Yaskawa Z1000U HVAC Matrix Bypass - Manual (Page 157)

u d2: Frequency Upper/Lower Limits
Upper and lower frequency limits prevent motor speed from going above or below levels that may cause resonance or
equipment damage.
n d2-01: Frequency Reference Upper Limit
Sets the maximum frequency reference as a percentage of the maximum output frequency. This limit applies to all frequency
references.
Even if the frequency reference is set to a higher value, the drive internal frequency reference will not exceed this value.
No. Parameter Name Setting Range Default
d2-01 Frequency Reference Upper Limit 0.0 to 110.0% 100.0%
Note: This value is overwritten by the energy savings function. When energy savings is enabled, (Z1-16 = 1 or 2), this value will be set to 110%.
When energy savings is not enabled (Z1-16 = 0), the bypass controller will not change this value.
n d2-02: Frequency Reference Lower Limit
Sets the minimum frequency reference as a percentage of the maximum output frequency. This limit applies to all frequency
references.
If a lower reference than this value is entered, the drive will run at the limit set to d2-02. If the drive is started with a lower
reference than d2-02, it will accelerate up to d2-02.
No. Parameter Name Setting Range Default
d2-02 Frequency Reference Lower Limit 0.0 to 110.0% 0.0%
Internal frequency
reference
d2-01
Operating
range
Frequency Reference Upper Limit
Set frequency reference
Frequency Reference Lower Limit
d2-02
Figure 5.16 Frequency Reference: Upper and Lower Limits
n d2-03: Master Speed Reference Lower Limit
Sets a lower limit as a percentage of the maximum output frequency that will only affect a frequency reference entered from
the analog input terminals (A1, A2, or A3) as the master speed reference. This is unlike parameter d2-02, which affects all
frequency references regardless of their source.
Note: When lower limits are set to both parameters d2-02 and d2-03, the drive uses the greater of those two values as the lower limit.
No. Parameter Name Setting Range Default
d2-03 Master Speed Reference Lower Limit 0.0 to 110.0% 0.0%
5.4 d: Reference Settings
YASKAWA SIEP YAIZ1D 01A Z1000U HVAC MATRIX Drive Bypass Technical Manual 157
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Programming