Eng
lish (US)
20
17.4 Sound pressure level
For sound pressure level, see installation and operating
instructions for the CM pumps.
The sound pressure level for a number of pumps can be
calculated as follows:
L
max.
= L
pump
+ (n - 1) x 3
L
max.
= Maximum sound pressure level
L
pump
= Sound pressure level for one pump
n
= Number of pumps.
18. Electrical data
Supply voltage
See Hydro Multi-B nameplate.
Digital inputs
Analog inputs
Digital outputs (relay outputs)
All digital outputs are potential-free relay contacts.
Inputs for PTC sensor/thermal switch
For PTC sensors to DIN 44082. Thermal switches can also be
connected.
18.1 Disposal
This product or parts of it must be disposed of in an
environmentally sound way:
1. Use the public or private waste collection service.
2. If this is not possible, contact the nearest Grundfos company
or service workshop.
Subject to alterations.
Note
Note
Considering the flow in pipes, vibrations, etc.,
the actual sound pressure level of the
Hydro Multi-B system will be lower than 90 dB(A).
Open-circuit voltage
24 VDC
Closed-circuit current
5 mA, DC
Frequency range
0-4 Hz
Note
Note
All digital inputs are supplied with PELV voltage
(Protective Extra-Low Voltage).
Input current and voltage
0-20 mA
4-20 mA
0-10 V
Tolerance
± 3.3 % of full scale
Repetitive accuracy
± 1 % of full scale
Input resistance, current
< 250
Ω
Input resistance, voltage
10 k
Ω
± 10 %
Supply to sensor
24 V, maximum 50 mA per
sensor, short-circuit-protected
Note
Note
All analog inputs are supplied with PELV voltage
(Protective Extra-Low Voltage).
Normally open contacts
(DO1, DO2 and DO3)
C, NO
Normally closed contacts
(DO4 and DO5)
C, NC, NO
Maximum contact load
240 VAC, 2 A
Minimum contact load
5 VDC, 10 mA
Note
Note
Some outputs have a common C terminal. For
further information, see the wiring diagram
supplied with the Hydro Multi-B.
Open-circuit voltage
8 VDC ± 15 %
Closed-circuit current
1.7 mA, DC
Note
Note
Inputs for PTC sensors are electrically separated
from the other inputs and outputs of the Hydro
Multi-B.
