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参数资料
| 型号： | LT1701-7DB1 |
| 厂商： | POWER-ONE INC |
| 元件分类： | 电源模块 |
| 英文描述： | 1-OUTPUT 550 W AC-DC REG PWR SUPPLY MODULE |
| 封装： | CASE T01, MODULE |
| 文件页数： | 26/33页 |
| 文件大小： | 838K |
| 代理商： | LT1701-7DB1 |
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T Series
AC-DC Converters >100 Watt
Rugged Environment
Edition 4/4.99
32/33
MELCHER
The Power Partners.
Table 24: Safety concept leading to an SELV circuit
Conditions
AC-DC converter
Installation
Result
Supply voltage
Grade of isolation between input and
Measures to achieve the resulting
Safety status of the AC-DC
output, provided by the AC-DC
safety status of the output circuit
converter ouput circuit
converter
Mains
≤250 V AC
Double or reinforced
Installation according to the appliable
SELV circuit
standards
Fig. 58
Schematic safety concept
Use input fuses and earthing of the AC-DC converter as
per:
Installation Instructions.
AC-DC
con-
verter
Mains
SELV
Earth connection
+
–
10021
Fuse
P
N
P~
N~
Vo+
Vo–
MI for
output
leakage
current
Vo+
Vo–
N
P
10070
N
P
MI for
earth
leakage
current
S1
S2
S3
T 1000
Fig. 56
Test set-up for leakage current tests on class I equipment
in single phase configuration. S1 is used to simulate the
interchanging of phase and neutral, S2/3 select either the
earth or output leakage current measurements, S4 selects
either the positive or negative output leakage current
measurements.
MI for
output
leakage
current
Vo+
Vo–
L1
10071
N
P
MI for
earth
leakage
current
S2
S3
L2
N
L1
L2
LT 1000
Fig. 57
Test set-up for leakage current tests on class I equipment
in 208 V phase to phase configuration. S2/3 select either
the earth or output leakage current measurements, S4
selects either the positive or negative output leakage cur-
rent measurements.
Table 23: Leakage currents
Characteristic
T 1000
Unit
Earth leakage
Permissible according to IEC/EN 60950
3.5
mA
current
Specified value at 255 V, 50 Hz (LT)
1.8 1
Specified value at 127 V, 60 Hz (LT or UT)
1.1 1
Output leakage
Permissible according to IEC/EN 60950
0.25
current
Specified value at 255 V, 50 Hz (LT)
<0.1
Specified value at 127 V, 60 Hz (LT or UT)
<0.1
1 In phase to phase configuration, leakage current is lower.
Safety of operator accessible output circuit
If the output circuit of an AC-DC converter is operator ac-
cessible, it shall be an SELV circuit according to IEC/EN
60950 related safety standards
The following table shows a possible installation configura-
tion, compliance with which causes the output circuit of the
AC-DC converter to be an SELV circuit according to IEC/
EN 60950 up to a configured output voltage (sum of nomi-
nal voltages if in series or +/– configuration) of 56.5 V.
However, it is the sole responsibility of the installer to as-
sure the compliance with the relevant and applicable safety
regulations. More information is given in:
Technical Infor-
mation: Safety.
Protection Degree
IP 30 if female connector is fitted to the unit.
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