Name
Content
Current
measurement
AC 0 to 50A
(CT1, CT2)
(50/60Hz)
Voltage
measurement
AC 150 to 600V
(PT1, PT2)
(50/60Hz)
Compressor
Unit with 400V only : 26.0A
overcurrent
Unit with 200V and 400V:
protection
15.0A
Phase sequence The phase sequence is detected
detection
by sending the voltage
waveform to the controller.
4-15
4.2.3 PT and CT board (EC9756)
Two function of the measuring device and
protector are integrated on this printed-circuit
board. This board works as an interface
between the main circuit (high voltage) and the
controller.
(1) Function
(2) Pre-assembly work
Before installing the PT/CT board (spare parts), cut jumpers and remove the mounting plate for the over
current setting.
(2-1) Overcurrent setting
Cut jumpers at section A according to the following chart in order to make the over current setting.
Example: over current setting for 10Hp single power
(2-2) Indication of check marks
After cutting jumpers, indicate check marks on the table B.
Example of check mark
indication
i
Indication label of
applicable model
q
CT1 (total current)
w
CT2 (compressor current)
e
PT2 (S-T voltage)
r
PTI (R-S voltage)
t
Connector (CN2)
for main circuit
y
Connector (CN1)
for controller
u
Mounting hole
(4 places)
Jumpers at section A
(back side)
Jumper check sheet at
section B
Mounting plate
Screws (4 pcs)
A
PT
PT
B
CN2
CN1
CT1
CT2
Table
J3
e
Single 10
J2
w
Dual
5
J1
q
Dual
10
Spare parts
In case of Single 10
Cut the J1, J2
jumper
J3
J2
J1
CASE
Type
Jumper
J1
J2
J3
1
Dual 10
2
Dual 5
3
Single 10
CASE
Check
1
2
3
✔
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