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(25) Speed search detection level (Cn-38)
• Upon power recovery, when the AC drive output current is larger than the set value of Cn-38,
speed search operation is started. When the AC drive’s output current is smaller than the set value
of Cn-38, the frequency is interpreted as a speed synchronization point, and acceleration or
deceleration is resumed up to a specified frequency.
(26) Speed search time (Cn-39)
• Set deceleration time during speed search in units of 0.1 second. Setting of 0.0 second
causes no speed search.
(27) Minimum baseblock time (Cn-40)
• On detecting momentary power loss, the AC drive shuts off output and maintains the
baseblock state for a given time. Set time in Cn-40 when residual voltage is expected
to be negligible
• When the momentary power loss time is longer than the minimum baseblock time, speed search
operation is started immediately after power recovery.
(28) V/f speed search (Cn-41)
•
To ensure that a fault such as OC does not occur during a speed search operation, V/f
must be reduced during speed search operation, as compared with that during normal
operation. Set V/f during speed search as follows by the set value of Cn-41: V/f during
speed search = V/f at normal operation × Cn-41
(29) Voltage recovery time (Cn-42)
• Set in Cn-42 the time between completion of speed search operation and return to V/f
at normal operation. The set of voltage recovery time is set as follows:
230V Class:
Time required to raise voltage from 0 to 230V
460V Class:
Time required to raise voltage from 0 to 460V
600V Class:
Time required to raise voltage from 0 to 600V
2-20
PA 7300
PART II: OPERATION MANUAL
MOMETARY
POWER
LOSS TIME
MIN.
BASEBLOCK
TIME
INVERTER
BASEBLOCK
TIME
WHEN MIN. BASEBLOCK
TIME IS LONGER THAN
MOMENTARY POWER
LOSS TIME.
WHEN MIN. BASEBLOCK
TIME IS SHORTER THAN
MOMENTARY POWER
LOSS TIME.
MOMETARY
POWER
LOSS TIME
MIN.
BASEBLOCK
TIME
INVERTER
BASEBLOCK
TIME
Содержание PA7300 Series
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Страница 10: ...PART I INSTALLATION MANUAL ...
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Страница 154: ...5100 N IH 35 Round Rock Texas 78681 USA 1 800 279 4007 www tecowestinghouse com ...