Yaskawa Z1000U HVAC Matrix Bypass - Manual (Page 186)

Frequency reference
L3-14
15% of rated current
Figure 5.43 Deceleration for Current Limit
n L3-06: Stall Prevention Level during Run
Sets the current level to trigger Stall Prevention during run. Depending on the setting of parameter L3-23, the level is
automatically reduced in the constant power range (speed beyond base speed).
The Stall Prevention level can be adjusted using an analog input.
Refer to Multi-Function Analog Input Terminal Settings
on page 178 for details.
No. Name Setting Range Default
L3-06 Stall Prevention Level During Run 30 to 150 <1> <1>
<1> The upper limit and default values are determined by parameter L8-38, Carrier Frequency Derating Selection.
u L4: Reference Detection
These parameters set up the Loss of Frequency Reference function.
n L4-01, L4-02: Speed Agree Detection Level and Detection Width
Parameter L4-01 sets the detection level for the digital output functions Speed agree 1, User-set speed agree 1, Frequency
detection 1, and Frequency detection 2.
Parameter L4-02 sets the hysteresis level for these functions.
No. Name Setting Range Default
L4-01 Speed Agree Detection Level 0.0 to 400.0 Hz 0.0 Hz
L4-02 Speed Agree Detection Width 0.0 to 20.0 Hz 2.0 Hz
Refer to H2-01 to H2-03: Terminal M1-M2, M3-M4, and MD-ME-MF Function Selection on page 167 , Settings 2, 3, 4,
and 5.
n L4-03, L4-04: Speed Agree Detection Level and Detection Width (+/-)
Parameter L4-03 sets the detection level for the digital output functions Speed agree 2, User-set speed agree 2, Frequency
detection 3, and Frequency detection 4.
Parameter L4-04 sets the hysteresis level for these functions.
No. Name Setting Range Default
L4-03 Speed Agree Detection Level (+/-) -400.0 to 400.0 Hz 0.0 Hz
L4-04 Speed Agree Detection Width (+/-) 0.0 to 20.0 Hz 2.0 Hz
Refer to H2-01 to H2-03: Terminal M1-M2, M3-M4, and MD-ME-MF Function Selection on page 167 , Settings 13, 14,
15, and 16.
n L4-05: Frequency Reference Loss Detection Selection
The drive can detect a loss of an analog frequency reference from input A1, A2, or A3. Frequency reference loss is detected
when the frequency reference drops below 10% of the reference or below 5% of the maximum output frequency within 400
ms.
5.8 L: Protection Functions
186 YASKAWA SIEP YAIZ1D 01A Z1000U HVAC MATRIX Drive Bypass Technical Manual