Does ARD motor protector standard configue with current transformer?

Standard configued with CT,1A/5A specification, no primary transformer.

Can ARD motor protector be used for single-phase motor protection?

Yes,the motor type can be set as single-phase motors in the menu.

Can ARD motor protector be connected to AC 660V/1140V system?

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.

Why motor protector report phase failure during the motor startup?

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.

Motor Protection Relays, Smart Motor Control, Motor Current/Control Protection



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.

Products

ARD Series Smart Motor Protector For Sale

With a variety of protection functions, remote automatic control, on-site direct control, panel indication, signal alarm, field bus communication.

ARD Series Smart Motor Protector Data Sheet

Protect selection
Type		ALP300	ARD2/2L	ARD2F	ARM2M	ARM3M	ARD3T
Functional position		Protection+Networking		Protection+Control+Networking
Application cabinet		Automatic control ccabinet,control box	Chest of drawers,vertical cabinets
Protective function	Current protection	√	√	√	√	√	√
	Voltage protection	×	×	√	√	√	√
	Temperature protection	×	×	√	√	√	√(max3)
	Operation and maintenance protection	×	×	×	√	√	×
	Current Anti-shake	×	×	√	√	√	√
	Current Leakage	√	√	√	√	√	√
Communiation function	Modbus-RTU	√	√	√	√	√(max2)	√(max2)
	Profibus-DP	×	×	√	√	√(max2)	√
	Profinet	×	×	×	×	√	×
	Modbus-TCP	×	×	×	×	√	×
	WIFI	×	×	×	×	√	×
Switch input(optional)		2	2	9	8	10(standard)	8
Switch output(optional channels after '+')		2+2	2+2	2+3	5	6(standard)	4+3
Start Control		×	×	√	√	√	√
4-20mA output		√	√	√	√	√(max2)	√(max2)
Event Record	Disturbance recorder	√	√	√	√	√	√
	Operation and maintenance	×	×	×	×	√	×
	Waveform record	×	×	×	×	√	×
Measurement function	Measure current	√	√	√	√	√	√
	Leakage current	×	×	√	√	√	√
	Measure voltage	×	×	√	√	√	√
	2-63rd harmonics	×	×	×	×	√	×
	PTC/NTC	×	×	√	√	√	√
Display Panel	Digital Tube	√	√	×	×	×	×
	Monochrome LCD	×	√	√	√	√	√
	Color LCD	×	×	×	×	√	×

How Does a Motor Protection Circuit Breaker Work?

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.

ARD Series Smart Motor Protector FAQs



Does ARD motor protector standard configue with current transformer?


Standard configued with CT,1A/5A specification, no primary transformer.


Can ARD motor protector be used for single-phase motor protection?


Yes,the motor type can be set as single-phase motors in the menu.


Can ARD motor protector be connected to AC 660V/1140V system?


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.


Why motor protector report phase failure during the motor startup?


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.