2-48 Manual # 42-02-2223
Construction Mode
Verify Pattern Command and Drive Speed Feedback
1. Verify/set the following iView Drive parameters (Configure > Drive > General tab >
Speed Reference section):
• Reference type = Tachometer
• Scaling = 1.000
2. If you change any values, send them to the controller.
3. Display the Virtual Oscilloscope (View > Virtual Oscilloscope).
4. Set Test point 1 = Pattern (Command) and Test point 2 - Speed Feedback.
5. Run the car and verify the polarity (Test point 1 and 2 traces are both moving in the
same direction). If they not, change the Speed Reference Direction parameter (Forward
/ Reverse) on the Configuration > Drive > General tab.
6. Run the car and verify that the Pattern (Command) and
Speed Feedback (Test point 1 and 2 traces) are the same
amplitude. On the iView oscilloscope (or a DVM connected
between STP1 and STP2), compare the Pattern Command
and Speed Feedback readouts. They must match within
0.050 VDC while the car is running at steady state speed. If
not, adjust the TACH ADJ trimpot (upper right corner of
iBox). The iPower Box door can be opened slightly to
improve access to the TACH ADJ trimpot. Turn the pot
slowly. This is a 15 turn trimpot, but the adjustment from
maximum to minimum on the virtual oscilloscope is less
than 1/2 turn.
If the trimpot adjustment is insufficient, adjust the Scaling param-
eter (Configuration > Drive > General tab > Speed Reference sec-
tion) up or down in o.1 increments. Remember to Send the value to the controller, and then re-
adjust the trimpot.
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