Grundfos UPMS - Page 16

8.2.4 0-10 VDC
The UPMS circulators can be externally speed-controlled by an
analog 0-10 VDC signal.
The pump requires a 0-10 V signal on the signal port to control the
speed of the pump. The pump will run at its maximum speed if the
signal fails (cable break).
2
3
4
1
Z
O
Z
I
GNDS
GNDS
GNDS
TM085628
Schematic drawing, equivalent interface
Pos. Description
1 Galvanic isolation
2 Alarm output signal
3
Signal reference (without connection to protective
ground)
4 0-10 VDC input
Profile R
0.5 4 5
U[V]
1 2 3 96 7 8 10
1
2
3
TM070784
Profile R
Pos. Description
1 Max.
2 Min.
3 Stop
U [V] Pump status
0 < U ≤ 0.5 Max. speed
0.5 < U ≤ 1 Standby (Stop)
1 < U ≤ 2 Hysteresis
2 < U ≤ 3 Min. speed
3 < U ≤ 10 Speed between min. and max.
Alarm output signal
An alarm output signal is available.
Output transistor status indicates pump operation.
The output signal is activated in the following cases:
• The pump stops when the input signal is between 0.5 and 2 V.
• The pump stops because of an alarm and the input signal is
between 2 and 10 V.
Output signal is not activated in the following cases:
• Pump fault.
• The pump is running (input voltage is above 0.5 V).
100
90
80
70
60
50
40
30
20
10
A
B
%
TM070578
Output profile 0-10 VDC
Pos. Alarm output signal % Description
A 100
Standby (stop) or alarm
stop
B 0 Pump is running.
0-10 VDC Symbol Value
Operating voltage
U
I
0-10 V
Input impedance
Z
I
≥ 50 kΩ
Max input voltage - 26 V
Continuous short
circuit protection
- Yes
Reverse polarity
protection
-
Yes, Limit: 26 V, 20
mA
Alarm output signal
State
Symbol Value
Off
Z
O, off
> 100 kΩ
On
Z
O, on
< 500 Ω
16
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