Mitsubishi Electric FR-A820-00046 Instruction Manual page 876

(N) Operation via communication and its settings
Frequency command with sign (Pr. 541)
● By frequency command with sign, start command (forward rotation/reverse rotation) can be
inversed to operate.
● The Pr. 541 "Frequency command sign selection" setting is applied to the frequency command
from RWw0.
Speed setting using
Pr. 37 and Pr. 144
Not used
With
Tab. 5-307: Setting the sign with Pr. 541
● Relationship between the start command and sign (Pr. 541 = "1")
Start command
Forward rotation
Reverse rotation
Tab. 5-308: Influence of the sign on the rotation direction
NOTE When Pr. 541 = 1 (with sign):
● When EEPROM write is specified with the RY22, write mode error (error code H01) will occur.
● When both RY21 and RY22 are turned ON, RY21 has precedence.
● When power is turned ON (inverter reset), the initial setting status of the sign bit is "positive"
and the set frequency is "0 Hz". (The motor does not operate at the frequency set before turn-
ing OFF the power (inverter reset).)
● When set frequency is written with the instruction code of HED and HEE, the sign of the fre-
quency command is not changed.
Parameters referred to
Pr. 37
Pr. 144
Pr. 811
5 - 674
Pr. 541 Sign
0 Not used
1 With
0 Not used
1 With
Sign of the frequency command
+
–
+
–
Speed display
Speed setting switchover
Set resolution switchover
Setting range Actual frequency command
0 to 59000 0 to 590.00 Hz
-32768 to 32767
-327.68 to 327.67 Hz
(two's complement)
0 to 65535
It depends on Pr. 37, Pr. 144, Pr. 811.
-32768 to 32767
(in 1 or 0.1 increments)
(two's complement)
Actual run command
Forward rotation
Reverse rotation
Reverse rotation
Forward rotation
Parameters
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