A 178 alarm is most likely a parameter issue. Have you restarted the machine? Call your local HFO and have them do a parameter check if you cannot get the issued resolved.
A G187 is not necessary to activate HSM. HSM is active whenever the parameter for it is set to on.
You can calculate BPS by using the formula found here:
CNC - Haas Automation, Inc. - Solutions-Applications 3D