Emerson ACTURA Flex 48330 User Manual page 18

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