2 / 42 CPM-50_V2.30 中文操作手冊 2010-07-03
z Over limit alarming: In CPM-50, when the
metering data is over the pre-setting limit and
over pre-setting time interval, the over limit
alarming will be picked up. The over limit value
and time will be recorded and the maximum
number of records is 9. The digital output (DO)
can be used as trigger to light or sound
alarming. There can be maximum 9 in
equations related to the over limit alarming.
Any satisfaction of the in equations will trigger
the over limit alarming. Any one of the 9
equations can be assigned to one of the digital
output (DO). An example is given in the
following to describe how the first in equation is
being set and determined.
Remark: The related registers should be
pre-set in order to finish the above
process, and the registers are pre-set
through communication.
In equation enable register: register EN_INEQU,
bit0~bit8 corresponding to 1to 9 inequation.
Bit(n)=0 forbid the nth inequation.
Bit(n)=1 enable the nth inequation.
The 9 variables (var1 to var9) can be any of the
34 parameters.
Table 3.1
Number
0
1 2 3 4 5 6 7 8
Parameter F V
1
V
2
V
3
V
lnavg
V
12
V
23
V
31
V
llavg
Number 9 10 11 12 13 14 15 16 17
Parameter I
1
I
2
I
3
I
avg
I
n
P
1
P
2
P
3
P
sum
Number 18 19 20 21 22 23 24 25 26
Parameter Q
1
Q
2
Q
3
Q
sum
S
1
S
2
S
3
S
sum
PF
1
Number 27 28 29 30 31 32 33 34
Bit(n)=0, DO1 do not associate with the nth
inequation
Bit(n)=1, DO1 associate with the nth inequation
Associated DO2 register bit0~bit8 correspond
to the first to ninth inequation.
Bit(n)=0, DO2 do not associate with the nth
inequation
Bit(n)=1, DO2 associate with the nth inequation
¾ Example: If current I
1
goes over the high limit
and time interval limit 15 Seconds, trigger the
over limit alarm record and DO1 output. The CT
ratio of the current I
1
is 200/5. The High limit of
current I
1
is set to be 180A. The setting of the
registers is as following,
Enable the inequation1: EN_INEQU register
bit(0)=1
The current I
1
is number 9 in Table 3.1 The
setting of the Var1 is 9.
The relation of real current and the data stored
in register is,
Real current=(data in registerxCT1/5)/1000
The CT1 is 200 and high limit of current is
180A, then the data in register is 4500. The
setting of the Ref1 is 4500.
Time limit is 15 Seconds and the one digit is
300ms, then the setting of Limit_t1 is 50.
As it is the high limit, the INQU_Sign1 should
be 1.
Use DO1 as alarm signal output, then the bit0
of the associated DO1 should be 1.
Only recent 9 groups of the alarming record can
be stored in memory of CPM-50. The format of
the record is,
Parameter PF
2
PF
3
PF U
unbl
I
unbl
P
d
Q
d
S
d
Address Content Remark
Alarming
record addr.
Alarming parameter
number
Refer to Table3.1
Addr +1 Alarming value
Record the value of alarming
Addr +2 Year Alarming date
Addr +3 Month
Addr +4 Date
Addr +5 Hour Alarming time
Addr +6 Minute
Addr +7 Second
Limit setting register: register Ref1 to Ref9
The setting of the Ref register should be the up
limit or the low limit of the parameter. The range
of the parameter limit is related to the format of
the register.
Time limit setting register: register Limit_t
Limit_t is the time interval limit. It is an integer
from 0 to 255. One digit is 300ms. Zero means
no time limit. Trigger the record and alarming
output immediately on the over limitation. All
the inequations have the same time limit.
If the Limit_t=20,
the time limitation is 20x300=6000ms.
Inequation sign register: INEQU_Sign1 to
INEQU_Sign9.
INEQU_Sign=0, select <, the low limit
INEQU_Sign=1, select >, the up limit
The DO select register:
Associated DO1 register bit0~bit8 correspond
to the first to ninth inequation.
When the alarming parameter resume normal
(no longer over the limit), it is also recorded.
User can get the total period of over limit time.
Remark: when the alarming parameter resume
to normal, the highest bit of Varbit15 is
set to be 1.
z Energy pulse output: The two digital outputs
(DO) can be selected as energy pulse output.
Any two of the 8 Active energy and Reactive
energy can be assigned to be as the pulse
output. The pulse width and pulse ratio can be
set, while pulse width means how long the
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