Data Sheet for Product

Submittal Sheet SED2 NEMA 12 Variable Frequency Drives with Bypass Options
Document No. 154-066
February 11, 2008
Page 6 of 8 http://www.sbt.siemens.com/hvp/drives Siemens Industry, Inc.
Wiring Diagrams, continued
NOTES:
1. Branch circuit protection to be provided by installer, per UL508A, if not provided with drive.
2. For bypass operation, modify these drive parameters: P0704[0] and P0704[1] = 3.
3. Control and communication wiring should be 300V UL minimum.
4. Communication wiring should be run with maximum separation possible from all other wiring.
5. Essential service mode operates the motor full speed (bypass) with no protection for the motor or system.
6. Ensure that automatic bypass will not damage the system before activating.
7. See Publication No. 125-3215 SED2 Conventional Bypass Options Operating Instructions, for proper fuse and wire sizes.
8. See Publication No. 125-3201 SED2 Variable Frequency Drives Start-Up, Operation and Maintence Manual, for SED2
VFD input/output control signal wiring details.
Figure 3. NEMA 12 Bypass Power Circuit.