Network Transducer; Management Of Dual Supply - Mitsubishi Electric s-MEXT-G00 006 Technical Manual

TM_s-MEXT_ME28relC_00_12_19_EN
13

NETWORK TRANSDUCER

A Gavazzi model CPT-DIN.AV5.3.H.S1.AX network transducer is used to measure the main electrical variables.
The converter is connected to the controller via the RS485 port (fieldbus2) using the Modbus protocol.
the communication parameters are:
▪ Baud rate 19200
▪ No parity
8 data bits
▪
▪ 1 stop bit
Communication with the transducer can be enabled using the "Optional" menu, which can be accessed by entering the "Service" password.
The system type (single-phase, three-phase) and the transformation ratio of the current transformers connected between the power supply and the transducer can be set in
the "Optional" menu, which can be accessed by entering the "Service" password. It is also possible to configure the Modbus network between the transducer and the
controller (transducer baud rate change from 4800 to 19200).
The mask displays information on the status of the parameters in the network transducer. If the configuration is successful "Programming OK (Esc)" is displayed, otherwise
"Check Connections (Esc)" appears.
Transducer mng
Config CPT network: Y
Serial baud CPT:9600
0:NO ERROR
0:NO ERROR
Programming ...
If configuration is performed correctly, the masks for displaying the electrical measurements made by the network transducer are enabled in the main menu. The displayed
variables are:
•
Phase to phase voltage, only for three-phase units.
•
Phase voltage (phase-neutral).
•
Phase current.
•
Neutral current only for three-phase units.
•
Active phase power, only for three-phase units.
•
Total active power.
•
Active energy.
•
Hour counts.
The power counter and hour counter are reset from the "Manual" menu, which can be accessed by entering the "Service" password.
The "Manual" menu can also be used to reconfigure the transducer if, for example, it is replaced.
If the transducer does not communicate with the controller due to a broken cable or communication errors, an offline signal appears (Automatic reset).
14

MANAGEMENT OF DUAL SUPPLY

Units with management of dual supply with ATS (Automatic Transfer Switch) can be combined with a buffer battery module that keeps the controller powered during
automatic switch-over from one supply to the other.
The logic constantly monitors the supply of power between the G and G0 terminals of the controller, and the state of the contact of the phase sequence relay.
When there is a mains power cut, the logic of the controller remains active because the buffer battery supplies power to the controller.
At this point, the logic implements the following steps:
•
The unit is turned OFF due to an alarm.
•
All the digital inputs are bypassed (except ID1 that detects the presence of power).
•
The alarms of the inverter (when applicable) are bypassed.
• The safety times of the compressors are reset.
•
The alarm log and the BBX are bypassed.
These steps are carried out to then allow the unit to restart as soon as the mains power supply returns.
When the mains power supply returns, the controller is powered again between terminals G and G0, and the unit turns ON again, ready to continue normal operation.
To do this, the logic does the following:
•
Turns ON the unit.
•
Activates reading of the status of the digital inputs.
•
Activates management of inverter alarms.
•
Activates management of the alarm log and BBX.
•
Resets all the alarms 5 seconds after the power supply is restored.
•
The unit runs again according to the normal adjustment logic.
The icon on the main mask indicates activation of dual supply.
Technical manual
Transducer mng
Config CPT network: Y
Serial baud CPT:19200
0:NO ERROR
0:NO ERROR
Transducer OK
CT Ratio OK System
OK
Programming OK (Esc)
96
Transducer mng
Config CPT network: N
Serial baud CPT:9600
-3:INVALID DATA
-3:INVALID DATA
Check Connections (Esc)
TRANSLATION OF THE ORIGINAL INSTRUCTIONS