98
Application Precautions
• Motor Switching Command and Motor Selection Monitor
When using the Motor Switching Command, be sure to switch the
motor when it is at a complete stop (i.e., while Inverter output is OFF
when the Run Command is OFF). Check the status of the Motor Selec-
tion Monitor and contactors M1 and M2 with an external sequence or
sequencer, and start Inverter operation only after confirming that the
motor has been switched. The motor switching process for the Inverter
takes 50 ms max.
If an attempt is made to switch the motor during operation or when the
motor is decelerating to a stop, the switching process will not be per-
formed, a SEr (sequence error) alarm will be displayed, a multi-function
output alarm will be output to the Digital Operator, and operation will
continue. No error will be output. When the motor comes to a complete
stop (i.e., when the Inverter output is OFF), the switching process will
be performed.
• Electronic Thermal Motor Protection (OL1)
Electronic thermal motor protection is performed based on n036 (Motor
Rated Current) when motor 1 is selected and based on n161 (Motor 2
Rated Current) when motor 2 is selected. When a Motor Switching
Command is allocated for a multi-function input terminal, OL1 calcula-
tions for motor 1 and motor 2 are always performed regardless of the
status of the Motor Switching Command input terminal.
Output current detection data for OL1 calculations is provided sepa-
rately for motor 1 and motor 2. (If motor 1 is selected, output current
detection data is calculated for motor 1 with the actual output current,
and output current detection data is calculated for motor 2 with an out-
put current of 0.0 A. If motor 2 is selected, output current detection data
will be calculated for motor 2 with the actual output current, and output
current detection data will be calculated for motor 1 with an output cur-
rent of 0.0 A. If motor 2 is selected, output current detection data will be
calculated for motor 2 with the actual output current, and output current
detection data will be calculated for motor 1 with an output current of
0.0 A.)
