Naoki, Vicky, Camilla

After the vent, we can reach NLN, but we have locklosses from PI24 at 10.431 kHz. The SUS_PI guardian tries to damp, but it does not help. Vicky checked that the frequency of this PI is 10431.03 Hz as shown in the attachment. This is within the input bandpass filter (428.5-433.5 Hz after downconversion by 10kHz). 

We tried to excite the PI24 with ETMY. We used awggui and sent a sine wave at 431 Hz to H1:SUS-PI_PROC_COMPUTE_MODE24_BP_EXC. We could excite/damp the PI24 RMSMON by changing the damping phase so PI damping should work. We increased the damping gain for PI24 from 1000 to 10000, which is set by SUS_PI guardian.