Xylem ECOCIRC XL & XLplus - Manual (Page 24)

5.2.8 PWM input (available only on 25-40,
25-60, 32-40, 32-60 models)
Only on the listed models, the PWM input is availa-
ble on terminals 11 and 12. See Figure 18 .
The PWM signal shares the same terminals of the
start/stop input.
The two inputs are mutually exclusive.
For details, refer to advanced functions manual on
www.lowara.com
5.2.9 Analog Input
The pump integrates a 0-10 V analog input at ter-
minals 7 and 8. See Figure 18 and Figure 19 for
changing the set point.
When a voltage input is detected, the pump switch
to fix speed control mode automatically and start
to work according to the following diagram:
Vin[V]
Speed
[rpm]
Vset 10 1,5 1,2
min
Max
Setpoint
5.2.10 Signal relay
The pump is equipped with a relay, terminals 4 and
5. See Figure 18 and Figure 19 , for a potential-free
fault signal. If there is a fault the relay is activated
together with the red status light and the error
code on the user interface display, Figure 13 .
Ratings
• Vmax < 250 VAC
• Imax < 2 A
5.2.11 External sensors
The pump can be equipped with a differential
pressure sensor and a temperature probe accord-
ing to the following table:
Sensor descrip-
tion
Type Terminals
Differential
pressure sensor
4-20mA
1.0 bar (PN 10)
2.0 bar (PN 10) 9 - 10
External tem-
perature sensor
KTY83 13 - 14
Pressure sensor setup
1. Install the pressure sensor on the pipe
2. Connect the cable at terminals 9 and 10 (see
the 4.6.3 Connection assignment).
3. Power on the pump unit.
4. During startup the pump unit detects the sen-
sor and shows a setup menu.
5. Select the right sensor model and confirm the
selection using the parameter button (3). See
Figure 13 .
6. The pump will complete the startup sequence
and automatically start working with constant
pressure mode.
7. The setpoint can be changed using the setting
buttons (5). See Figure 13 .
External temperature sensor setup (only for eco-
circ XLplus)
The setup of the sensor and control modes related
to it, is available only through communication bus.
For details refer to communication and advanced
functions manuals on www.lowara.com
NOTICE:
The sensor cables shall not exceed 20 m.
5.2.12 Communication bus (available only
on ecocirc XLplus)
The pump has two built-in RS-485 communication
channels. One is available as standard (terminals
15-16-17), while the second one is enabled only
with optional RS-485 or Wireless module (terminals
18-19-20). See Figure 18 and Figure 19 .
The pump can communicate with external BMS sys-
tems via Modbus or BACnet 12 protocol. For a com-
plete description of the protocols, refer to the com-
munication manual at www.lowara.com.
NOTICE:
When remote control is active, the set points and
control modes are managed only through commu-
nication channels and cannot be changed via the
user interface. The displayed quantity and unit of
measurement management remain active on user
interface.
5.2.13 Automatic twin pump operation
(available only on ecocirc XLplus)
Backup operation
Only the master pump runs. The second pump
starts in case of failure of the master pump.
Alternate operation
Only one pump runs at the time. The working time
is switched every 24 hours so that workload is bal-
anced between both pumps. The second pump is
started immediately in case of failure.
Parallel operation
Both pumps run simultaneously with the same set
point. The master pump determines the behavior
of the full system and is able to optimize the per-
formance. To guarantee the required performance
with the minimum power consumption, the master
pump starts or stops the second pump depending
on the head and flow that is required.
• NOTE: If an ecocirc XL basic (no communication
available) is used in parallel operation, the two
pump-heads may work in different duty points,
especially at low flow. This could create some
12 Not available on 25-40, 25-60, 32-40, 32-60 models.
en - Translation of the original instructions
24