Crompton Controls DCM - Manual (Page 42)

Emotron AB 01-2120-01r2 Protection and Alarm 41
8 Protection and Alarm
When an error occurs, the triangular alarm sign starts to flash and the alarm
relay is activated.
Window 00 becomes active and gives the information about the alarm accord-
ing to the alarm list, see Table 6, page 43.
Alarm in a dual-pump application
The fault code is shown in window 00 of the respective DCM, the alarm relay is
only set on terminal 6 of the DCM SLAVE when an error occurs. If a latched
alarm occurs it must be reset on the respective DCM by pressing the but-
ton or, if specified as digital input, by an external reset.
8.1 Phase sequence (F1)
When the DCM is first switched on, phases L1, L2 and L3 are checked for cor-
rect phase sequence.
If the wrong phase sequence is detected, an F1 alarm is generated and the
ALARM relay on terminal 6 is activated. The pump will not start. Switch the
power off and shift phase L2 and L3.
8.2 Phase asymmetry (F2)
The permitted phase asymmetry is set in window 41, see Table 8, page 53. Any
failure shorter than 5 seconds is ignored. When phase asymmetry is detected an
F2 alarm is generated and the ALARM relay on terminal 6 is activated. The
pump will be stopped.
If window 42 is set to on, the alarm can be reset by pressing the button or
by using the external reset signal.
NOTE: Do not shift L1, only shift phase L2 and L3.