Crompton Controls DCM - Manual (Page 43)

42 Protection and Alarm Emotron AB 01-2120-01r2
8.3 Checking the current (F3)
When is pressed the DCM checks the measured current from the current
transformer (CTM), see Table 1, page 15 or 2, page 17.
The measured current at terminals S1 and S2 is displayed in window 61. If the
measured current is below 10 mA or above 60 mA, an F3 alarm is generated and
the alarm relay is activated. The pump will be stopped.
8.4 Operating fault (F4)
If the pump is snoring and the high-level switch gives the signal to pump, this is
a fault situation and an F4 alarm is generated and the ALARM relay is activated.
If communication between the DCM MASTER and the DCM SLAVE is inter-
rupted an F4 alarm is generated and the ALARM relay is activated. See Fig. 16,
page 36 and Section 7.1.4, page 37.
8.5 Temperature input (F5)
Temperature monitoring on pump motor
The Emotron DCM can use either an input thermistor (PTC) signal or thermo
contact (terminal 5). To activate temperature monitoring, set window 31 to
“on”.
When the pump motor gets hot, the excess temperature generates an F5 alarm
and activates the ALARM relay and the pump will be stopped.
It is also possible to connect a motor protection relay to generate an F5 alarm.
See Fig. 13, page 27 and Fig. 16, page 36.
If window 32 is set to on, the alarm can be reset by pressing the RESET button
or by using the external reset signal.
8.6 Undervoltage (LU)/Overvoltage (OU) alarm
When the Emotron DCM is first switched on, the voltages on phases L1, L2
and L3 are checked.
If the wrong phase voltage is detected, an LU (undervoltage) or OU (overvolt-
age) alarm is generated and the ALARM relay is activated. The pump will not
start. Switch the power off. Check that the line voltage corresponds to the volt-
age range of the DCM according to the rating plate on the side of the unit.
SET
AUTO
SET
AUTO