3-18
Displaying running status
To display the running status in hexadecimal format, each state has been assigned to bits 0 to 15 as
listed in Table 3.13. Table 3.14 shows the relationship between each of the status assignments and
the LED monitor display. Table 3.15 gives the conversion table from 4-bit binary to hexadecimal.
Table 3.13 Running Status Bit Assignment
Bit Notation Content Bit Notation Content
15 BUSY
"1" when function code data is
being written.
7 VL "1" under voltage limiting control.
14 Always "0." 6 TL "1" under torque limiting control.
13
WR
Always "0." 5 NUV
"1" when the DC link bus voltage is
higher than the undervoltage
level.
12 RL
"1" when communication is
enabled (when ready for run and
frequency commands via
communications link).
4 BRK "1" during braking.
11 ALM "1" when an alarm has occurred. 3 INT
"1" when the inverter output is
shut down.
10 DEC "1" during deceleration. 2 EXT "1" during DC braking.
9 ACC "1" during acceleration. 1 REV
"1" during running in the reverse
direction.
8 IL "1" under current limiting control. 0 FWD
"1" during running in the forward
direction.
Table 3.14 Running Status Display
LED No. LED4 LED3 LED2 LED1
Bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Notation BUSY WR RL ALM DEC ACC IL VL TL NUV BRK INT EXT REV FWD
Binary 1 0 0 0 0 0 1 1 0 0 1 0 0 0 0 1
Example
Hexa-
decimal
on the
LED
monitor
Hexadecimal expression
A 4-bit binary number can be expressed in hexadecimal format (1 hexadecimal digit). Table 3.15
shows the correspondence between the two notations. The hexadecimals are shown as they appear
on the LED monitor.
Table 3.15 Binary and Hexadecimal Conversion
Binary Hexadecimal Binary Hexadecimal
0 0 0 0
1 0 0 0
0 0 0 1
1 0 0 1
0 0 1 0
1 0 1 0
C
0 0 1 1
1 0 1 1
D
0 1 0 0
1 1 0 0
E
0 1 0 1
1 1 0 1
F
0 1 1 0
1 1 1 0
G
0 1 1 1
1 1 1 1
H
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