Creative Conners Stagehand Mini2, Руководство пользователя

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Stagehand Mini 2 Manual
Page 14
All limit switch signals require Normally Closed (N.C.) switches. The Stagehand sources 12vdc on a pin of the
each limit circuit and expects to see that 12vdc signal returned on the other pin when the limit is not activated.
If the limit is either activated or disconnected or a wiring fault occurs, the 12vdc return signal is lifted and the
Stagehand will enter a limit fault condition and disallow motion.
The limit switch inputs are used to protect against the motor traveling too far in a direction and causing damage
or injury. When running in a cue, this is one of the safety features that guards against encoder failure. When
jogging manually, this keeps you from accidentally traveling too far.
All encoder signals use differential line receivers which use a balanced signal transmitted over twisted‐pair wires
to drastically reduce electrical interference and thus reduce the opportunity for inaccurate encoder data.
Encoders connected to the Stagehand must be equipped with differential line drivers to be compatible.
Encoders are powered at 5vdc for broadest compatibility.
Figure 11
Let’s start with the limit signals:

Ultimate Limit – a pair of Normally Closed (N.C.) switches can be wired in series to this pair of terminals
to provide protection against Forward and Reverse Limit switch failures. Typically, an Ultimate Limit
switch is positioned just beyond both the Forward and Reverse Limit switch. If an Ultimate Limit is
activated, the Stagehand will disallow any further movement until the limit is physically cleared. In
normal operation, there is never a reason to strike an Ultimate Limit. An Ultimate Limit signal indicates
an equipment problem with at least one of the primary limit switches. The faulty equipment must be
repaired and the Ultimate Limit must be mechanically reset before the Stagehand will allow motion.