31
11.4 Electrical data
Terminal
Designation or number
Function PFU 2000 Technical data
L, N, PE Voltage supply for PFU 2000. 1 x 230-240 V –10%/+6%, 50 Hz, PE.
A, Y, B
Communication among the units in the GRUNDFOS
Pump Management System 2000.
GRUNDFOS BUS. RS-485, GRUNDFOS BUS proto-
col.
1 - 4
Analog/digital input for motor protection.
Motors 1, 2, 3, 4.
PTC or thermal switch (NC).
PTC according to DIN 44081 or 44082.
5 Monitoring of frequency converter. NC contact.
6 Analog control signal for frequency converter. DC 0-10 V.
7 Connection of external LED (fault). Positive (anode), maximum 5 mA.
8 Connection of external LED (operation). Positive (anode), maximum 5 mA.
11 and 13 DC 24 V supply for transmitter. Maximum 70 mA.
12
Analog input 1:
Actual value in the system.
Note: In systems without PMU 2000, pressure trans-
mitters with the following possible signal values are
typically used: 0-10 V, 0-20 mA and 4-20 mA.
In systems with PMU 2000, pressure, differential-pres-
sure or temperature transmitters can be used.
0-10 V.
0-20 mA.
4-20 mA.
NTC 50:
Measuring range: –25°C to +50°C.
Resistance value at 25°C : 30 kŸ.
NTC 150:
Measuring range: 0°C to +150°C.
Resistance value at 25°C : 100 kŸ.
14
Analog input 2:
Input for pressure, pre-pressure, flow-pipe and return-
pipe temperature measuring.
Note: In all systems without PMU 2000, this input is
always used for pre-pressure measuring.
Input signal can be inverted by means of the DIP 1 con-
tact 4.
0-10 V.
0-20 mA.
4-20 mA.
On/off contact (digital).
NTC 50:
Measuring range: –25°C to +50°C.
Resistance value at 25°C : 30 kŸ.
NTC 150:
Measuring range: 0°C to +150°C.
Resistance value at 25°C : 100 kŸ.
15
Analog input 3:
Signal for remote setting of setpoint.
Note: In systems without PMU 2000, only DC 0-10 V
can be used.
DC 0-10 V.
0-20 mA.
4-20 mA.
16
Digital input 4: (Without PMU 2000)
For pressure boosting and water supply applications,
input 4 is laid out for a flow switch.
For heating, air-conditioning and ventilation systems,
input 4 is laid out for an external on/off switch.
Maximum contact load: 12 V / 12 mA.
17
Connection of external reset button, for instance in the
front cover of the control cabinet, or external potentio-
meter for the setting of setpoint.
Maximum contact load: 12 V / 12 mA.
20 and 30 Contactor coil voltage.
29 Frequency converter on/off.
21, 22, 23, 24 On/off of motors 1, 2, 3, 4. Mains operation. Maximum contact load: 250 V / 8 A, AC1.
25, 26, 27, 28
On/off of motors 1, 2, 3, 4.
Frequency converter operation.
Maximum contact load: 250 V / 8 A, AC1.
31 - 33
Fault signal relay. Potential-free changeover contacts.
Maximum contact load: 250 V / 0.5 A, AC1.
41 - 43
Operating signal relay. Potential-free changeover contacts.
Maximum contact load: 250 V / 0.5 A, AC1.
Terminal
Designation or number
Function PMU 2000 Technical data
L, N, PE Voltage supply for PMU 2000. 1 x 230-240 V –10%/+6%, 50 Hz, PE.
1, 2, 3
Operating signal relay. Potential-free changeover contacts.
Maximum contact load: 250 V / 1.0 A, AC1.
4, 5, 6
Fault signal relay. Potential-free changeover contacts.
Maximum contact load: 250 V / 1.0 A, AC1.
7, 8, 9
Communication among the units in the GRUNDFOS
Pump Management System 2000.
GRUNDFOS BUS. RS-485, GRUNDFOS BUS proto-
col.
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