Yaskawa Control Board Replacement Procedure for Large Capacity G7 Drives User Manual
Yaskawa Equipment
TM.G7.02
Page 1 of 5
Rev: 08-08, 08/22/2008
Control Board Replacement Procedure
for Large Capacity G7 Drives
Introduction
For large capacity, G7 480V drives, “On-Delay Compensation” parameter values set the degree of bias for the
IGBT on the positive and negative side of each voltage phase. Each G7 contains a unique set of values for these
six parameters (n9-47 thru n9-52) as IGBT voltage drop among the series/parallel IGBT configuration may vary
slightly. When replacing a control board in a large horsepower G7 (see below), the On-Delay Compensation
values must be set using Shipping Adjustment Auto-tuning function. This is because the replacement control
board will have null values for all six parameters (0.00μs).
Failure to follow this procedure will not result in immediate G7 failure, but it may adversely affect G7 performance.
Figure 1: Example of Null Parameter Value
-ADV-
+U On Delay
------------------------
n9-47 = 0.00
μs
Affected Part/Model Numbers
CIMR-G7*40550B CIMR-G7*40550C
CIMR-G7*40750B CIMR-G7*40750C
CIMR-G7*40900B CIMR-G7*40900C
CIMR-G7*41100B CIMR-G7*41100C
CIMR-G7*41320B CIMR-G7*41320C
CIMR-G7*41850B CIMR-G7*41850C
CIMR-G7*42200B CIMR-G7*42200C
CIMR-G7*43000B CIMR-G7*43000C
*denotes spec. A, C, U, P, or S