Emerson 48330 Functions fulfilled by SCU and MC, Alarm category settings for dry contact output

8 Chapter 1 System Description

When SCU communicates with MC through MODEM or ES-MOD, it uses PSTN to realize long-distance monitoring. Power supply cables and communication cables shall be prepared for the communication through MODEM.

3. Dry Contacts Output

SCU has 8 dry-contact outputs. Every dry-contact output has NC (normally closed) and NO (normally-open) contacts. Every dry-contact output shall be configured before the alarm event occurs. Different dry-contact output can trigger different alarms. Once the alarm event occurs, the dry-contact will close or open to generate the alarm.

If the user has other intelligent equipment to be monitored by SCU, the user can connect the dry contacts to the interface of the intelligent equipment, and control the intelligent equipment through these dry contacts.

Capacity of dry contacts: 2A@30Vdc; 05A@125Vac;

Maximum power dissipation: 60W

Functions fulfilled by SCU and MC

In RS232 and MODEM communication modes, the MC can fulfill the following functions through SCU:

1.Remote acquisition of analog and digital values: MC can acquire the real-time analog and digital values of DC Power System through SCU;

2.Remote control functions: MC can shut down the rectifiers, change the boost charge status to float charge status (or in reverse), silence the alarm and stop/start the battery test through SCU.

Alarm category settings for dry contact output

1.Through setting the parameter of “Relate Relay”, the user can configure the alarm category for every dry-contact output. Every dry-contact output has been configured to correspond to an alarm category before SCU is delivered to customer.

2.SCU has PLC functions in the alarm management. The PLC is to realize simple logic operation, i.e. the "And", "Or" and "Not" operations. The PLC inputs are all the possible alarm signals, and the PLC outputs can be used to select one of the 8 dry contacts. The alarm categories can be configured flexibly for every dry-contact output through MC. The PLC settings for every dry-contact have three alarm inputs, and two relation flag. The SN of three alarm categories and the mutual logic relationships need to be configured.

PLC can be set to “Disabled”. If PLC functions and alarm co-relation are enabled at the same time, the dry contact will act to activate an alarm when any alarm event occurs.

ACTURA Flex 48330 Power System User Manual