Grundfos CRE User Manual

11.5 Inputs/outputs
Ground reference
All voltages refer to ground. All currents return to ground.
Absolute maximum voltage and current limits
Exceeding the following electrical limits may result in severely
reduced operating reliability and motor life:
Relay 1:
Maximum contact load: 250 VAC, 2 A or 30 VDC, 2 A.
Relay 2:
Maximum contact load: 30 VDC, 2 A.
GENI terminals: -5.5 to 9.0 VDC or less than 25 mADC.
Other input/output terminals: -0.5 to 26 VDC or less than 15 mADC.
Digital inputs, DI
Internal pull-up current greater than 10 mA at V
i
equal 0 VDC.
Internal pull-up to 5 VDC (currentless for V
i
greater than 5 VDC).
Certain low logic level: V
i
less than 1.5 VDC.
Certain high logic level: V
i
greater than 3.0 VDC.
Hysteresis: No.
Screened cable: 0.5 - 1.5 mm
2
, 28-16 AWG.
Maximum cable length: 1640 ft (500 m).
Open-collector digital outputs, OC
Current sinking capability: 75 mADC, no current sourcing.
Load types: Resistive or/and inductive.
Low-state output voltage at 75 mADC: Maximum 1.2 VDC.
Low-state output voltage at 10 mADC: Maximum 0.6 VDC.
Overcurrent protection: Yes.
Screened cable: 0.5 - 1.5 mm
2
, 28-16 AWG.
Maximum cable length: 1640 ft (500 m).
Analog inputs, AI
Voltage signal ranges:
• 0.5 - 3.5 VDC, AL AU.
• 0-5 VDC, AU.
• 0-10 VDC, AU.
Voltage signal: R
i
greater than 100 kΩ at 25 °C.
Leak currents may occur at high operating temperatures. Keep the
source impedance low.
Current signal ranges:
• 0-20 mADC, AU.
• 4-20 mADC, AL AU.
Current signal: R
i
is equal 292 Ω.
Current overload protection: Yes. Change to voltage signal.
Measurement tolerance: -0 / +3 % of full scale (maximum-point
coverage).
Screened cable: 0.5 - 1.5 mm
2
, 28-16 AWG.
Maximum cable length: 500 m excluding potentiometer.
Potentiometer connected to +5 V, GND, any AI:
Use maximum 10 kΩ.
Maximum cable length: 100 m.
Analog output, AO
Current sourcing capability only.
Voltage signal:
• Range: 0-10 VDC.
• Minimum load between AO and GND: 1 kΩ.
• Short-circuit protection: Yes.
Current signal:
• Ranges: 0-20 and 4-20 mADC.
• Maximum load between AO and GND: 500 Ω.
• Open-circuit protection: Yes.
Tolerance: -0 / +4 % of full scale (maximum-point coverage).
Screened cable: 0.5 - 1.5 mm
2
, 28-16 AWG.
Maximum cable length: 1640 ft (500 m).
Pt100/1000 inputs, Pt
Temperature range:
• Minimum: -22 °F (-30 °C). 88 Ω / 882 Ω.
• Maximum: 356 °F (180 °C). 168 Ω / 1685 Ω.
Measurement tolerance: ± 2.5 °F (± 1.5 °C).
Measurement resolution: < 0.5 °F (0.3 °C).
Automatic range detection, Pt100 or Pt1000: Yes.
Sensor fault alarm: Yes.
Screened cable: 0.5 - 1.5 mm
2
, 28-16 AWG.
Use Pt100 for short wires.
Use Pt1000 for long wires.
LiqTec sensor inputs
Use Grundfos LiqTec sensor only.
Screened cable: 0.5 - 1.5 mm
2
, 28-16 AWG.
Grundfos Digital Sensor input and output, GDS
Use Grundfos Digital Sensor only.
Power supplies
+5 V:
• Output voltage: 5 VDC -5 % / +5 %.
• Maximum current: 50 mADC (sourcing only).
• Overload protection: Yes.
+24 V:
• Output voltage: 24 VDC -5 % / +5 %.
• Maximum current: 60 mADC (sourcing only).
• Overload protection: Yes.
Digital outputs, relays
Potential-free changeover contacts.
Minimum contact load when in use: 5 VDC, 10 mA.
Screened cable: 0.5 - 2.5 mm
2
, 28-12 AWG.
Maximum cable length: 1640 ft (500 m).
Bus input
Grundfos GENIbus protocol, RS-485.
Screened 3-core cable: 0.5 - 1.5 mm
2
, 28-16 AWG.
Maximum cable length: 1640 ft (500 m).
64
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