SanRex CALPOTE UG Series, Instruction Manual

Page: 14 / 97

14
5 EXTERNAL CONNECTIONS OF THE UNIT
5.1 Control Terminal Block
Wire the control terminal block of the unit according to the following table. (Terminal screw: M3)
Terminal Description about functions and purposes When not in use
200
0
The inputs for the control power supply. These terminals need
to be wired according to the main circuit polarity.
Models with a rated current of 25 to 75 A: 25 VA, models with
a rated current of 100 to 450 A: 50 VA
–
1A
1C
External warning relay (1) output signal
The contact is closed when an error occurs. normally open ,
250 VAC and 1 A, 30 VDC and 1 A
Open
HA
HC
External warning relay (2) output signal
The contact is closed when an error occurs. normally open ,
250 VAC and 1 A, 30 VDC and 1 A
Open
+
S
–
Temperature control signal input
Connect (+) of temperature controller to (+) terminal and (-) of
temperature controller to (-) terminal.
Short-circuit “+” with “S” when the temperature controller is
a current source. 4 to 20 mA (DC)
Open “S” when the temperature controller is a voltage source.
0 to 5 VDC
Open
PS Temperature control signal output
This terminal is used when a single temperature controller
controls multiple units.
You can also control multiple units by connecting a temperature
controller in parallel with them, instead of using PS.
PS
terminal
Advantage Disadvantage
When
used
Control accuracy can
be retained even
when the number of
units connected in
parallel increases.
When the power supply to
one unit is interrupted, the
subsequent units also stop.
When
not
used
Even when the power
supply to one unit is
interrupted, the other
units can continue to
be operated.
When the number of units
connected in parallel increases,
the temperature controller
signal level lowers, decreasing
the control accuracy.
Open