71M6511-IGT TERIDIAN [Teridian Semiconductor Corporation], 71M6511-IGT Datasheet - Page 72

• Manufacturer Part Number: 71M6511-IGT
• Description: Single-Phase Energy Meter IC
• Manufacturer: TERIDIAN [Teridian Semiconductor Corporation]

Current Shunt Variables
Input variables: IA_SHUNT and IB_SHUNT can configure the current inputs to accept shunt resistor sensors. In this case the
CE provides an additional gain of 8 to the current inputs. This will enable the pulse rate to change by 8 times. In order to
maintain a normal pulse rate WRATE may have to be decreased by 8 times. Whenever IA_SHUNT or IB_SHUNT are set to 1
or a positive number, In_8 is assigned a value of 8 in the equation for Kh.
CE Calibration Parameters
The table below lists the parameters that are typically entered to affect calibration of meter accuracy.
Page: 72 of 95
Address
Address
CE
2A
2B
2C
CE
10
A
B
C
D
E
8
9
F
RESERVED
RESERVED
RESERVED
RESERVED
PHADJ_A
PHADJ_B
RESERVED
CAL_VA
IA_SHUNT
IB_SHUNT
CAL_IA
CAL_IB
Name
Name
Default
16384
16384
16384
Default
0
0
0
© 2005-2007 TERIDIAN Semiconductor Corporation
-1
-1
Description
These constants control the gain of their respective channels. The nominal
value for each parameters is 2
proportional to its CAL parameter. Thus, if the gain of a channel is 1% slow,
CAL should be scaled by 1/(1 – 0.01).
These two constants control the CT phase compensation. No compensation
occurs when PHADJ_X = 0. As PHADJ_X is increased, more compensation
(lag) is introduced. Range: ±2
angle Φ:
b
c
PHADJ
a
Description
When +1, these variables increase the respective current gain by 8. The
gain factor controlled by In_SHUNT is referred to as In_8 throughout this
document. Allowed values are 1 or –1. For example, if IB_SHUNT=-1, IB_8
= 1, if IB_SHUNT = 1, IB_8 = 8.
IA_SHUNT corresponds to IA_8, IB_SHUNT corresponds to IB_8.
=
=
=
1
1
1 (
−
+
−
1 (
1 (
_
2
−
−
−
X
9
2
2
)
=
sin(
−
−
9
9
2
)
)
20
2
cos(
2
−
b
π
Single-Phase Energy Meter IC
2
F
a
−
2
1 (
0
⋅
c
T
π
TAN
⋅
−
F
)
TAN
0
2
T
Φ
−
15
14
)
9
Φ
71M6511/71M6511H
)
– 1. If it is desired to delay the current by the
= 16384. The gain of each channel is directly
cos(
DATA SHEET
2
π
F
0
T
)
AUGUST 2007
F
0
T
=
F
F
0
S
V2.6