228 Rockwell Automation Publication 2094-UM001J-EN-P - March 2017
Appendix C DC Common Bus Applications
Calculate Total Bus
Capacitance
Total bus capacitance is the sum of all capacitance values for your Bulletin 2094
common-bus modules. Specifically, this includes the capacitance values for
each of these modules:
• Leader IAM (converter and inverter) module
• Each AM and shunt module (if present) on the leader IAM power rail
• Each IPIM module (if present) on the leader IAM power rail
• Each follower IAM (converter and inverter) module
• Each AM module on the follower IAM power rail
• Each IPIM module (if present) on the follower IAM power rail
Refer to Bulletin 2094 Drive Capacitance Values on page 229
for IAM, AM,
IPIM, and shunt module capacitance values.
Table 119 - Maximum IAM Module Bus Capacitance
IMPORTANT If total bus capacitance of your system exceeds the leader IAM module
precharge rating and input power is applied, the IAM module seven-
segment status indicator displays error code E90 (precharge timeout fault).
To correct this condition, you must replace the leader IAM module with a
larger module or decrease the total bus capacitance by removing AM
modules or IPIM modules.
Leader IAM (200V-class)
Module
Bus Capacitance,
max
μF
Leader IAM (400V-class)
Modules
Bus Capacitance,
max
μF
2094-AC05-MP5-x
7145
2094-BC01-MP5-x
4585
2094-AC05-M01-x 2094-BC01-M01-x
2094-AC09-M02-x 15,295 2094-BC02-M02-x 8955
2094-AC16-M03-x 34,400 2094-BC04-M03-x 8955
2094-AC32-M05-x 62,825 2094-BC07-M05-x 17,915
IMPORTANT If your total bus capacitance value exceeds the value in the table above, you
must increase the size of the leader IAM module or decrease the total bus
capacitance by removing other modules on the power rail.
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