuit detects that the current induced by the current transformer is out of phase or larger than the set value, it is amplified by the amplifier to make the relay act. The relay contacts are connected in series in the power supply circuit of the contactor coil. After the relay operates, the contactor is powered off to protect the motor. The delay circuit is used to avoid the starting current of the motor, and its duration is adjustable. The adjustment circuit is used to accurately set the operating current according to the operating current of the protected motor.
Standard configued with CT,1A/5A specification, no primary transformer.
Yes,the motor type can be set as single-phase motors in the menu.
Yes, Auxiliary and control power supply need AC 220V,1140V or higher voltage class current transformers is converted into 1A or 5A signal to be connected to portector through PT.
Phase failure means that the current of a certain phase is lower than 5% of the rated current. It is necessary to confirm whether the actual current is lower than 5%, and confirm whether the current specaification of the protector matches the motor.