Crompton Controls DCM - Manual (Page 38)

Emotron AB 01-2120-01r2 Dual-Pump System Installation 37
7.1.3 Dual-pump alarm relay connection (ALARM & C)
Terminals 6 and 7 on the DCM SLAVE are the alarm relay connections. These
terminals indicate an alarm if a fault is detected by the DCM MASTER or the
DCM SLAVE. See Fig. 16. When powered off, the alarm relay is NC (normally
closed). When powered on, NC or NO (normally open) can be selected. See
Table 8, page 53, window 51.
7.1.4 Dual-pump communication and digital input
connection (DIG & SGND)
Terminals 3 (DIG) and 4 (SGND) are connections for closing contacts and for
communicating between the DCM MASTER and the DCM SLAVE. The dig-
ital input can be used for high-level switch or external reset. The high-level
switch must be connected in series with the DCM MASTER terminal 6
(ALARM) and terminal 3 (C). When external reset is chosen use the pulse sig-
nal. Connect terminal 3 (DIG) on the DCM MASTER to terminal 3 (DIG) on
the DCM SLAVE. Connect terminal 4 (SGND) on the DCM MASTER to ter-
minal 4 (SGND) on the DCM SLAVE. See Fig. 16 and Table 8, page 53, win-
dow 53.
7.1.5 Dual-pump operation relay connection (PUMP)
Connect the control signals for the start and stop equipment for each pump to
the respective DCM as described in Section 6.1.4, page 29. See Fig. 16.
7.1.6 Dual-pump temperature-measuring input
connection (TEMP & SGND)
Connect the temperature sensor and/or motor protection for each pump to the
respective DCM as described in Section 6.1.6. See Fig. 16.