1
Motor Protector Series Operating Instruction
(V1.0)
（
NA704L
、
NA708L
、
NA712L
）
Main Functions
Current display:
display three average current, press key to display A
、
B
、
C phase current
respectively.
Underload protecting:
when three phase average current lower then setting current, circuit
protects and load opens.
Overload protecting:
when three phase average current exceed rated current, circuit protects and
load opens.
Deficient-phase protecting:
w
hen testing deficient-phase or three phase current unbalance, circuit
protects and load opens.
Auto reset:
when circuit protects and load opens, can set “reset automatically” degree and time,
after some time, switch on load again, if circuit still has malfunction, try several times, then must reset
manually.
¤
Main Technique Index
Current display range:
0
～
50A (NA704L),0
～
100A (NA708L),
0
～
120A (NA712L),precision ±2%
Rating current range:
Sort
Min(A)
Max(A)
NA704L
1.0
40.0
NA708L
2
80
NA712L
2
120
Underload protect action time:
0.5
～
30s (adjustable)
Overload protect action time:
0.5
～
30s (adjustable)
deficient-phase protect action time:
0.5
～
30s (adjustable)
Power supply:
AC 220V±10%
）
Operating environment:
temperature -10
℃～
45
℃，
humidity
≤85%
.
Relay contact capability:
2A/250VAC (pure resistive load)
Executive standard:
Q/320585 XYK 03
Operating Guide
The meaning of the LED
：
LED
light
flash
phase A
Display the current of phase A
-
A
、
B
、
C LED no light means
display three phase average
current
phase B
Display the current of phase B
-
phase C
Display the current of phase C
-
Alarm
Circuit protecting, Load
opens
Circuit protects ever, but
already reset automatically
The meaning of the nixietube display
：
In normal, controller displays three phase average current(unit: A), press “SEL
（
）
”, then display
A
、
B
、
C phase current respectively. In the alarm state, it displays alarm code.
Alarm codes:
Code
Meaning
Explanation
OL.
overflow
Current exceed measure range
（
NA704L measure range 50A
，
NA708L measure range 100A, NA712L measure range 140A
）
LAC
underload
Load current lower than setting current
OVL
overload
Load current exceed rated current
PHA
deficient-phase
Deficient-phase or three phase current unbalance
How to display A
、
B
、
C phase current?
Press “SEL
（
）
”then display A
、
B
、
C phase current respectively, the correspond LED lights. If
A
、
B
、
C three LED is unlighted, mean that controller display three average current.
How to reset from the alarm state?
When overload or deficient-phase protection occurs, alarm LED lights, and protection circuit
activates, the load opens, finally the state of open locks. You can set “reset automatically” degree and time,
after some time, switch on load again, if circuit still has malfunction, try several times, then must reset
manually. In any time, if press “RST
（
）
”, reset from the alarm state.
How to set the parameter?
