Fuji Electric FRENIC-MEGA, Instruction Manual

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H18 Torque Control (Mode selection)
d32, d33 (Torque Control, Speed limits 1 and 2)
When vector control with/without speed sensor is selected, the inverter can control the motor-generating torque according to
a torque command sent from external sources.
„
Torque Control (Mode selection) (H18)
H18 specifies whether to enable or disable the torque control. Enabling the torque control offers two choices: with torque
current command and with torque command.
Data for H18 Available control
0
Disable (Speed control)
2 Enable (Torque control with torque current command)
3 Enable (Torque control with torque command)
„
Torque Commands
Torque commands can be given as analog voltage input (via terminals [12] and [V2]) or analog current input (via terminal
[C1]), or via the communications link (communication dedicated function codes S02 and S03). To use analog
voltage/current inputs, it is necessary to set E61 (for terminal [12]), E62 (for terminal [C1]), or E63 (for terminal [V2]) data
to "10" or "11."
Input Command form Function code setting Specifications
Terminal [12]
(-10 V to 10 V)
Torque command E61 = 10 Motor rated torque
±
200% /
±
10 V
Torque current command E61 = 11 Motor rated torque current
±
200% /
±
10V
Terminal [V2]
(-10 V to 10 V)
Torque command E63 = 10 Motor rated torque
±
200% /
±
10V
Torque current command E63 = 11 Motor rated torque current
±
200% /
±
10V
Terminal [C1]
(4 to 20 mA)
Torque command E62 = 10 Motor rated torque 200% / 20 mA
Torque current command E62 = 11 Motor rated torque current 200% / 20 mA
S02
(-327.68 to 327.67%)
Torque command
⎯
Motor rated torque /
±
100.00%
S03
(-327.68 to 327.67%)
Torque current command
⎯
Motor rated torque current /
±
100.00%
„
Polarity of Torque Commands
The polarity of a torque command switches according to the combination of the polarity of an external torque command and
a run command on terminal [FWD] or [REV], as listed below.
Polarity of torque command Run command (ON) Torque polarity
Positive
FWD
Positive torque (Forward driving/Reverse braking)
REV
Negative torque (Forward braking/Reverse driving)
Negative
FWD
Negative torque (Forward braking/Reverse driving)
REV
Positive torque(Forward driving/Reverse braking)
„ Cancel torque control --
Hz/TRQ
(E01 to E07, data = 23)
When torque control is enabled (H18 = 2 or 3), assigning the terminal command
Hz/TRQ
("Cancel torque control") to any of
the general-purpose digital input terminals (data = 23) enables switching between speed control and torque control.
Cancel torque control signal
Hz/TRQ
Operation
ON Cancel torque control (Enable speed control)
OFF Enable torque control
„ Torque Control (Speed limits 1 and 2) (d32, d33)
Torque control controls the motor-generating torque, not the speed. The speed is determined secondarily by torque of the
load, inertia of the machinery, and other factors. To prevent a dangerous situation, therefore, the speed limit functions (d32
and d33) are provided inside the inverter.
If a regenerative load (which is not generated usually) is generated under droop control or function codes are
incorrectly configured, then the motor may rotate at an unintended high speed. To protect the machinery, it is
possible to specify the overspeed level with d32 and d33 as follows.
• Forward overspeed level = Maximum frequency 1 (F03) x Speed limit 1 (d32) x 120 (%)
• Reverse overspeed level = Maximum frequency 1 (F03) x Speed limit 2 (d33) x 120 (%)