User guide

UG_6613_ 040 6613_PSU_1+1S_URT_V1_00 Firmware Description Document
Rev. 1.0 23
8 Configuration Parameter Entry
8.1 MPU Parameters
Table 3 lists the MPU parameters configurable by the 6613_PSU_1+1S_URT_v1_00 Firmware.
Table 3: MPU Parameters
MPU
Parameter
Location
(hex)
LSB Default Comment Example
VMAX A A0 mVrms +471.500
External rms voltage
corresponding to 250 mVpk at the
VA input of the 78M6613. It must
be set high enough to account for
overvoltages. Usually set to
471.500 V (471.500d).
If only using a 120V
system, the user can set
VMAX A to about 2x the
maximum voltage for added
resolution. Set VMAX A to
270V:
)A0=+270.000<CR>
Starting IA A1 mArms +0.007
Minimum current value to be
measured on the IA input.
Currents below this value will be
ignored. Also known as CREEP
IA.
Default setting is 7 mA. If
start current on channel A
desired is 10 mA:
)A1=+0.010<CR>
IMAX A A2 mArms +52.000
External rms current
corresponding to 250 mVpk at the
IA input of the 78M6613.
The default is set to 52
Amps for overhead. For
added margin, in a system
using current shunts IMAX
could be changed as
follows:
IMAX= (Vpk/√2)/R
shunt
For a 4 mΩ current shunt
IMAX=44.19 Amps
To set IMAX A:
)A2=+44.190<CR>
Unused A3 - A5 – – Unused
Temperature
Nominal
A6 – +0
Temp_raw_x reading at 22 °C.
Needed to enable temperature
compensation.
Temp _raw_x is obtained
from the CE:
]71?<CR>
This value is then entered
here:
)A6=+value in decimal
Also, the command:
>CLT<CR>
Will do the same as the
steps above.
Reserved A7 – – Reserved
PPMC A8 ppm/°C -668 ppm per °C.
Do not change the default
setting.
PPMC
2
A9
ppm/°C
2
-341
ADC temperature compensation
ppm per °C
2
.
Do not change the default
setting.