Sturtevant Richmont Programmable Torque Verifier FM II, Руководство пользователя

Страница: 15 / 37

Page 13
The PTV-FM reduces the probability of missing a fastener in a multi-fastener assembly in two
ways:
1. Displaying the count of properly-torqued fasteners (or quantity remaining to be torqued) in the
batch at all times.
2. Sending a “Batch Accept” signal to the PLC and an audible signal to the operator when the
correct number of fasteners on the assembly has been properly tightened. The PTV auto-
matically resets to zero (or the number of fasteners to be tightened on the next assembly)
upon completion of the batch.
The operator is actually provided multiple signals at each step of the process, both for each indi-
vidual fastener and for the assembly batch.
Parameters
The definition of what is interpreted by the PTV-FM as a “proper” tightening is called a “parame-
ter”. Each parameter consists of a set of elements:
a minimum signal duration (TMIN),
a maximum signal duration (TMAX),
the FM channel the wrench will use (0-7),
which wrench will be used,
and the number of fasteners in the batch.
Time Between Clicks and Time Between Batches are additional optional elements.
The Generation II can store up to four parameters. At any given time, only one of the four may
be active. Switching among them may be performed manually via the Parameter Select Switch
on the left side of the unit, or be activated by a PLC command sent through the PLC Connector.
This provides the ability to tighten up to four different joints using only one Generation II PTV-
FM, a significant advance over the first generation. The four parameters can use from one to
four wrenches (for different torque levels or fastener sizes), or one to four different fastener
counts, or any combination that does not require more than four definitions of “proper” tightening
of the fasteners.
Two examples of how the Generation II works follow. The first example uses a Generation II
PTV-FM and a single FM Switch Wrench. This example assumes that the torque for all three
fasteners is the same. The second example uses six fasteners at two different torques to
demonstrate how the multiple parameter capability may be used.