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EP20-XXXXX-XXX-XXX (en)
14. PERFORMANCE CURVE
There are two primary VFD settings needed to navigate the pump operating map. The commanded frequency will control the pump
speed (flow), and the motor torque limit (parameter 416) will limit the maximum torque that the motor will output which will in turn
limit the pump pressure. The pump will run at the commanded speed until the backpressure in the system exceeds the motor torque
limit shown by the horizontal dotted lines. When this happens, the pump will begin to de-rate its speed to maintain a constant torque
output. This will continue until there is zero flow in the system, but full pressure. When the pressure downstream is reduced, the pump
will speed up until the speed reaches its commanded frequency. To limit the pressure in the system, the torque limit can be set less
than 100%. When backpressure builds, the pump will begin to de-rate its speed at a lower pressure where it intersects its respective
curve for that given torque limit.
EP20-XXXXX-XXX-XXA 2" EVO ELECTRIC DIAPHRAGM PUMP
(METALLIC FLUID SECTION)
NPSH REQUIRED IN FEET
CAPACITY IN U.S. GALLONS PER MINUTE
TOTAL DISCHARGED (2.31 FT = PSIG)
NPSH REQUIRED IN METERS
TOTAL DISCHARGED HEAD (BAR)
FLOW RATE (LITERS / MIN.)
0
4
8
12
16
20
0
2
4
6
8
10
0
60
120
180
240
300
360
420
480
540
600
0
5
10
15
20
25
30
35
40
45
50
55
60
0
20
40
60
80
100
120
140
0
20
40
60
80
100
120
140
160
Performance based on water
at ambient temperature.
80% T
60% T
40% T
20% T
14 Hz
28 Hz
42 Hz
56 Hz
70 Hz
NP
SHr
84 Hz
-
-
Drive Controls:
Motor Frequency (Main Menu)
Torque Limit (Menu 4 - 16)
Torque limit ≈ Discharge Head
Motor Frequency ≈ Flow
80% T
60% T
40% T
20% T
14 Hz
42 Hz
56 Hz
NPS
Hr
70 Hz
28 Hz
Performance based on water
at ambient temperature.
84 Hz
