Tiếng Việt   English

FAQs

Here are some FAQs and answers. If you still have any other questions related to our services, please send your questions to the mailbox info@etecvn.com and remember clearly the question title and content to get answers quickly.
write_faqs

icon Reply:

For general applications, the constant torque can’t be used for the frequency above 60Hz. Because the voltage and power are usually constant when the frequency is above 60Hz. When you need to have constant torque in high speed, please pay attention for choosing motors and drives.

icon Reply:

The motor speed can be adjusted by the following ways: 
1. Variable resistor on the keypad 
2. External analog voltage/current signal 
3. Multi-function input terminals to control multi-speed control 
4. Communication method by using the host controller

icon Reply:

When the AC motor drive is controlled by the open loop, the motor speed will be varied within ±5% X rated slip. You can use the AC motor drive with the PG feedback function when the accurate speed is required.
What is SCADA?  - | 03/12/2012

icon Reply:


What is HVAC system?  - | 03/12/2012

icon Reply:


icon Reply:

When selecting ON-OFF control method, the output control is executed by ON/OFF or full output. The output control is OFF when the process value reaches the set value, and the output control is ON when the process value is lower than the set value. This method will fluctuate temperature unstably. Contrasting to ON-FF method, the PID control is to control the output by continuously proportional calculation to compensate for the change in the system. When the process value is close to the set value, PID control will adjust the output by percentage to reach a stable temperature situation.

icon Reply:

Every device has to be set the same protocol and each has to has its own station address then indicate the Modbus address of the devices which want to transfer data to.

icon Reply:

The acceleration time is to determine the time required for AC motor drive ramp from 0.0Hz to its maximum output frequency. The deceleration time is to determine the time required for AC motor drive to decelerate from its maximum output frequency to 0.0Hz. 

When an AC motor drive operates in a full load condition, large load inertia is likely to occur and cause motor continues to ramp when the output is stopped. Delta’s AC motor drive offers "optimize acceleration and deceleration function” that regulate the accelerating and decelerating speed. It moderates the vibration when activating and stopping the loading. As the motor detects a minimum level of torque, it will accelerate to the setting level of frequency in the shortest period of time with a smooth start-up current. For deceleration, Delta’s AC motor drive will estimate the amount of regenerative energy that will be produced and smoothly stop the motor in the meanwhile.

icon Reply:

The greatest difference among Delta single-phase and three-phase AC motor drive is the power capacity. Single-phase model is designed for greater power capacity. If a three-phase model is connected to a single-phase power, it may not provide enough output current and may cause a phase loss problem. To ensure a normal system operation, please connect three-phase AC motor drive to the accurate power source.

icon Reply:

When the accel./decel. time is too short and the change of output frequency is faster than the motor speed, the AC motor drive will stop due to over-current. This situation is called stall. To have normal motor operation, it needs to control frequency by the output current. Therefore, the accel. rate should be decreased when the output current is too large. That is stall prevention

Supports

yahoo     skype
 
Sales team: 0913 949 582
Technical team: 0913 949 582
Customer care center: 0913 949 582
Hotline: 0903 949 582