Programming And Monitoring Functions - TDK-Lambda HFE2500 Series Instruction Manual

4.5 PROGRAMMING AND MONITORING FUNCTIONS

For Monitoring and Programming functions use the following equation. This is the direct data format.
R
Y = (mX + b )* 10
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 Table 1.
Voltage (V) Physical value
48 Voltage Programming
Voltage monitoring
Current monitoring
Temperature monitoring
32 Voltage Programming
Voltage monitoring
Current monitoring
Temperature monitoring
24 Voltage Programming
Voltage monitoring
Current monitoring
Temperature monitoring
12 Voltage Programming
Voltage monitoring
Current monitoring
Temperature monitoring
12, 24, 32, 48 Current monitoring
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
4.5.1 MONITORING THE 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 1 for the Coefficients for calculating the Output Voltage.
Command code
Example: Power Supply HFE2500-48;
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 ORing 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%
- R
X = (Y*10 - b )/m
Physical Unit
V
V
A
°C
V
V
A
°C
V
V
A
°C
V
V
A
°C
%
Command code
D2h
D3h
D4h
D5h
D7h
8Bh Read Word
Supply (*1)
HFE2500-12
HFE2500-24
HFE2500-32
HFE2500-48
Min. Value Max. Value
38.4 58
0 60
0 60
0 100
28.8 38.4
0 40
0 90
0 100
19.2 29
0 30
0 120
0 100
9.6 13.2
0 15
0 240
0 100
50 110
Type
Read Block
Read Block
Read Block
Read Block
Read Block
Type #Data bytes
Full Scale (*1)
15V
30V
40V
60V
17
Table 1
m b R
426 -15335 -1
1705 0 -2
1705 0 -2
1023 0 -2
639 -15333 -1
25575 0 -3
11366 0 -3
1023 0 -2
853 -15360 -1
341 0 -1
8525 0 -3
1023 0 -2
1705 -15345 -1
682 0 -1
4263 0 -3
1023 0 -2
146 -5830 -1
#Data bytes
16
16
16
17
16
2