Electronics AC-24 - Manual (Page 7)

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E. Use the Display Range Fine button (2-29) for slower adjustment speed.
8. MOTOR AMPS CALIBRATION
A. The factory calibration of input span should not need any adjustment. Verify that the wire
size is adequate in the 5-amp loop of the current transformer secondary. It should be a
minimum of 16 AWG for short runs of 5 feet or less. Longer runs should use 14 AWG or
12 AWG wire size. If the digital amps display is compared to a clamp-on type ammeter
and is accurate at the low amps but not at higher operating amps, then the 5-amp loop
wire is too small. Either use a larger gage wire or re-locate the current shunt from the rear
terminal strip of the AC controller to be closer to the current transformer and then connect
the shunt to the AC controller using 18AWG or larger shield cable.
B. Turn on the motor and note the amperage reading. If it does not agree with the reading
from a portable clamp-on ammeter then adjust the Calib Span (2-25) ▼ or ▲.
C. Transmit an Enable signal (or use the Mode switch (2-22) and operate the motor using a
typical amperage setting and note the Control Display reading (1-3). If the reading does
not agree with the clamp-on ammeter then adjust the Calib Span (2-25) ▼ or ▲ again.
D. Turn off the enable signal and re-verify the no-load display. If there is a significant differ-
ence then there is a problem with the size of the current transformer secondary wires and
they must be increased in size.
9. WARRANTY
A. Electronics Incorporated warrants this product to be free from defect in material and work-
manship for a period of two years from date of original shipment from Electronics Incorpo-
rated.
B. Defective units must be returned to Electronics Incorporated with shipping costs prepaid.
Electronics Incorporated will repair or replace defective unit at its option. No consequential
liability is assumed.
C. No other warranty, including merchantability or fitness for purpose, applies or is expressed
or implied.
D. Warranty work is only available at the factory. On-site service or start-up assistance is
available at extra cost to customer.
10. UPGRADES — REVISIONS
Design improvements are constantly being made to our products. Please contact Electronics
Incorporated for details. When ordering spare units, please refer to model number and revi-
sion level or modification identification (if any) as well as the serial number of each unit.
11. TROUBLESHOOTING GUIDE
A. Unstable operation
1. Several conditions can affect motor amps stability. It is important to determine if the
problem is caused by the machine or by the MagnaValve.
2. Place the servo (2-20) to off.
3. Turn the machine on and apply the Enable signal or place mode to “on”.
4. Slowly increase the setpoint to increase the motor amps until the motor amps display is
at the desired value. The motor amps feedback signal does not affect the controller
stability in this mode (servo off). Therefore, the wheel is the only cause for instability.
5. To demonstrate this further, another test can be performed.
6. Close the slide gate above the MagnaValve.
7. Start the wheel and apply the Enable signal.