Automation Direct DURApulse GS4 User Manual page 144

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 ().
Motor Maximum Output Voltage
Middle Output Voltage 1
Middle Output Voltage 2
Minimum Output Voltage
(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 = [(P0�00-P2�09) x ([(F
out
• Where: V
• Refer to "Energy Saving Power Curves for Fans & Pumps" V/Hz curve below Setting 05�
Setting 5: Square Curve
• V = [(P0�00-P2�09) x ([(F
out
• Where: V
• Refer to "Energy Saving Power Curves for Fans & Pumps" V/Hz curve below�
e S
nergy aving
Page 4–50
Volt a ge
P6.26 Output Frequency Lower limit
P0.00 (P0.11)
P2.05 (P2.13)
P2.07 (P0.15)
P2.09 (P2.17)
P2.08
(P2.16)
Min Freq
-P2�08)/(P0�00-P2�09)]
x
is GS4 drive output voltage; F
out
-P2�08)/(P0�00-P2�09)]
x
is GS4 drive output voltage; F
out
P c F & P
ower urveS For anS
P0.00 Voltage %
100
90
80
70
60
50
40
30
20
10
0
DURA
pulse
V/Hz Curve
Fr e q u e n cy o u tp u t
ranges limitation
P2.19 P2.04
P2.06
Start Freq (P2.12)
(P2.14)
Mid Freq1
Mid Freq2
3 ) 0�5 ] + P2�09
is GS4 drive output frequency
x
2 )] + P2�09
is GS4 drive output frequency
x
(P2.00 S 04 & 05)
uMPS eTTingS
1.5 power c urve
Square curve
20 40 60 80
GS4 AC Drive User Manual – 1st Ed, Rev A - 10/20/2017
P6.25 Output Frequency Upper Limit
Re g u l a r V /Hz Cu r ve
S p e ci a l V /Hz Cu r ve
Fre que nc y
P0.04
P0.02
(P0.13)
Base Freq
P0.02 Hertz %
100