Fuji Electric Frenic lift, Справочное руководство

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In speed control
Unbalanced load compensation requires keeping the reference speed (pre-ramp) at 0.00 r/min and
releasing the brake during the period from the start of running to the completion of calculation (that
is, during the activation timer setting specified by L66).
If the reference speed (pre-ramp) other than 0.00 r/min is entered before the time length specified by
L66 elapses, unbalanced load compensation immediately starts.
During the time length (L66) from the start of estimation of an unbalanced load, the inverter holds
zero speed with the zero speed control specified when unbalanced load compensation is enabled.
After the time length (L66), the current reference torque value inside the inverter will be taken as a
torque bias amount. After that, the inverter runs in speed control with the torque bias amount under
ASR.
Time
Speed
0
ON
FWD
ON
ON
Zero speed
command
High speed
command
Creep speed
command
Zero speed
command
Release Brake Charge
Torque bias
τ
4
Torque command
inside the inverter
L57
SS1
SS2
High speed
Creep speed
UNBL
ON
ON
SS4
L66
L55
τ
1
τ
3
τ
2
Details
(1) During the period from the entry of a run command to that of an UNBL command, the
inverterruns with "User controller's torque bias amount τ 2."
(2) During the time length (L66) for the estimation of an unbalanced load, the "Inverter internal
reference torque" is equal to "Reference torque at the zero speed hold period in inverter position
deviation zero control" plus "User controller's torque bias amount τ 2." Finally, the "Inverter
internal reference torque" becomes equal to "Load torque τ 1."
(3) When the time length (L66) elapses, adding the "Unbalanced load compensation amount τ 3" to
"User controller's torque bias amount τ 2" produces "Torque bias amount τ 4." At that point, τ 3 =
τ 1 - τ 2. After that, the inverter runs in speed control with the "Torque bias amount τ 4" and
under normal ASR operation.
(4) During the inverter shutdown sequence, the inverter decreases the reference torque value held
by itself to 0, taking time specified by L56, and then shuts itself down.
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