Crompton Controls DCM - Manual (Page 29)

28 Single-Pump System Installation Emotron AB 01-2120-01r2
6.1 Single-pump system connection
6.1.1 Supply voltage connection (L1, L2 & L3)
Connect the Emotron DCM (3-phase installation only) directly to the pump
motor supply cable via terminals 9 (L1), 11 (L2), and 13 (L3). Make the con-
nection ahead of the contactor of the motor, to ensure that the DCM also
receives power when the motor is not in use. When motor fuses larger than
10 A are used, the DCM (power consumption 6 VA) must be fused independ-
ently, see Fig. 13, page 27.
6.1.2 Current transformer connection (S1 & S2)
Connect the current transformer CTM xxx to terminal 1 (S1, blue wire) and
terminal 2 (S2, brown wire). The transformer MUST be linked to the phase
connected to terminal 9 (L1), see Fig. 13.
When two current transformers are used (for motors with a rated current greater
than 100 A), always connect the CTM010 to the DCM and one outer standard
current transformer with 2 primary windings through the CTM010, see Fig. 8
and 13 and Table 2, page 17.
In order to ensure accurate calibration of the Emotron DCM, it is essential that
you use the correct CTM and apply the exact number of windings in accord-
ance with Table 1, page 15 or Table 2, page 17.
6.1.3 Alarm relay connection (ALARM & C)
Terminals 6 and 7 are the alarm relay connections. Terminal 6 (ALARM) is the
alarm relay output. Terminal 7 (C) is the common input for the alarm relay.
When powered off, the alarm relay is NC (normally closed). When powered on,
NC or NO (normally open) can be selected, see Table 8, window 51.
NOTE: Before connecting the current transformer(s), study the choice of
current transformers carefully to determine the correct number of
windings. The current transformer MUST be linked to the phase connected
to terminal 9 (L1), see Fig. 13, page 27.