K2CU
K2CU
12
K2CU-P Small-capacity, Plug-in Models
Small-capacity
Heater
W
ith External Current T
ransformer
1
2
YBZL
7
8
6
5
4
3
Temperature
sensor
Y/a
Heater
K2CU-P
Temperature
controller
Power
source
Control
contact
7
8
1
2
YBZL
6
5
4
3
Temperature
sensor
Y/a
Heater
K2CU-P
Power
source
CT
jA/5 A
Temperature
controller
Control
contact
Contactor
Note: 1. The
dotted lines which pass through the heater burnout detector indicate the line conductor
passing
through the round “window” of the window-type Current T
ransformer.
2. Y:
External relay for self-holding circuit
BZ:
Alarm buzzer
L:
Alarm indicator
3. To
use an 100 (1
10) V
AC control power supply with K2CU-P
, connect
it to terminal 7 instead
of
6.
Precautions
K2CU-F A- GS
Use
the K2CU-F
jjA-j
GS (with
gate input terminals) in combina
-
tion with a temperature controller that has PID
with feed-forward cir
-
cuitry to control the heater temperature, in which case, the heater
element(s)
must be turned ON or OFF for 0.1 s or longer
.
K2CU-F
When
a single-phase heater is used, pass the two lines through the
openings of the heater burnout detector
. When a three-phase heat
-
er is used, pass two (phases) of the three lines through the
open
-
ings.
In either case, if only one line passes through, an alarm signal
will
always be produced.
With single-phase
power supply
With three-phase
power supply
Heater
Heater
Pass the lines through the
openings only once. If they are passed
more
than once, the actual operating current will be less than the set
current.
The lines can be passed in either direction.
To
use the heater burnout detector at a current less than the current
range
that can be set, the lines must be passed more than once. De
-
termine
the number of
times the lines should be passed by the fol
-
lowing
equation:
(Operating current) x n = Current setting range
where,
n: number of times the lines loop through the window
All
K2CU-F models incorporate a voltage fluctuation compensation
function.
K2CU-P
The
K2CU-P can be used only in single-phase circuits.
Do
not pull out the K2CU-P from the socket when the K2CU-P is en
-
ergized. Especially when using it in combination with a Current
Transformer commercially available, this practice causes the sec-
ondary
circuit of the transformer to open, which is very
dangerous.
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