Delta Electronics VFD-E manual 07.15, 07.16

Chapter 4 Parameters

Refer to following calculation for protection level and warning level.

1.Protection level

Pr.07.14= V+10 * (RPTC1//47K) / [R1+( RPTC1//47K)]

2.Warning level

Pr.07.16= V+10 * (RPTC2//47K) / [R1+( RPTC2//47K)]

3.Definition:

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

RPTC1: motor PTC overheat protection level. Corresponding voltage level set in

Pr.07.14, RPTC2: 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.

		resistor value (Ω)
		1330
		550
			Tr	temperature (℃)
			Tr-5℃Tr+5℃
07.15	Motor PTC Overheat Warning Level				Unit: 0.1
	Settings	0.1~10.0V			Factory Setting: 1.2
07.16	Motor PTC Overheat Reset Delta Level				Unit: 0.1
	Settings	0.1~5.0V			Factory Setting: 0.6

07.17Treatment of the motor PTC Overheat

Factory Setting: 0

Settings	0	Warn and RAMP to stop
	1	Warn and COAST to stop
	2	Warn and keep running

4-100 Revision June 2008, 04EE, SW--PW V1.11/CTL V2.11