Hitachi PN-150BE Manual page 25

PN-150BE Biased High Efficiency Vital Relay
Contact surfaces should not be disturbed unless there is evidence of severe pitting from
excessive loading or an accidental short through the contacts. In case contacts must be
dressed, nothing coarser than a #6 pillar file should be used and this should be followed
by the use of Metallographic paper to remove file marks.
After the contacts are filed and/or after adjustments have been made to meet calibration
requirements, clean the contacts in accordance with the instructions in Section 4.2.2.2
of this manual.
Copyright 2019 SM 4551L, Rev. 0 1, March 2019 4-9