And Ct Board (Ec9756) - Daikin LXE10E-A Service Manual

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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
Name
Current
AC 0 to 50A
measurement
(50/60Hz)
(CT1, CT2)
Voltage
AC 150 to 600V
measurement
(50/60Hz)
(PT1, PT2)
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.
(2) Pre-assembly work
Before installing the PT/CT board (spare parts), cut jumpers and remove the mounting plate for the over
current setting.
CN2
PT
PT
CN1
(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.
CASE Type
1 Dual 10
2 Dual 5
3 Single 10
Content
Jumpers at section A
A
(back side)
Jumper check sheet at
section B
B
Table
Mounting plate (Remove LXE10D. 10E)
CT1 CT2
Screws (4 pcs)
Spare parts In case of Single 10
J3 e Single 10
J2 w Dual 5
J1 q Dual
10
Jumper
J1 J2 J3
u Mounting hole
(4 places)
e PT2 (S-T voltage)
i Indication label of
applicable model
J3
Cut the J1, J2
J2
jumper
J1
Example of check mark
indication
CASE Check
1
2
✔
3
4-13
r PTI (R-S voltage)
t Connector (CN2)
for main circuit
w CT2 (compressor current)
q CT1 (total current)
y Connector (CN1)
for controller