Wilo Control EC-L1 Series Installation And Operating Instructions Manual page 26

en
7.1.1 Priority when dry run and high wa-
ter signals are present simultan-
eously
7.1.2 Pump cycling
7.1.3 Forced switching of the pumps in
case of dry run, min. water level or
high water
7.1.4 Operation with a defective level
sensor
26
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. Additionally, the in-
ternal buzzer can emit an audible alarm signal. Furthermore, the outputs for the collective
fault signal (SSM) and individual fault signal (ESM) are activated.
Upon reaching the dry run or high water level, the following occurs depending on the oper-
ating mode:
• Forced shutdown of all pumps.
• Forced activation of all pumps.
An alarm signal is also shown on the LCD display. Additionally, the internal buzzer can emit
an audible alarm signal. Furthermore, the output for the collective fault signal (SSM) is ac-
tivated.
If the system malfunctions, it may happen that both signals are present at the same time. In
this case, the priority is dependent upon the selected operating mode and thus the reaction
of the switchgear:
• Operating mode "drain"
1. Dry-running protection
2. High water
• "Fill" operating mode
1. Dry-running protection/low water (via "Extern OFF" input)
2. High water
3. Min. water level
To prevent irregular running times of the individual pumps, general pump cycling takes
place. This means that all pumps work alternately.
Forced switching depends on the selected operating mode:
• High water level
Operating mode "drain": A forced switch-on* of all pumps always occurs, irrespective
of the signal transmitter used.
Operating mode "fill": A forced switch-off of all pumps always occurs, irrespective of
the signal transmitter used.
• Dry-running level
Operating mode "drain": A forced switch-off of all pumps always occurs, irrespective of
the signal transmitter used.
Operating mode "fill": Realise dry-running protection via the "Extern OFF" input.
• Min. water level
Operating mode "fill": A forced switch-on* of all pumps always occurs, irrespective of
the signal transmitter used.
NOTICE! Forced switch-on
The following preconditions must be fulfilled so that a forced switch-on can be performed:
• Pumps are enabled (menu 3.01 to 3.04).
• The "Extern OFF" input is not active.
If the level sensor does not transfer a measured value (e.g. due to wire break, defective
sensor), all pumps are switched off. Furthermore, the fault signal LED lights up and the col-
lective fault signal is activated.
Emergency operation
• Operating mode "drain": High water level
If the high water level is performed by a separate float switch, the system can continue
running in emergency operation. The activation and deactivation points are defined by
the hysteresis of the float switch.
• Operating mode "fill": Min. water level
If the min. water level is monitored by a separate float switch, the system can continue
running in emergency operation. The activation and deactivation points are defined by
the hysteresis of the float switch.
Installation and operating instructions • Wilo-Control EC-L • Ed.04/2022-09