Add fast brake option for hwp.py #194
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BrianJKoopman
requested changes
Dec 20, 2024
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Thanks for the PR! I'll wait for simonsobs/socs#787 to be resolved and merged. In the meantime a couple of comments below.
| @@ -20,7 +20,7 @@ def set_freq(freq): | |||
| check_response(hwp, resp) | |||
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| def stop(active=True, brake_voltage=None): | |||
| def stop(active=True, brake_voltage=None, fast=False): | |||
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Please add the new fast argument to the docstring.
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You may have noticed the failing tests in the checks. Two tests in test_hwp.py are failing. These should be modified to handle cases for the new fast argument.
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The fast brake option in this PR is related to #179.
WG team is trying to measure the time constant by changing the hwp frequency rapidly e.g. +2Hz to -2Hz.
Current brake command is designed for gentle spindown and it takes >10 min to start inverse rotation.
New option of brake command is expected to take <2 min to spindown.
https://docs.google.com/presentation/d/1-kgAFn2sVR3R_Hp8_HcEYgZ8_SoNihm-UwsMn-Skxto/edit?usp=sharing
The modification in
hwp_supervisoris discussed in PR #787 in socs.This PR should be merged after the hwp_supervisor change is approved.