Automation Direct DURApulse GS4 - Page 144

Page 4–50
DURApulse GS4 AC Drive User Manual – 1st Ed, Rev A - 10/20/2017
Chapter 4: AC Drive Parameters
Setting 3: Custom
The setting of a custom V/Hz curve usually follows the load characteristics of a motor. If the
workload exceeds a motor’s capacity, pay attention to its heat dissipation, dynamic balance, and
bearing lubrication.
Custom V/Hz curves are used when “General Purpose,” “High Starting Torque,” or “Fan and Pump”
curves do not deliver the voltage required for the application.
If the voltage setting at low frequency is set to too high a value, it can cause motor insulation or
coil damage through motor overheating, cause a motor stall prevention event, and/or contribute
to over current protection faults. Care must be given to the determination of this parameter’s
value to best protect the motor and provide the best application experience.
The V/Hz curve of Motor 1 is shown below. The V/Hz Curve of Motor 2 will be similar, using
comparable parameters for Motor 2 as shown in ().
P2.06
(P2.14)
Mid Freq2
P2.04
(P2.12)
Mid Freq1
P0.02
(P0.13)
Base Freq
P0.04
P2.08
(P2.16)
Min Freq
P2.19
Start Freq
P6.26 Output Frequency Lower limit P6.25 Output Frequency Upper Limit
Motor Maximum Output Voltage
P0.00 (P0.11)
Frequency output
ranges limitation
Regular V/Hz Curv
e
Special V/Hz Curve
Voltage
V/Hz Curve
Middle Output Voltage 1
P2.05 (P2.13)
Middle Output Voltage 2
P2.07 (P0.15)
Minimum Output Voltage
P2.09 (P2.17)
Frequency
(Px.xx) = parameters for motor #2
NOTE: P2.04~P2.09 and P2.12~17 are used only when the V/Hz parameter (P2.00) is set to
03.
Setting 4: 1.5 Power Curve
• V
out
= [(P0�00-P2�09) x ([(F
x
-P2�08)/(P0�00-P2�09)]
3
)
0�5
] + P2�09
• Where: V
out
is GS4 drive output voltage; F
x
is GS4 drive output frequency
• Refer to “Energy Saving Power Curves for Fans & Pumps” V/Hz curve below Setting 05�
Setting 5: Square Curve
• V
out
= [(P0�00-P2�09) x ([(F
x
-P2�08)/(P0�00-P2�09)]
2
)] + P2�09
• Where: V
out
is GS4 drive output voltage; F
x
is GS4 drive output frequency
• Refer to “Energy Saving Power Curves for Fans & Pumps” V/Hz curve below�
energy Saving Power curveS For FanS & PuMPS (P2.00 SeTTingS 04 & 05)
0
20 40 60 80 100
100
90
80
70
60
50
40
30
20
10
P0.00 Voltage %
1.5 power curve
Square curve
P0.02 Hertz %