EQ7 Series Instruction Manual - TECO-Westinghouse Motor Company
EQ7 Series Instruction Manual - TECO-Westinghouse Motor Company
EQ7 Series Instruction Manual - TECO-Westinghouse Motor Company
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F14<br />
Restart Mode after Momentary Power Failure (Mode selection)<br />
H13 (Restart Mode after Momentary Power Failure (Restart time))<br />
H14 (Restart Mode after Momentary Power Failure (Frequency fall rate))<br />
H15 (Restart Mode after Momentary Power Failure (Continuous running level))<br />
H16 (Restart Mode after Momentary Power Failure (Allowable momentary power failure time))<br />
H92 (Continuity of running (P))<br />
H93 (Continuity of running (I))<br />
F14 specifies the action to be taken by the inverter (trip and restart) in the event of a momentary power failure.<br />
• Restart mode after momentary power failure (Mode selection) (F14)<br />
• Under V/f control (F42 = 0 or 2)<br />
Data for F14<br />
Auto search disabled<br />
Description<br />
Auto search enabled<br />
0: Trip immediately As soon as the DC link bus voltage drops below the undervoltage detection level due to a<br />
momentary power failure, the inverter issues undervoltage alarm lu and shuts down its output so<br />
that the motor enters a coast-to-stop state.<br />
1: Trip after recovery<br />
from power failure<br />
2: Trip after<br />
decelerate-to-stop<br />
3: Continue to run<br />
(for heavy inertia or<br />
general loads)<br />
4: Restart at the<br />
frequency at which<br />
the power failure<br />
occurred<br />
(for general loads)<br />
5: Restart at the<br />
starting frequency<br />
As soon as the DC link bus voltage drops below the undervoltage detection level due to a<br />
momentary power failure, the inverter shuts down its output so that the motor enters a coast-to-stop<br />
state, but it does not enter the undervoltage state or issue undervoltage alarm lu .<br />
The moment the power is restored, an undervoltage alarm lu is issued, while the motor remains in a<br />
coast-to-stop state.<br />
As soon as the DC link bus voltage drops below the continuous running level due to a momentary<br />
power failure, decelerate-to-shop control is invoked. Decelerate-to-stop control regenerates kinetic<br />
energy from the load's moment of inertia, slowing down the motor and continuing the deceleration<br />
operation. After decelerate-to-stop operation, an undervoltage alarm lu is issued.<br />
As soon as the DC link bus voltage drops below the continuous running level due to a momentary<br />
power failure, continuous running control is invoked. Continuous running control regenerates kinetic<br />
energy from the load’s moment of inertia, continues running, and waits the recovery of power. When<br />
an undervoltage condition is detected due to a lack of energy to be regenerated, the output<br />
frequency at that time is saved, the output of the inverter is shut down, and the motor enters a<br />
coast-to-stop state.<br />
If a run command has been input,<br />
restoring power restarts the inverter at the<br />
output frequency saved when<br />
undervoltage was detected.<br />
This setting is ideal for fan applications with a large moment of inertia.<br />
If a run command has been input, restoring power<br />
performs auto search for idling motor speed and<br />
restarts running the motor at the frequency calculated<br />
based on the searched speed.<br />
As soon as the DC link bus voltage drops below the undervoltage detection level due to a<br />
momentary power failure, the inverter shuts down the output so that the motor enters a<br />
coast-to-stop state.<br />
If a run command has been input,<br />
restoring power restarts the inverter at the<br />
output frequency saved when<br />
undervoltage was detected.<br />
If a run command has been input, restoring power<br />
performs auto search for idling motor speed and restarts<br />
running the motor at the frequency calculated based on<br />
the searched speed.<br />
This setting is ideal for applications with a moment of inertia large enough not to slow down the<br />
motor quickly, such as fans, even after the motor enters a coast-to-stop state upon occurrence of a<br />
momentary power failure.<br />
As soon as the DC link bus voltage drops below the undervoltage detection level due to a<br />
momentary power failure, the inverter shuts down the output so that the motor enters a<br />
coast-to-stop state.<br />
If a run command has been input,<br />
restoring power restarts the inverter at the<br />
starting frequency specified by function<br />
code F23.<br />
If a run command has been input, restoring power<br />
performs auto search for idling motor speed and restarts<br />
running the motor at the frequency calculated based on<br />
the searched speed.<br />
This setting is ideal for heavy load applications such as pumps, having a small moment of inertia, in<br />
which the motor speed quickly goes down to zero as soon as it enters a coast-to-stop state upon<br />
occurrence of a momentary power failure.<br />
Auto search is enabled by turning ON the digital terminal command STM ("Enable auto search for idling motor speed at<br />
starting") or setting the H09 data to "1" or "2."<br />
For details about the digital terminal command STM and auto search, refer to the description of H09 (Starting Mode, Auto<br />
search).<br />
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