User Guide

6
Choosing the Mode
Your Variable Speed Zebra operates in 4
different modes: Voltage Check - Observe -
Control - and Winding Test.
•
Voltage Check- Always use this mode first
to rule out low voltage as a problem. The AC
voltage is shown on the display when this
switch is pressed. Additionally, the red LOW
VOLTS LED will flash if it is below 20 VAC.
• Observe Mode- is just that: you are observ-
ing the signals that the equipment is sending
to the motor’s electronics. Use this mode to
see if the furnace or air handler is sending the
proper signals to the motor.
• Control Mode- This mode allows you to
generate any command that the equipment
would send to the motor, observing the result-
ing RPM and CFM to see (a) if the motor op-
erates correctly when that setting is used, and
(b) if a tap setting change is desirable to
change system performance characteristics.
• Winding Test- If you have concluded motor
failure, this mode determines which section
of the motor is not working properly.