January 2011 8 of 9 Impulse•G+/VG+ Series 3
Safe-Off 8001.x
PN: 140-10305
Safe-Off terminals
Safe-Off is configured at the factory prior to shipment. There are no parameters to set and it
cannot be turned off in software. Safe-Off involves two digital inputs, BB and BB1, as well as the
common on terminal SN. Breaking the connection between SN and either BB or BB1 will
immediately disable the drive motor output. The terminals are physically wired to the drive’s
output devices (IGBTs). A run command from the drive software cannot star the motor, no
matter how the drive is configured or commanded.
Termin
al
Signal Name Signal Level Suggested Wire
Size (AWG)
Possible Wire
Sizes (AWG)
BB Hardware
Baseblock
24VDC, 8mA
photocoupler
18
Stranded wire:
26 to 14
BB1 Hardware
Baseblock 1
SN Sequence input
neutral
SC Sequence input
common
Figure 4: Safe-Off terminals (BB, BB1,
SN)
Safe-Off Control Interface Board
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