Fuji Electric Frenic lift, Reference Manual

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2.3 Overview of Function Code
C
hap.
2
FUN
CT
IO
N
C
O
D
E
S
Speed
0
High speed
Run command
(FWD, REV)
ON
SCC
Short-circuit contact
Open
SCCF
L120
IGBT’s gate
Active
ON
EN1&EN2
ON
ON
BRKS
ON
L82
Inverter trips any
alarm .
Alarm
ON
L86
Figure 6. Inverter in alarm (
ALM
output function ON)
Case 2:
RBRK input function is ON
Figure 7 shows the case of rescue operation by brake control. In this case, motor phases short circuit
is performed in order to avoid that motor accelerates too fast.
As it can be observed, as soon as rescue operation by brake control starts (
RBRK is ON) function
SCC turns to OFF (short circuit is applied). Contacts feedback is received after the mechanical delay
of the power relay (or mini contactor). Brake will not be opened before timer L82 has elapsed. This
is in order to avoid that motor brake opens when short circuit is not done, in other words, it avoids
that contacts closed while motor is already generating energy. For a similar reason, when rescue
operation by brake control finishes ( RBRK is OFF) SCC will not be turned ON until timer L86 is
elapsed. By means of this short circuit will be open when motors brake is already applied (motor is
not generating anymore).
Run command
(FWD, REV)
SCCF
RBrk
BRKS
Short-circuit contact
IGBT’s gate
SCC
ALM
ON
ON
OFF
ON
OPEN CLOSED
OFF
BRKE
0
Speed
ON ON
ON ON
ON
OPEN
ON
ON
ON
OFF
L82 L86
Figure 7. Rescue operation by brake control
Case 3:
BRKE
,
BRKE1
or
BRKE2
input functions are ON and
BRKS
output function is OFF
Figure 8 shows the case when brake is controlled by external means. This is detected because
BRKS
signal is not ON but
BRKE
feedback signal is received. This basically means that somebody opened
the brake by external means. In this case, short circuit will be applied as well in order to avoid that
motor accelerates fast as brake will be opened.
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