Technical Data; Three-Phase Pumps, 20-30 Hp - Grundfos CRE Instructions Manual

9. Technical data

9.1 Three-phase pumps, 20-30 hp

9.1.1 Supply voltage
3 x 460-480 V - 10 %/+ 10 %, 50/60 Hz - 3 %/+ 3 %, PE.
2
Cable: Max. 10 mm / 8 AWG.
Use min. 158 °F (70 °C) copper conductors only.
Recommended fuse sizes
Motor size [hp]
20
25
30
Standard as well as quick-blow or slow-blow fuses may be used.
9.1.2 Overload protection
The overload protection of the E-motor has the same characteristic
as an ordinary motor protector. As an example, the E-motor can
stand an overload of 110 % of I
nom
9.1.3 Leakage current
Ground leakage current > 10 mA.
The leakage currents are measured in accordance with EN
61800-5-1.
9.1.4 Inputs/output
Start/stop
External potential-free contact.
Voltage: 5 VDC.
Current: < 5 mA.
2
Screened cable: 0.5 - 1.5 mm / 28-16 AWG.
Digital
External potential-free contact.
Voltage: 5 VDC.
Current: < 5 mA.
2
Screened cable: 0.5 - 1.5 mm / 28-16 AWG.
Setpoint signals
• Potentiometer
0-10 VDC, 10 kΩ (via internal voltage supply).
Screened cable: 0.5 - 1.5 mm
Maximum cable length: 328 ft.
• Voltage signal
0-10 VDC, R > 50 kΩ.
i
Tolerance: + 0 %/- 3 % at maximum voltage signal.
Screened cable: 0.5 - 1.5 mm
Maximum cable length: 1640 ft.
• Current signal
DC 0-20 mA/4-20 mA, R = 250 Ω.
i
Tolerance: + 0 %/- 3 % at maximum current signal.
Screened cable: 0.5 - 1.5 mm
Maximum cable length: 1640 ft.
Sensor signals
• Voltage signal
0-10 VDC, R > 50 kΩ (via internal voltage supply).
i
Tolerance: + 0 %/- 3 % at maximum voltage signal.
Screened cable: 0.5 - 1.5 mm
Maximum cable length: 1640 ft.
• Current signal
DC 0-20 mA/4-20 mA, R = 250 Ω.
i
Tolerance: + 0 %/- 3 % at maximum current signal.
Max. [A]
36
43
51
for 1 min.
2
/ 28-16 AWG.
2
/ 28-16 AWG.
2
/ 28-16 AWG.
2
/ 28-16 AWG.
Screened cable: 0.5 - 1.5 mm
Maximum cable length: 1640 ft.
Internal power supplies
• 10 V power supply for external potentiometer:
Max. load: 2.5 mA.
Short-circuit protected.
• 24 V power supply for sensors:
Max. load: 40 mA.
Short-circuit protected.
Signal relay output
Potential-free changeover contact.
Maximum contact load: 250 VAC, 2 A, cos φ 0.3 - 1.
Minimum contact load: 5 VDC, 10 mA.
2
Screened cable: 0.5 - 2.5 mm / 28-12 AWG.
Maximum cable length: 1640 ft.
Bus input
Grundfos bus protocol, GENIbus protocol, RS-485.
Screened 3-core cable: 0.2 - 1.5 mm
Maximum cable length: 1640 ft.
2
/ 28-16 AWG.
2
/ 28-16 AWG.
35