Mitsubishi Electric MES3-255C-DM-EN User Manual page 15

 Terminal block (contact output section)
Terminal
symbol
0 to 9, A to F Contact relay output terminals 0 to 9, A to F
COM Contact relay output common terminal (common for output terminals 0 to 9, A to F)
NC (Unused)
 Terminal block (demand surveillance section)
Terminal
symbol
A+
System alarm output terminal (no-voltage normally-closed contact)
A-
TA
Outside time limit input terminal
TB
RT1
RT2 Pulse input terminal (RT2: positive terminal, RT3: negative terminal)
RT3
E Earth
V1
Power frequency input terminal
V2
NOTE: System alarm output by demand unit terminal is able to output the alarms below.
H/W error, clock error, low battery for clock backup, power frequency out of range error or
external pulse signal error.
Power OFF: output ON, Normal: output OFF, System alarm: output ON
 BAT.SW <battery switch> (demand surveillance section)
 When the demand function is used, turn on this switch to maintain the clock setting, even if
the product is powered off.
* Factory default of BAT.SW is OFF. Please turn it on before demand monitoring.
 TS <time limit synchronization switch> (demand surveillance section)
 Use this switch to synchronize the time limit.
Synchronize the time limit means time adjustment to the transaction electricity meter.
(Note) Press the switch in synchronization with the switching (on the hour or on the
half-hour) of the time limit of the transaction electricity meter.
If the product is located at a distance from the transaction electricity meter:
The time limit can also be synchronized by short-circuiting TA and TB
instead of pressing TS (time limit synchronization switch). Time limit
synchronization can be facilitated by connecting a cable equipped with
a push button to the TA and TB terminals and extending it to near the
transaction electricity meter.
Function
Function
15
TA
TB