Product details

• ABB Type Designation:
• DSAI 155A
  
• Catalog Description:
• StepUp of DSAI 155 to DSAI 155A
• Country of Origin:
• Sweden (SE)
• Gross Weight:
• 0.35 kg
  
• Invoice Description:
• StepUp of DSAI 155 to DSAI 155A
  
• Made To Order:
• No
  
• Medium Description:
• StepUp of DSAI155 to DSAI 155A
  
• Minimum Order Quantity:
• 1 piece
  
• Order Multiple:
• 1 piece
  
• Package Level 1 Gross Weight:
• 0.35 kg
  
• Package Level 1 Units:
• 1 piece
  
• Part Type:
• Exchange
  
• Product Name:
• I-O Module
  
• Product Net Weight:
• 0.35 kg

The input and output module is used to connect the passive devices such as smoke exhaust valve, air supply valve and fire valve to the control bus. There is a pair of normally open and normally closed contacts in the input and output module. The module has a DC 24V voltage output, which is used to connect with the relay contacts into an active output to meet the different needs of the field. In addition, the module is also provided with a switching signal input terminal, which is used to connect with the switching contact of the field equipment in order to confirm whether the field equipment is operating. It should be noted that the module contacts should not be directly connected to the AC control loop to prevent strong AC interference signals from damaging the module or control equipment.

Voltage forming circuit action:(1) Starting power change(2) The secondary circuit of TA and TV of the primary equipment is completely isolated from the microcomputer A/D conversion system to improve anti-interference ability.What is the role of voltage regulator V1 and V2 in the circuit?The voltage regulator V1 and V2 constitute bidirectional limiting, so that the input voltage of the sample holder and A/D conversion chip in the following link is limited to within a peak-to-peak ±10V (or 5V).

1. Low-pass filteringDuring the transient state of the failure of the power system, the voltage and current contain high frequencies, so the highest frequency component should be limited to a certain frequency band before the use to reduce the sampling frequency fs, which on the one hand reduces the speed requirements of the hardware, on the other hand, the sampling of the required highest frequency signal will not be distorted.Analog low-pass filters can be made active or passive, the most commonly used is the RC low-pass filter, the order depends on the specific situation.

2. Sampling and sampling theoremAnalog sampling can be divided into two types: DC sampling and AC sampling.(1) DC samplingDc sampling refers to converting the continuously changing analog in the field into DC voltage signal, and then sending it to A/D converter for conversion. That is, the analog quantity sampled by the A/D converter is the DC signal.(2) AC samplingWhen AC current and AC voltage are collected, the input to the A/D converter is the AC voltage signal proportional to the frequency of the primary current and primary voltage of the power system. As shown on the following page.

 ABB series of products