YASKAWA CIPR-GA50C series Technical Manual page 685

4 : Overexcitation/High Flux
Enables Overexcitation/High Flux and enables a shorter deceleration time than when L3-04 = 0.
Note:
• If the overexcitation time is long and you decelerate frequently, the drive can detect oL1 [Motor Overload] faults. If the drive detects
oL1, decrease the deceleration time or install a braking resistor to the drive.
• The deceleration time during Overexcitation Deceleration changes when the motor characteristics and machine inertia change. Adjust
the n3-13 [OverexcitationBraking (OEB) Gain] and n3-23 [Overexcitation Braking Operation] levels. Refer to "n3: HighSlip/
OverexciteBraking" for more information about the overexcitation function.
5 : Overexcitation/High Flux 2
Enables Overexcitation/High Flux 2. This function decreases the possible deceleration time more than
Overexcitation/High Flux.
The drive decreases motor speed and tries to keep the DC bus voltage at the L3-17 level.
If the drive detects oL1, decrease the values set in n3-13 and n3-21. If the drive detects ov, increase the values set
in C1-02, C1-04, C1-06, and C1-08 [Deceleration Times].
Note:
• During Overexcitation/High Flux 2, the drive disables Hunting Prevention in V/f Control and also disables Speed Control that uses
torque limit in OLV Control.
• Refer to "n3: HighSlip/OverexciteBraking" for more information about the overexcitation function.
7 : Overexcitation/High Flux 3
If you set L3-04 = 7 [Overexcitation Braking 3], the overexcitation increases compared with 4 [Overexcitation/
High Flux]. This can decrease the deceleration time.
Note:
When L3-04 = 7, the overexcitation current increases as compared with 4. Motor load becomes larger, and it can cause oL1 [Motor
Overload]. When you can use L3-04 = 4 to operate the drive, set L3-04 = 4.
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L3-05: Stall Prevention during RUN
No.
Name
(Hex.)
L3-05 Stall Prevention during
RUN
(0493)
Stall Prevention function during run prevents the motor from stalling by automatically reducing the speed when
an oL1 [Motor Overload] occurs while the motor is running at constant speed.
Note:
• An output frequency less than 6 Hz disables Stall Prevention during Run. The setting values of L3-05 and L3-06 [Stall Prevent Level
during Run] do not have an effect.
• The setting range changes when the A1-02 [Control Method Selection] value changes:
–A1-02 = 0, 5 [V/f, OLV/PM] : 0 to 2
–A1-02 =8 [EZOLV] : 0, 3
0 : No
The drive runs at the set frequency reference. A heavy load can cause the motor to stall and trip the drive with oC
[Overcurrent] or oL1.
1 : Deceleration Time 1 (C1-02)
The drive will decelerate for the time set in C1-02 [Deceleration Time 1] when the current is more than the Stall
Prevention level set in L3-06. When the current level is less than the "L3-06 setting value - 2%" for 100 ms, the
drive accelerates again for the acceleration time applicable at that time until it is at the set frequency.
2 : Deceleration Time 2 (C1-04)
This setting functions the same as Setting 1 [Deceleration Time 1 (C1-02)]. When you enable the Stall Prevention
function, the drive decelerates in the time set in C1-04 [Deceleration Time 2].
3 : Intelligent (Ignore Decel Ramp)
Enabled when A1-02 = 8 [EZOLV]. The drive operates with the largest possible output current to prevent motor
stalling.
YASKAWA SIEPC71061753A GA500 Technical Manual
V/f OLV OLV/PM AOLV/PM EZOLV OLV/PM
Sets the function to enable and disable Stall Prevention During Run.
12.9 L: Protection Functions
Description
Default
(Range)
Determined by A1-02
(0 - Determined by A1-02)
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