Rockwell Automation 1397 DC Drive Firmware 2.xx - Manual (Page 102)

4–30 Start–Up and Adjustment
Publication 1397-5.0 — June, 2001
!
ATTENTION: If encoder/tachometer wiring is
incorrect, sudden and rapid acceleration may result,
which can cause overspeed of the motor. Run tach &
encoder checks as detailed on pages 4-33 & 4-34.
Failure to observe this precaution could result in
personal injury and/or damage to equipment.
The following parameters MUST be TEMPORARILY
lowered to 25% nominal to help guard against motor or
equipment damage when running the following motor
polarity checks:
Parameter Recommended Start–Up Value Group
Max Process Speed (P. 042)
Positive Current Limit (P. 067)
Positive Current Limit Source (P. 069)
Negative Current Limit (P. 068)
Negative Current Limit Source (P.070) 25% of Max Motor Speed
25%
Register
25%
Register Setup
Adv Setup
Adv Setup
Adv Setup
Adv Setup
1. Turn off and lock out all power to the Drive.
2. When checking motor polarity, the Drive will have power applied
and the motor will rotate. The motor should be temporarily
uncoupled from the load.
3. If the motor cannot be uncoupled from the load, the following
motor checks are recommended:
a) All electrical connections are tight.
b) The brushes are properly seated.
c) The motor shaft is free to rotate.
4. Connect a DC Voltmeter to Terminal A1 (+) and 45 (–) at the
output of the Drive.
5. Apply power to the Drive.
6. Rotate the motor in the direction required by the driven
equipment using an externally applied mechanical force.
7. Measure the voltage present between terminals A1 (+) and 45 (–).
Set the meter to the 500 VDC range to start, and then work down
until a measurement can be obtained. The voltage at A1 should
be positive with respect to terminal 45 (voltage magnitude is
unimportant).
8. If the voltage polarity is incorrect, remove power from the Drive
and refer to the motor connection diagrams in Figures 4.13 &
4.14.