Yaskawa Control Board Replacement Procedure User Manual

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

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

-ADV-

+U On Delay

-----------------------­n9-47 = 0.00μs

TM.G7.02 Page 1 of 5 Rev: 08-08, 08/22/2008

Control Board Replacement Procedure

for Large Capacity G7 Drives

Recommended Procedure for Replacing a Control Board in a CIMR-G7* 4055 to 4300
of Revision B or Later

Note: Follow all precautions in the drive’s technical manual, Document TM.G7.01, for safe wiring and operation of
the G7 Drive during auto-tuning.

Note: An appropriately sized motor with a FLA that closely matches the G7s rated output current needs to be
connected to the G7 while performing the Shipping Adjustment auto-tuning function. Tuning with a motor that is
considerably smaller than the G7 may adversely affect the perfo rmance of the G7.

Note: The motor will not rotate while performing Shipping Adjustment Auto-tuning. Therefore, the motor does not
need to be disconnected from the load. However, take appropriate precautions to secure the load and insulate the
motor terminals as voltage will be applied to the motor.

1. Before replacing the control board, use the COPY function of the digital operator to copy the G7 parameter
settings. When using the COPY function, first confirm the replacement control board software matches the
original control board software. The original control board software version can be viewed using the digital
operator by viewing monitor U1-14. Confirm the last 4 digits of the value monitored in U1-14 match the last 4
digits of the replacement control board part number (-SXXXX). The COPY function cannot be used if the
software version is different on the replacement control board. Manual parameter recording using the
Modified Constants Menu with the original control board will be necessary if the software versions do not
match. If in doubt, manually record the modified parameters as they appear in the original Control Board
Modified Constants Menu. In addition, record the setting of A1-02 (control method selection) for Step 4.

Item

Control Board Part Number ETCXXXXXX-SYYYY ETCXXXXXX-SYYYY

Software number (U1-14)

Inverter capacity (o2-04)

Control method (A1-02)

2. Replace the control board.

3. Change the kVA setting (o2-04) to match the G7s power section. See Figure 2.

Original Control Board

Value

(confirm same as original

Control PCB)

(set same as original Control

PCB to match the drive’s
power rating. Refer to Step 3
below)

(set same as original Control

PCB. Refer to Step 4 below)

Replacement

Control Board

Figure 2: Drive kVA Setting

TM.G7.02 Page 2 of 5 Rev: 08-08, 08/22/2008