Adjusting Leveling and Final Stop
4-35
4
iControl DC
Ride Quality (System 12 SCR Drive)
If you are experiencing a ride sensation that is not exactly oscillation, but might be described as
a rough texture, it might be due to:
• The encoder, attached to the motor shaft, may not be mounted securely, which may cause
bouncing or a slight variation in the speed feedback signal once every revolution. On a
geared machine, the coupling used between the tach or encoder and the motor can also be
a source of vibration. In both cases, the problem is observed by looking at the AC-coupled
encoder speed signal on iBox test point STP2 (with the Virtual Oscilloscope Test point 2
set to Speed Feedback). You may see the vibration frequency increase and decrease with
car speed. This is absolute proof of a mechanical problem with the speed transducer. Elec-
trically induced oscillations will be characterized by a frequency of oscillation that is con-
stant (does not change significantly with speed).
• If the above steps do not resolve the vibration, the motor may not have been trimmed to
the machine properly. Use a dial indicator to check alignment of motor and machine.
Ride Quality (Quattro DC Drive)
If you are experiencing a ride sensation that is not exactly oscillation, but might be described as
a rough texture, it might be due to:
• The speed control loop gains may not be adjusted properly. Please refer to the Magnetek
Quattro DC Drive Technical Manual for adjustment procedures.
• The encoder, attached to the motor shaft, may not be mounted securely, which may cause
bouncing or a slight variation in the speed feedback signal once every revolution. On a
geared machine, the coupling used between the tach or encoder and the motor can also be
a source of vibration. In both cases, the problem is observed by looking at the AC-coupled
encoder speed signal on iBox test point STP2 (with the Virtual Oscilloscope Test point 2
set to Speed Feedback). You may see the vibration frequency increase and decrease with
car speed. This is absolute proof of a mechanical problem with the speed transducer. Elec-
trically induced oscillations will be characterized by a frequency of oscillation that is con-
stant (does not change significantly with speed).
• If the above steps do not resolve the vibration, the motor may not have been trimmed to
the machine properly. Use a dial indicator to check alignment of motor and machine.
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