Yaskawa GPD 506/P5 Section One - Manual (Page 36)

PP.P5G5.01.Troubleshoot
Page 36
Rev. 06/11/2003
Parallel Transistors
Some inverter models have more than one transistor module per positive and
negative phase. The transistor modules in each pair on the output phase must
have the same gain code. The gain code signifies the characteristics of the
device when it is tested by the manufacturer. The indication (2P) in the
specifications column found in the parts list indicates that these transistors must
be replaced in pairs. If one transistor module in a portion of the output phase is
shorted, the other must also be replaced. All (4) of the transistors in a single
phase do not have to have the same gain codes, only the transistors in parallel
within that phase.
G
Transistor module with gain code Schematic of parallel transistors
Code G Code G
Code B Code B