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EQ7 Series Instruction Manual - TECO-Westinghouse Motor Company

EQ7 Series Instruction Manual - TECO-Westinghouse Motor Company

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Switching from commercial-power operation to inverter operation ISW50/ISW60: OFF ON<br />

(1) The inverter primary circuit SW52-1 is turned ON immediately.<br />

(2) The commercial power circuit SW88 is turned OFF immediately.<br />

(3) After an elapse of t2 (0.2 sec + time required for the main circuit to get ready) from when SW52-1 is turned ON,<br />

the inverter secondary circuit SW52-2 is turned ON.<br />

(4) After an elapse of t3 (0.2 sec + time specified by H13) from when SW52-2 is turned ON, the inverter<br />

synchronizes once the motor that has been freed from the commercial power to the commercial power<br />

frequency. Then the motor returns to the operation driven by the inverter.<br />

t1: 0.2 sec + Time specified by H13 (Restart mode after momentary power failure)<br />

t2: 0.2 sec + Time required for the main circuit to get ready<br />

t3: 0.2 sec + Time specified by H13 (Restart mode after momentary power failure)<br />

Selection of Commercial Power Switching Sequence<br />

J22 specifies whether or not to automatically switch to commercial-power operation when an inverter alarm<br />

occurs.<br />

Data for J22<br />

Sequence (upon occurrence of an alarm)<br />

0 Keep inverter-operation (Stop due to alarm.)<br />

1 Automatically switch to commercial-power operation<br />

• The sequence operates normally also even when SW52-1 is not used and the main power of the<br />

inverter is supplied at all times.<br />

• Using SW52-1 requires connecting the input terminals [R0] and [T0] for an auxiliary control power.<br />

Without the connection, turning SW52-1 OFF loses also the control power.<br />

• The sequence operates normally even if an alarm occurs in the inverter except when the inverter itself<br />

is broken. Therefore, for a critical facility, be sure to install an emergency switching circuit outside the<br />

inverter.<br />

• Turning ON both the magnetic contactor MC (88) at the commercial-power side and the MC (52-2) at<br />

the inverter output side at the same time supplies main power mistakenly from the output (secondary)<br />

side of the inverter, which may damage the inverter. To prevent it, be sure to set up an interlocking logic<br />

outside the inverter.<br />

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