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App-2
PA 7300
APPENDIX
b. Energy-Savings operation procedures
(1) Enter the Energy-savings mode by setting the third digit of the operation mode selection
5 (Sn-09) to 1. (The Energy-savings mode is already set prior to shipping.)
(2) Set Cn-60 to the motor code (refer to page App-1) which is determined by the
motor capacity and voltage.
(3) Set operation frequency.
(4) Input the run command. The motor accelerates up to the set frequency (bn-01). When
it reaches the set value, the Energy-savings mode is enabled and operations perform at
voltages according to the load.
c. Verification of Energy-savings Power
Energy-savings power can vary by comparing power in the V/f control mode operation
(Sn-09 third digit to 0) with power in the Energy-savings mode operation (Sn-08 third digit to 1).
Power can be monitored by Un-06.
Energy savings values vary according to the load ratio. Little energy-savings effect is realized
with load ratios exceeding 70%. As the load becomes lighter, the effect becomes greater.
d. Adjustment
Since the constants used in the Energy-savings mode are already set initially to the optimum
values, adjustments are not normally needed. However, when the motor characteristics are much
different from those of the TECO standard motors, or if a fault occurs because of improper constant
setting, then perform the following adjustment.
Adjustment at fault Occurrence
FAULT
CORRECTIVE ACTION
Power does not change in the Energy-savings mode.
Does setting frequency exceed 100Hz? If it does,
the Energy-savings mode is released.
Power variation is very small in the Energy-savings mode.
Is the load ratio excessively large? When the load ratio is
excessively large, energy saved value becomes larger as the
load becomes lighter.
Hunting at a light load
Increase the time constant (On-16) of power detecting filter
Current increases to cause OL1 or OL2 although within
Decrease the value (Cn-46) of Energy-savings voltage upper
rated load torque (Especially at low frequency)
limit at 6Hz. Or decrease the energysaving coefficient
reduction ratio (Cn-59)
When the Energy-savings mode is entered after completion
Increase the lower (Cn-47 or Cn-48)
of acceleration, the motor stalls to a stop (especially
at a light load).
Revolutions change periodically and its cycle is almost
Decrease search operation voltage stop (Cn-51 or Cn-52)
equal to Cn-50 set value.
Содержание PA7300 Series
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Страница 154: ...5100 N IH 35 Round Rock Texas 78681 USA 1 800 279 4007 www tecowestinghouse com ...