Answer / siva kumar

UPS is a uninterrupted power supply, where as VFD is a variable frequency drive. VFD is used for controlling speed of the motors according to the below mentioned formula

speed(N)= 120f/p

f= frequency, p= no.of poles

poles are fixed at the design stage of the machine later we can't be modified so speed control is possible only controlling the frequency of the machine.

Answer / houssem

UPS converting incoming AC to DC through a rectifier and converts it back with an inverter with the same frequency

VFD converting incoming AC to DC through a rectifier and converts it back with an inverter with variable frequency according to operating point (Tm= V/F) of a motor

What are Rectifiers and what is the use of it?

25 Answers  

---

Why the single phase A.C motor taking more current than 3 phase A.C motor?

0 Answers   HCC,

---

differnce between ups and inverters. Series and parallel batteries connections of ups.

0 Answers  

---

What are the advantages of current commutated chopper?

0 Answers  

---

What is meant by negative converter group in a cyclo-converter?

0 Answers  

---

Can any body tell me the procegure about how to use Super Position Theorem to solve any electronics circuit.Please tell me all the steps which used in Super Position Theorem.Thanks

3 Answers  

---

newspaper is reusable one or not? renewable one means what is the reason?

1 Answers   Honeywell,

---

why -48v is used for BTS in telecom?

0 Answers  

---

in optical fiber cabels, which type of losses can be occured, and how the signal-loss happens?

2 Answers  

---

what is the use of -3 db frequency?& why does it exist in filters?

1 Answers  

---

IAM COLOR BLIND WHAT IS ELEGIBILITY FOR JUNIOR EXECUTIVE (ELECTRONICS)MEDICAL

0 Answers  

---

3 flipflops are connected so that after 0 to 5 count occured next number is zero. So what is the counter?

0 Answers  

---