GE Industrial Solutions DV-300 DC Quick Start - Manual (Page 19)

DV-300 Adjustable Speed Drives
—————— Quick Start up guide ——————
QS
19
7. CHECK MOTOR/ROLL
ROTATION, SPEED FEEDBACK
POLARITY, AND CALIBRATIONS
7a. Check motor/roll rotation
C
AUTION
:
Execution of this test will turn the motor shaft.
Use and take all safety precautions to protect
personnel from the hazards of rotating
equipment.
Any and all safeguards and interlocks should
be tested, and be operational before executing
this test.
A DC motor will rotate counterclockwise as viewed
from the commutator end, if the armature and field are
wired with the following polarity conventions:
These conventions should have been verified before
power up, and now is the time to verify rotation with the
mechanical load attached if possible.Make sure all safety
issues are resolved before running and rotating
equipment.
If the DV-300 is using a pot for speed reference into
analog input 1, turn the pot to about 10% of full speed.
If using the keypad for speed reference, go to
DRIVE STATUS
Ramp ref 1
INPUT VARIABLES, press ENT
Ramp Ref , press ENT
[Ramp ref 1], press ENT
Use the left and right arrow keys to select a digit of
the value, and use the + and - keys to change the
value.
Enter a rpm reference value approximately equal
to 10% of rated speed. press ENT.
Press CANC 3 times to get back to the main parameter
menus.
Scroll up using the up arrows until the START UP menu
screen is shown. press ENT.
Press the down arrow until the [Enable drive]
parameter is seen. press ENT.
Press the + key to set the enable, press ENT.
Press the green START key
While running the drive forward, verify the rotation of
the is forward, swapping the motor field leads if
incorrect (after stopping the drive, and removing power
).
At this time the speed regulation may not be smooth
and stable. This is OK. Stop and disable the drive.
7b. Calibrations
While running the drive at a low speed to check for
rotation direction:
- Verify the field current is at the desired setting, with
a clamp on DC ammeter, shunt , or series ammeter
(for example DVM, or Simpson style analog meter)
Check parameter STATUS \ field current amps for
agreement with the measured reading.
- Verify the armature voltage is approximately where
expected (for instance, if running at 10% speed,
check for 10% volts for a constant current field ).
Check parameter STATUS\ output volts for
agreement with the measured readings.
7c. Checking current regulator performance
using parameter Eint
While running the drive , monitor the parameter [Eint],
located under menu heading “Current Regulator”.
This measures an average internal current error.
Its value should be close to zero, but values dynamically
changing between -40 and 40 are acceptable.
The drive must have at least 30% load for this
reading to be considered as a valid performance
measurement.
If adjustments are needed, make small changes to the
parameter [Current Regulator \ Arm inductance] to fine
tune [Eint] to an acceptable value.
Refer to the DV-300 Instruction Book for detailed
information on fine tuning regulators.