5-75
Timing Scheme
Switching from inverter operation to commercial-power operation
ISW50/ISW60: ON → OFF
(1) The inverter output is shut OFF immediately (Power gate IGBT OFF)
(2) The inverter primary circuit
SW52-1 and the inverter secondary side SW52-2 are turned OFF immediately.
(3) If a run command is present after an elapse of t1 (0.2 sec + time specified by H13), the commercial power circuit
SW88 is turned ON.
Switching from commercial-power operation to inverter operation
ISW50/ISW60: OFF → ON
(1) The inverter primary circuit
SW52-1 is turned ON immediately.
(2) The commercial power circuit
SW88 is turned OFF immediately.
(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,
the inverter secondary circuit
SW52-2 is turned ON.
(4) After an elapse of t3 (0.2 sec + time specified by H13) from when
SW52-2 is turned ON, the inverter harmonizes
once the motor that has been freed from the commercial power to the commercial power frequency. Then the motor
returns to the operation driven by the inverter.
t1: 0.2 sec + Time specified by H13 (Restart mode after momentary power failure)
t2: 0.2 sec + Time required for the main circuit to get ready
t3: 0.2 sec + Time specified by H13 (Restart mode after momentary power failure)
Selection of Commercial Power Switching Sequence
J22 specifies whether or not to automatically switch to commercial-power operation when an inverter alarm occurs.
Data for J22 Sequence (upon occurrence of an alarm)
0 Keep inverter-operation (Stop due to alarm.)
1 Automatically switch to commercial-power operation
• The sequence operates normally also even when SW52-1 is not used and the main power of the inverter is
supplied at all times.
• Using
SW52-1 requires connecting the input terminals [R0] and [T0] for an auxiliary control power. Without
the connection, turning
SW52-1 OFF loses also the control power.
• The sequence operates normally even if an alarm occurs in the inverter except when the inverter itself is
broken. Therefore, for a critical facility, be sure to install an emergency switching circuit outside the
inverter.
• Turning ON both the magnetic contactor MC (88) at the commercial-power side and the MC (52-2) at the
inverter output side at the same time supplies main power mistakenly from the output (secondary) side o
To Next Page
Loading...
