CET Electric Technology
93
2)
The default Ullnominal
= 120V for 69V/120V Input;
= 415V for 240V/415V Input;
= 690V for 400V/690V Input.
3)
The last Octet of the
IP Address, Subnet Mask
and
Gateway
can neither be “0000 0000” nor “1111 1111”.
If the IP Address is “192.168.8.97”, write “0xC0A80861” to this register. The default values for the
IP Address, Subnet Mask
and
Gateway Address
are 192.168.0.100, 255.255.255.0 and 192.168.0.1, respectively.
4)
PF
Convention (-IEEE is the same as IEEE but with the opposite sign):
Figure 5-1 PF Convention
5)
There
are two methods to calculate kVA:
Vector: kVA
total
=
√
kW
total
2
+kVar
total
2
Scalar: kVA
total
=kVA
a
+kVA
b
+kVA
c
6)
The
Predicated Response
setup parameter allows the user to adjust the sensitivity of the predicted demand output. A value between
70 and 99 is recommended for a reasonably fast response. Specify a higher value for higher sensitivity.
7)
Only one DI should be programmed as a Demand Sync Input and the last one that is set to Demand Sync Input is valid. For example,
DI2, DI3 and DI5 are all set to Demand Sync Input, but only DI5 control the Demand Sync.
8)
Only DI6 can be used as an external time synchronization (PPS) input.
9)
The 3 Digital Inputs (DI1, DI2 and DI3) represent 3 binary digits where Tariff 1=000, Tariff 2=001, Tariff 3= 010, …Tariff 7=110 and Tariff
8=111 where DI1 represents the least significant digit and DI3 represents the most significant digit. As soon as DI1, DI2 and/or DI3 are
configured as
Tariff Switches
, the current
TOU Tariff
will be determined by the status of the DIs, and the TOU Schedule will be ignored.
The
DI1 Function
setup register must first be programmed as a
Tariff Switch
before configuring DI2 and DI3 with the same function.
In other words, if DI1 is configured as a
Digital Input
or
Energy Pulse Counter
, and DI2 is configured as a
Tariff Switch
, the TOU will
continue to function based on the TOU Schedule. The number of Tariffs supported depends on how many DIs are programmed as a
Tariff Switch as indicated in the following table.
Tariff
DI Function
DI1 = Tariff Switch
DI2 & DI1 = Tariff Switch
DI3, DI2 & DI1 = Tariff Switch
T1
DI1 (0=T1)
DI2 + DI1 (00=T1)
DI3 + DI2 + DI1 (000=T1)
T2
DI1 (1=T2)
DI2 + DI1 (01=T2)
DI3 + DI2 + DI1 (001=T2)
T3
Not Available
DI2 + DI1 (10=T3)
DI3 + DI2 + DI1 (010=T3)
T4
Not Available
DI2 + DI1 (11=T4)
DI3 + DI2 + DI1 (011=T4)
T5
Not Available
Not Available
DI3 + DI2 + DI1 (100=T5)
T6
Not Available
Not Available
DI3 + DI2 + DI1 (101=T6)
T7
Not Available
Not Available
DI3 + DI2 + DI1 (110=T7)
T8
Not Available
Not Available
DI3 + DI2 + DI1 (111=T8)
Table 5-36 DIs and the Number of Tariffs Setup
10)
The
AI Type
,
AI Full Scale
,
AI Zero Scale
registers are valid only when the meter is equipped with corresponding AI module.
11)
There are two methods to calculate THD:
THDf:
THD
f
=
√∑
I
n
2
∞
n=2
I
1
×100%
where I
1
represents the RMS value of the fundamental component, and I
n
represents the RMS value for the n
th
harmonic with n for
harmonic order.
THDr:
THDr
=
√∑
I
n
2
∞
n=2
√∑
I
n
2
∞
n=1
×100%
where I
n
represents the RMS value for the n
th
harmonic with n for harmonic order.
