Accuracy Influencing Factors; Output Contacts; Status Inputs - Siemens 7SG23 MSCDN – MP2A Manual

3.6 Accuracy Influencing Factors

Temperature
Ambient range
Variation over range

3.7 Output Contacts

Output contacts functionality is fully programmable. The basic I/O module has 5 output contacts three of which are
change over. Additional modules can be added with consequential increase in case size, to provide more contacts.
These are added in-groups of eight up to a maximum of 29
3.7.1 Output Contact Performance
Contact rating to IEC 60255-0-2.
Carry continuously
Make and Carry
L/R ≤ 40ms and V ≤ 300 volts)
(limit
for 0.5 sec
for 0.2 sec
Break
≤ 5A or ≤ 300 volts)
(limit
Ac resistive
Ac inductive
Dc resistive
Dc inductive
Minimum number of operations
Minimum recommended load

3.8 Status inputs

Status Inputs functionality is fully programmable. The basic I/O module has 3 status inputs, additional modules can
be added to provide more inputs, these inputs are added in-groups of eight up to a maximum of 27. A pickup timer is
associated with each input and each input may be individually inverted where necessary. The pickup timer may be
used to provide rejection at power system frequency.
Nominal Voltage
30 / 34
48 / 54
110 / 125
220 / 250
NB: the status input operating voltage does not have to be the same as the power supply voltage.
3.8.1 Status Input Performance
Minimum DC current for operation
Reset/Operate Voltage Ratio
Typical response time
Typical response time when programmed to energise an
output relay contact
Minimum pulse duration
To meet the requirements of ESI 48-4 then 48V status inputs should be ordered together with external dropper
resistors as follows:-
Status Input External Dropper Resistances
Nominal Voltage
110 / 125V
©2011 Siemens Protection Devices Limited
5A ac or dc
MSCDN – MP2A Performance Specification
-10°C to +55°C
≤ 5%
20A ac or dc
30A ac or dc
1250VA
250VA @ PF ≤ 0.4
75W
30W @ L/R ≤ 40 ms
50W @ L/R ≤ 10 ms
1000 at maximum load
0.5W, limits 10mA or 5V
Operating Range
18V to 37.5V
37.5V to 60V
87.5V to 137.5V
175 to 280V
48V 10mA
110V 2.25mA
220V 2.16mA
≥ 90%
< 5ms
< 15ms
40ms
Resistor Value (Wattage)
2k7 ± 5% ; (2.5W)
Chapter 2 Page 6 of 13