Yaskawa V7 Enhanced PID - Manual (Page 2)

Date: 07/01/04, Rev: 04-07 Page 2 of 2 TM.V7SW.037
Overview:
This software adds a DC Injection command as a multi-function input selection. The DC Injection
command causes DC current to flow in the motor windings, which aligns the motor poles and provides
holding torque.
Additional Multi-function Input Setting:
Setting Description
28 DC Injection Command
When n050 ~ n056 = 28, the corresponding input terminal (S1 ~ S7) is used for commanding DC
Injection.
Description of Functionality:
• The DC Injection command will be active under the following conditions: the inverter is ready (i.e. not
in program mode or in a fault state), no run command is present, and the output frequency is less
than the Minimum Frequency (n016).
• The DC Injection Current Level is set by the standard parameter n089 (as a percentage of inverter
rated current).
• The DC Injection at Start and DC Injection at Stop parameters n090 and n091 have priority over the
external DC Injection command.
• The External Baseblock command has priority over the external DC Injection command.
Timing Chart:
Run
Command
DC Injection
Command
Output
Frequency
DC Injection DC Injection
10ms
Baseblock *
* To prevent the 10ms Baseblock at the end of deceleration, set DC Injection Time at Stop n090 = 0.1
sec.