Fuji Electric Frenic lift, Reference Manual

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Motor Speed
(mm/s)
0
L117
RBRK
BRKS
ON
ON
ON
ON ON
L118 L118
L118
RUN command
(FWD or REV)
EN1&EN2
L108
Figure 2. Timing diagram when L117 speed level is reached.
Figure 3 shows a case where inverter is locked by
rbA alarm. As soon as rescue operation by brake
control starts, because speed doesn’t reach level set on parameter L108 and time set on L119 elapses,
inverter trips rbA alarm. When inverter trips an alarm, BRKS output function goes to OFF
immediately.
Motor Speed
(mm/s)
0
L117
RBrk
BRKS
ON
ON
L119
RUN command
(FWD or REV)
Alarm
ON
EN1&EN2
L108
Figure 3. Inverter locked by
rbA
(case 1).
Figure 4 shows a second case where inverter is locked by rbA alarm. As soon as rescue operation by
brake control starts, motor speed increases because lift car moves by gravity. Therefore speed
reaches a value over L108 speed level. Suddenly motor speed decreases to 0.00 mm/s, for example
because lift car is locked for any mechanical reason. At this point, because speed is below level set
on function code L108, L119 timer starts to count. When L119 time elapses inverter trips rbA alarm.
When inverter trips an alarm, BRKS output function goes to OFF immediately.
Even RUN command or
EN1 & EN2 are activated during alarm state, as it is happening with standard
operation, BRKS output function will not be activated.
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