Grundfos CRE Instructions

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.
Cable: Max. 10 mm
2
/ 8 AWG.
Use min. 158 °F (70 °C) copper conductors only.
Recommended fuse sizes
Motor size [hp] Max. [A]
20 36
25 43
30 51
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
for 1 min.
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.
Screened cable: 0.5 - 1.5 mm
2
/ 28-16 AWG.
Digital
External potential-free contact.
Voltage: 5 VDC.
Current: < 5 mA.
Screened cable: 0.5 - 1.5 mm
2
/ 28-16 AWG.
Setpoint signals
• Potentiometer
0-10 VDC, 10 kΩ (via internal voltage supply).
Screened cable: 0.5 - 1.5 mm
2
/ 28-16 AWG.
Maximum cable length: 328 ft.
• Voltage signal
0-10 VDC, R
i
> 50 kΩ.
Tolerance: + 0 %/- 3 % at maximum voltage signal.
Screened cable: 0.5 - 1.5 mm
2
/ 28-16 AWG.
Maximum cable length: 1640 ft.
• Current signal
DC 0-20 mA/4-20 mA, R
i
= 250 Ω.
Tolerance: + 0 %/- 3 % at maximum current signal.
Screened cable: 0.5 - 1.5 mm
2
/ 28-16 AWG.
Maximum cable length: 1640 ft.
Sensor signals
• Voltage signal
0-10 VDC, R
i
> 50 kΩ (via internal voltage supply).
Tolerance: + 0 %/- 3 % at maximum voltage signal.
Screened cable: 0.5 - 1.5 mm
2
/ 28-16 AWG.
Maximum cable length: 1640 ft.
• Current signal
DC 0-20 mA/4-20 mA, R
i
= 250 Ω.
Tolerance: + 0 %/- 3 % at maximum current signal.
Screened cable: 0.5 - 1.5 mm
2
/ 28-16 AWG.
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.
Screened cable: 0.5 - 2.5 mm
2
/ 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
2
/ 28-16 AWG.
Maximum cable length: 1640 ft.
35
English (US)

Grundfos CRE Specifications

General

Protection Class	IP55
Material	Stainless Steel
Applications	Water supply, pressure boosting, irrigation
Impeller Material	Stainless Steel
Pump Housing Material	Stainless Steel
Connection Size	DN32 to DN200 (depending on model)
Power Supply	3-phase
Control	Integrated frequency converter