ABB FSO-21 - Page 183

Safety functions 183
Step Description
1 The SSM1 request is received (for example, from the I/O) and the FSO starts the
SSM1 monitoring. The motor speed is between the SSM1 limit positive (A) and SSM1
limit positive (B). The SSM1 indication goes on.
2 The motor speed goes above the SSM1 limit positive (A), the SSM1 indication goes off.
3 The motor speed goes below the SSM1 limit positive (A), the SSM1 indication goes on.
4 The motor speed goes below the SSM1 limit negative (B), the SSM1 indication goes
off.
5 The motor speed goes above the SSM1 limit negative (B), the SSM1 indication goes
on.
6 The SSM1 request is removed and the FSO stops the SSM1 monitoring. The SSM1
indication goes off.