Delta Electronics VFD-E manual Resistor-divider

		Chapter 4 Parameters
Settings	0.1~10.0V	Factory Setting: 2.4

When the motor is running at low frequency for a long time, the cooling function of the motor fan will be lower. To prevent overheating, it needs to have a Positive Temperature Coefficient thermoistor on the motor and connect its output signal to the drive’s corresponding control terminals.

When the source of first/second frequency command is set to AVI (02.00=1/02.09=1), it will disable the function of motor PTC overheat protection (i.e. Pr.07.12 cannot be set to 1).

If temperature exceeds the setting level, motor will be coast to stop and is

displayed. When the temperature decreases below the level of (Pr.07.15-Pr.07.16) and

stops blinking, you can press RESET key to clear the fault.

Pr.07.14 (overheat protection level) must exceed Pr.07.15 (overheat warning level). The PTC uses the AVI-input and is connected via resistor-divider as shown below.

1.The voltage between +10V to ACM: lies within 10.4V~11.2V.

2.The impedance for AVI is around 47kΩ.

3.Recommended value for resistor-divider R1 is 1~20kΩ.

4.Please contact your motor dealer for the curve of temperature and resistance value for PTC.

	VFD-E
	+10V
resistor-divider
R1	AVI
	47kΩ
PTC
	ACM
	internal circuit

Revision June 2008, 04EE, SW--PW V1.11/CTL V2.11 4-99