Grundfos LC 221 Manual De Instrucciones página 6

Functions
The LC 221 controller has the following functions:
• on/off control of two wastewater pumps based on a continuous
signal from a piezoresistive level sensor with alternating
operation and automatic changeover in case of pump failure
• motor protection with motor-protective circuit breaker and/or
current measurement as well as connection of thermal
switches
• motor protection via operating-time limitation with subsequent
emergency operation. Normal operating times are max.
25 seconds (Duolift 270) and 55 seconds (Duolift 540), and the
operating time is limited to three minutes (see section
7.4 Description of fault indications, fault code F011).
• automatic test runs for two seconds during long periods of
inactivity (24 hours after last operation)
• re-starting delay up to 45 seconds after returning from power
cut-off to mains operation (in order to even out the mains load
when several appliances are started up at the same time)
• setting of delay times:
– stopping delay (time from the stop level is reached till the
pump is stopped) - reduces water hammer if pipes are long
– starting delay (time from the start level is reached till the
pump is started)
– alarm delay (time from a fault appears till an alarm is
indicated). This prevents short-time high-level alarm in case
of temporary high inflow to the tank.
• automatic current measurement for alarm indications
• setting of current values:
– overcurrent (preset)
– rated current (preset)
– dry running current (preset).
• operating indication:
– operating mode (auto, manual)
– operating hours
– number of starts
– highest measured motor current.
• alarm indication:
– pump status (running, fault)
– phase sequence failure and missing phase
– thermal-switch failure
– high-water alarm
– service/maintenance (selectable).
• selection of automatic alarm resetting
• fault log of up to 20 alarms
• selection between different start levels
• selection of maintenance interval (0, 3, 6 or 12 months).
As standard, the LC 221 has four potential-free outputs for:
– pump running
– pump failure
– high water level alarm
– common fault.
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Furthermore, LC 221 has inputs for the following functions:
– additional float switch parallel to the existing level sensor
– separate level switch to be used for flood detection outside
the lifting station (e.g. in a sump in the basement)
– external alarm reset
– external alarm
– common fault
– thermal switch of the motor.
For further adjustments, a PC Tool (PC Tool LC22x) can be
connected. See service instructions.
If a warning is required in case of local power supply failure,
a battery (accessory) can be installed which activates an acoustic
alarm (buzzer). The buzzer is activated as long as the fault exists.
It cannot be reset.
If a warning is required in case of sectional power failure,
the common alarm output which is a potential-free changeover
contact can be used to forward the alarm signal to a control room
by means of an external power source.
Double pump operation:
• When the first start level is reached, the first pump will start,
and when the liquid level has been lowered to the stop level,
the pump will be stopped by the controller. If the liquid level
rises up to the second start level, the second pump will also
start, and when the liquid level has been lowered to the stop
level, the pumps will be stopped by the controller.
• Starts alternate between the two pumps.
• In case of pump failure in one pump, the other pump will take
over (automatic pump changeover).
Type key, LC 221 controller
Example
LC 221 = controller type
1 = one-pump controller
2 = two-pump controller
Voltage [V]
1 = single-phase
3 = three-phase
Max. operating current [A]
Capacitors [μF]
Starting method:
[ ] = DOL
SD = Star-delta
LC 221 .2 .230 .1 .10 .30