Frequency Command With Sign (Pr.541) - Mitsubishi Electric 800 Series Instruction Manual

7.8.2

Frequency command with sign (Pr.541)

By adding a sign to the frequency command value or the speed limit value, the start command (forward/reverse rotation) can
be inverted to start operation.
Select whether or not to use a sign for the frequency command value / speed limit value.
Pr. Name
Frequency command sign
541
selection
Rotations per minute
(mechanical speed) setting
using Pr.37 and Pr.53
Not used
Used
• Relationship between the start command and sign (Pr.541 = "1")
Start command Sign of the frequency command
+
Forward rotation
-
+
Reverse rotation
-
NOTE
• When Pr.541 = "1" (with sign)
The set frequency cannot be written in EEPROM.
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 turning OFF the power (inverter reset).)
62
PPO TYPE SUPPORT SPECIFICATION
Initial value
0 0, 1
Pr.541
setting Sign
value
Not
0 0 to 59000
used
1 Used -32768 to 32767 (complement of 2)
Not
0 0 to 65535
used
1 Used -32768 to 32767 (complement of 2)
Forward rotation
Reverse rotation
Reverse rotation
Forward rotation
Setting range
Setting range
0 to 590.00 Hz
-327.68 to 327.67 Hz
Differs according to the Pr.37, Pr.53 settings.
(1 increments)
Actual operation command
Actual frequency command