①、
block protection
：
When working current reaches to from 4 times to 8 times of set current after finish
starting, response time
≤
0.2s
；
②、
Short circuit protection: when testing current reaches above 8 times of set current, response time
≤
0.2s
；
③、
Protection of phase failure: in case of phase failure of any one phase,
operation time equals
setup time
；
④、
Unbalance protection: when currents of any two phase differ 60
～
75%,
operation time equals
set time
；
⑤、
Protection characteristics of reverse time limit of overload (time unit: second)
，
please see following
table
（
table 2.1.1
），
multiple
＝
Iactual
／
Iset
motor operates with delay time according to overload factors and operation time shown in following table
(table 2.1.1) when motor’s working current is larger or equal to from 1.2 times and 3.0 times of set
current.
I
actual
/
I
set
Time parameters
≥
1.2
≥1.3
≥1.5
≥1.6
≥2.0
≥3.0
Operation time
（
S
）
60
48
24
8
5
1
Table 2.1.1 curve table of reverse time limit for protection of motor
8、
Temperature protection: when actual temperature measured is larger than temperature set; response time
≤
2s
；
9、
Contact capacity of output relay: 250V,5A
；
Contact endurance 500000 times
10、
Error of displayed current is less than 1.0%.
；
11、
RS485 communication
3
、
Type and specification
1、 Instruction of type
2、Specification table for power of suited motor
MAM 880
（
B
）
（
T
）
（
V
）
（
40
）
Maximum working current matching
with host motor
With voltage detection
With RS485 communication
B: pressure sensor; K: Pressure switch
880 controller
Serial
