Wilo Control EC-WP Series Installation And Operating Instructions Manual page 37

7.1 Functional principle
7.1.1 "Level control" operating principle
7.1.2 "Pressure control" operating prin-
ciple
7.1.3 Pump cycling
7.1.4 Standby pump
7.1.5 Dry-running protection system
Installation and operating instructions • Wilo-Control EC-WP • Ed.01/2024-08
In automatic mode, the pumps are switched on and off depending on the water level and
control mode. During operation, a visual indicator appears on the LCD display and the green
LED lights up. If two pumps are connected, pump cycling is carried out every time the pump
is switched off to optimise the pump running times.
An alarm signal is shown on the LCD display in case of a fault. If more than one pump is
connected, automatic changeover to a fully-functional pump occurs. The internal buzzer
can emit an audible alarm signal. Furthermore, the outputs for the collective fault signal
(SSM) and individual fault signal (ESM) are activated. The output for the external alarm sig-
nal is activated in parallel to the collective fault signal output. This can also be used to con-
trol an external alarm.
Monitoring for the dry-running and high water level works as follows:
• Dry-running protection system
Monitoring always refers to the fill level on the pump. If the water level falls below the
dry-running level, the pump(s) undergo(es) forced switch-off.
• High water
Monitoring always refers to the fill level in the tank. If the high water level is exceeded,
the pump(s) undergo(es) forced switch-off.
An alarm signal is also shown on the LCD display. The internal buzzer can emit an audible
alarm signal. Furthermore, the output for the collective fault signal (SSM) is activated. The
output for the external alarm signal is activated in parallel to the collective fault signal out-
put. This can also be used to control an external alarm.
In automatic mode, the system maintains the specified pressure. As soon as the pressure in
the tank falls below the set pressure, the pumps are switched on. When the pressure in the
tank exceeds the set pressure again, the pumps are switched off. If two pumps are connec-
ted, pump cycling is carried out every time the pump is switched off to optimise the pump
running times.
An alarm signal is shown on the LCD display in case of a fault. If more than one pump is
connected, automatic changeover to a fully-functional pump occurs. The internal buzzer
can emit an audible alarm signal. Furthermore, the outputs for the collective fault signal
(SSM) and individual fault signal (ESM) are activated. The output for the external alarm sig-
nal is activated in parallel to the collective fault signal output. This can also be used to con-
trol an external alarm.
Monitoring for the dry-running level works as follows:
• Dry-running protection system
Monitoring always refers to the fill level on the pump. If the water level falls below the
dry-running level, the pump(s) undergo(es) forced switch-off.
An alarm signal is also shown on the LCD display. The internal buzzer can emit an audible
alarm signal. Furthermore, the output for the collective fault signal (SSM) is activated. The
output for the external alarm signal is activated in parallel to the collective fault signal out-
put. This can also be used to control an external alarm.
To prevent irregular running times of the individual pumps, the base-load pump is regularly
cycled if there are two pumps. When all pumps are switched off, the base-load pump will
change the next time the system is activated.
Additionally, repeated pump cycling is activated as a factory setting. This causes the base-
load pump to be switched every 6 hours. NOTICE! To deactivate this function: Menu 5.60!
One pump can be used as a standby pump. This pump is not activated during normal opera-
tion. The standby pump is only activated in the event of pump failure due to a fault. The
standby pump is subject to standstill monitoring. The standby pump is therefore activated
during pump cycling and pump kick.
To protect the pumps from a dry run, a float switch or an electrode can also be installed in
the well:
• Contact type: Normally open contact
• Float switch operating principle:
–
Top contact = closed
–
Bottom contact = open
en
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