Programming And Monitoring Functions; Monitoring Output Voltage (Read_Vout) - Tdk-Lambda Rfe2500 Serie Bedienungsanleitung

5.3

Programming and Monitoring Functions

���� = ( �������� + ���� ) ∗ 10
For Monitoring and Programming functions use the following equation. This is the direct data format.
Where Y - digital value sent or received from the supply.
X is the normal value (V, A, °C)
m, b, R - coefficients that are explained in
Voltage (V) Physical value
Voltage Programming
Voltage monitoring
48
Current monitoring
Temperature monitoring
Voltage Programming
Voltage monitoring
24
Current monitoring
Temperature monitoring
Voltage Programming
Voltage monitoring
12
Current monitoring
Temperature monitoring
12,24,32,48 Current Programming
m, b, R coefficients can also be recovered from the EEPROM.
Coefficients are stored in ASCII Format.
Command Name
MFR_VOLTAGE_MON_COEFF
MFR_CURRENT_MON _COEFF
MFR_TEMP_MON_COEFF
MFR_VOLTAGE PROG_COEFF
MFR_CURRENT_ PROG_COEFF
5.3.1

Monitoring Output Voltage (READ_VOUT)

The accuracy of the voltage reading is +/-2%
The output voltage is read before the ORING Circuit (~50mV Voltage drop @ load, no drop @no load).
The read back Output Voltage can be calculated using the "Direct data Format".
Refer to Table 5-1 for the Coefficients for calculating the Output Voltage.
Command Code
8Bh
Example: Power Supply RFE2500-48;
Hex read back = 032Ch;
Converted to Decimal = 812;
Using the required coefficients the Output Voltage 812x100/1705 = 47.62V.
Read the Actual Output Voltage on the Output Bus Bar (Ex: 47.90V). Add 0.05V to compensate O-Ring
Circuit drop.
So, the actual voltage is (Ex: 47.90 + 0.05 = 47.95V).
Accuracy is (47.95-47.62)/60(*1) x100 = 0.55%
Supply (*1)
RFE2500-12
RFE2500-24
RFE2500-48
���� =
�����∗10 −�����
−����
����
����
,
Physical Unit Min. Value
V
V
℃
A
V
V
℃
A
V
V
℃
A
%
Table 5-1: Coefficients Table
Command Code
D2h
D3h
D4h
D5h
D7h
.
Table 5-1
Max. Value
38.4 58
0 60
0 40
0 100
19.2 29
0 30
0 80
0 100
9.6 13.2
0 15
0 160
0 100
50 110
Type
Read Block
Read Block
Read Block
Read Block
Read Block
Type
Read Word
22
m b
426 -15335
1705 0
25575 0
1023 0
853 -15360
341 0
12787 0
1023 0
1705 -15345
682 0
6394 0
1023 0
146 -5830
#Data Bytes
16
16
16
17
16
#Data Bytes
2
Full Scale (*1)
15V
30V
60V
R
-1
-2
-3
-2
-1
-1
-3
-2
-1
-1
-3
-2
-1