Fuji Electric Frenic lift, Справочное руководство

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2.3 Overview of Function Code
C
hap.
2
FUN
CT
IO
N
C
O
D
E
S
As it can be observed, as soon as RUN command is ON ( FWD or REV ) and EN terminals are active,
As it can be observed, as soon as RUN command is ON ( FWD or REV ) and EN terminals are active,
SCC signal is ON. Therefore from this moment short circuit contact is opened. On the other hand,
IGBT’s drivers cannot be ON until inverter doesn’t receive short circuit contacts feedback ( SCCF ).
By means of this, inverter damage can be avoided. As soon as SCCF signal is received (contact
feedback) and timer L121 is elapsed, inverter can aply voltage at the output as no short circuit is
present.
At stopping,
SCC
is not OFF until IGBT’s drivers are OFF and time L86 has elapsed. By means of
this, inverter ensures that when short circuit is applied, IGBT’s drivers are OFF, and brake is closed.
brake is closed, no regenerated energy can flow from the motor.
In figure 2, an emergency stop timing sequence is shown.
Speed
0
High speed
Run command
(FWD, REV)
ON
SCC
Short-circuit contact
Open
SCCF
L120 L86
IGBT’s gate
Active
ON
EN1&EN2
ON
ON
L120
BRKS
ON
L82
Safety chain is opened.
Figure 2. Emergency stop timing sequence.
In figure 3, a starting sequence with feedback contacts timing problem is shown.
Inverter trips SCA .
Speed
0
Run command
(FWD, REV)
ON
SCC
Short-circuit contact
SCCF
L120
IGBT’s gate
ON
EN1&EN2
ON
ON
BRKS
Alarm
ON
Figure 3. Starting sequence with feedback contacts timing problem ( SCA alarm).
As it can be observed, inverter waits L121 time in order to receive SCCF signal (contact feedback).
When L121 time finished, no feedback is received from shor circuit contacts, therefore inverter trips
SCA alarm. At same time, because constant feedback is not received, IGBT’s drivers are not
activated and SCC output signal goes to OFF state.
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