Installation and Operating Instructions

10000
1000
100
10
1
0.1 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0
Y
Class 5
Class 10
Class 20
Class 30
CCP + Class 20
X
TM072272
Pos. Description
Y Trip time [s]
X Current [A]
Full-load current is set to 10 [A] and trip class 20 is
selected.
• Motor overload. When the motor is overloaded
with 15 [A], it will take ~800 seconds to trip the
motor protection when trip class 20 is selected.
• The pump is blocked. If the pump is blocked and
the motor has a locked rotor current specified to
65 [A], it will take approximately 1 second to trip
the motor protection due to the contactor-current
protection.
The contactor is worn out
LC 231 has a wear-out counter for the contactor(s)
which are based on the actual current when switching
off the motor.
When 90 % of the estimated wear-out for the
contactor is reached, the warning code 220 appears
on the operating panel. In Grundfos GO Remote, the
warning Contactor wear out appears.
When 100 % of the estimated wear-out for the
contactor is reached, the alarm code 220 Contactor
wear out appears on the operating panel and the
controller will not be able to start the pumps.
The pump is blocked
To prevent that the contactor gets worn out too fast if
the pump is blocked, a maximum number of restarts
areallowed by the controller. Maximum number of
blocked motor restart can be set from 1 to 3 via
Grundfos GO Remote. Tripped by the CCP-curve.
The alarm code 51 Blocked appears on the
operating panel. In Grundfos GORemote, the
alarm Blocked appears.
If the motor has reachedthe maximum numbers of
restarts, 1 to 3 times, due to a blocked motor, it is
possible to reset the failure up to 3 times manually.
After that LC 231 will wait 24 hours before trying to
restart the motor again. Alternatively, switch off the
main power supply to LC 231 for a minimum of 30
seconds to clear the alarms.
A blockage alarm is typically triggered when the
motor starts and in-rushcurrent trips the motor. The
maximum allowed blockage situations are limited to 6
times during a 24-hour period. If the Maximum
number of blocked motor restart is set to 3, the
control unit tries to restart the motor 3 times before a
manual reset is needed. If it occurs 3 times again
after the reset, the control unit has reached the
maximum number of blockages.
Related information
6.15.4 Setting the motor protection with Grundfos
GO Remote
6.16 Alarm reset
6.16.1 Resetting alarms and warnings manually
with Grundfos GO Remote
1. Go to Alarms and warnings.
2. Press Reset alarm.
All current alarms and warnings have been reset.
However, if the fault causing the alarm or
warning has not been removed, the alarm or
warning will appear again.
3. If you want to delete all alarms and warnings
from the history log, press Show log > Reset
alarm and warning logs.
6.16.2 Setting the automatic alarm reset with
Grundfos GO Remote
1. Go to Settings > Automatic alarm reset.
2. Select one of the following:
Option
Description
No automatic
reset
The control unit does not
reset any alarm or warning.
You must do it manually.
All except
pump critical
The control unit resets alarms
and warnings unless the
related fault can damage the
pump.
All alarms The control unit resets alarms
and warnings, regardless of
the fault.
6.16.3 Resetting alarms and warnings on the
operating panel
You can manually reset alarms and warnings on the
operating panel. However, if the fault causing the
alarm or warning has not been removed, the alarm or
warning will appear again.
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English (GB)