ABB REC670 Product Manual page 49

ABB
Bay control REC670
Pre-configured
Product version: 1.1
Table 30. Sensitive directional residual overcurrent and power protection SDEPSDE ,
continued
Function
Operate time, non
directional residual over
current
Reset time, non
directional residual over
current
Operate time, start
function
Reset time, start function
Table 31. Thermal overload protection, one time constant LPTTR
Function
Reference current
Start temperature
reference
Operate time:
æ ö
2 2
-
I I
p
t ç ÷
= ×
t ln
ç ÷
2 2
-
I I
è ø
b
(Equation 1)
EQUATION1356 V1 EN
I = actual measured
current
I = load current before
p
overload occurs
I = base current, IBase
b
Alarm temperature
Trip temperature
Reset level temperature
Range or value
60 ms typically at 0 to 2 x I
60 ms typically at 2 to 0 x I
150 ms typically at 0 to 2 x I
50 ms typically at 2 to 0 x I
Range or value
(0-400)% of IBase
(0-400)°C
Time constant t = (0–
1000) minutes
(0-200)°C
(0-400)°C
(0-400)°C
1MRK 511 192-BEN B
Issued: June 2010
Accuracy
-
set
-
set
-
set
-
set
Accuracy
± 1.0% of I
r
± 1.0°C
IEC 60255-8, class 5 + 200 ms
± 2.0% of heat content trip
± 2.0% of heat content trip
± 2.0% of heat content trip
49