Rockwell Automation DC3E Non-Regenerative DC Drive User Guide 1/4 - 2 HP, 115/230 VAC - Manual (Page 30)

22 Installation
Using tachometer feedback improves speed regulation from
approximately 1% of motor base speed to approximately
0.1% of motor base speed. Use tachometers rated from 7
VDC per 1000 RPM to 50 VDC per 1000 RPM. Connect
the tachometer to terminals T1 and T2 of terminal block
502 (TB502). Place switch SW505 in the TACH position.
See Figure 6 for tachometer connections.
IMPORTANT: The TACH trimpot must be adjusted prior
to operating with tachometer feedback. Refer to the
Calibration section (pg 48) for instructions on calibrating
the TACH trimpot.
ATTENTION: Applying the incorrect polarity to the
tachometer can cause an overspeed condition. Make
sure the positive (+) wire is connected to terminal T1
and the negative (-) wire is connect to terminal T2 when
the motor is running in the forward direction. Failure to
observe this precaution could result in bodily injury.
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Tachometer feedback
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