Delta Electronics VFD-M Reserved, Pr.155, Pr.156, Pr.157 Communication Mode Selection, Modbus

Chapter 4 Parameters
Pr. 152	Skip Frequency Width
	Settings	0.00 to 400.00Hz
Pr. 153	Bias Frequency Width
	Settings	0.00 to 400.00Hz

Factory Setting: 0.00

Factory Setting: 0.00

Frequency of Δ top point Fup= master frequency F + Pr.152 + Pr.153. Frequency of Δ down point Fdown= master frequency F – Pr.152 – Pr.153.

Pr.152

Master Pr.10, 12 Frequency

(F)

Pr.11, 13

Fup

Double Pr. 153

Fdown

Pr. 154	Reserved
Pr.155	Compensation Coefficient for Motor Instability

Factory Setting: 0.0

Settings 0.1 to 5.0 (recommended setting 2.0) 0.0 Disable

This parameter is used to improve a condition of unstable current in any specific area. For higher frequencies, you can adjust this parameter to 0.0, and increase the setting value in Pr.155 for 30HP and above (a setting of 2.0 is recommended).

Pr.156	Communication Response Delay Time
	Settings 0 to 200 (x500µs)	Factory Setting: 0

This parameter is used to set communication response delay time. If you set Pr. 156 to 1 the communication response delay time will be 1 X 500µs=500µs, set Pr. 156 to 2 the communication response delay time will be 2 X 500µs=1000µs.

Pr.157 Communication Mode Selection

Factory Setting: 1

Settings 0	Delta ASCII
1	MODBUS

4-84 Revision May 2008, ME14, SW V3.04