Delta Electronics AC Motor Drive VFD-VE Series Especificaciones descargar pdf (Pagina 118)

Chapter 4 Parameters|

Revision August 2008, 2ELE, V1.02 4-75

+10V

PTC

VFD-EL

47k

resistor-divider

internal circuit

 Refer to following calculation for protection level and warning level.

1. Protection level

Pr.07.14= V

+10

* (R

PTC1

//47K) / [R1+( R

PTC1

//47K)]

2. Warning level

Pr.07.16= V

+10

* (R

PTC2

//47K) / [R1+( R

PTC2

//47K)]

3. Definition:

V+10: voltage between +10V-ACM, Range 10.4~11.2VDC

PTC1

: motor PTC overheat protection level. Corresponding voltage level set in Pr.07.14,

PTC2

: motor PTC overheat warning level. Corresponding voltage level set in Pr.07.15,

47kΩ: is AVI input impedance, R1: resistor-divider (recommended value: 1~20kΩ)

 Take the standard PTC thermistor as example: if protection level is 1330Ω, the voltage

between +10V-ACM is 10.5V and resistor-divider R1 is 4.4kΩ. Refer to following calculation

for Pr.07.14 setting.

1330//47000=(1330*47000)/(1330+47000)=1293.4

10.5*1293.4/(4400+1293.4)=2.38(V) ≒2.4(V)

Therefore, Pr.07.14 should be set to 2.4.

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Delta Electronics AC Motor Drive VFD-VE Series Especificaciones Pagina 118