ADTEK ST-LC, Operation Manual

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ST-LC OPERATION MANUAL(EN) 2011-04-27
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■
Reading stable functions
■
Relay Functions
„
Average Display update
[
avg
]
Settable range: 1~99 times;
Jittery Display caused by the noise or unstable
signal. User can set the times to average the readings,
and to get smoothly display.
Remark: To set the average times with higher will make
the response time slower of Relay and
Analogue output.
The meter’s sampling is 15cycle/sec
If the
[
avg
]
(Average) set to be 3 to express the
display update with 5 times/sec.
The meter will calculate the sampling 1-3 and update
the display value. At meantime, the sampling 4-6 will be
processed to calculate.
Average set to be 3
…….
Sample 1 Sample 2 Sample 3 Sample 4 Sample 5 Sample 6
…….
Display Update Value =
(Sample 1 + Sample 2 + Sample 3)/3 Display Update Value =
(Sample 4 + Sample 5 + Sample 6)/3
„
Moving Average update
[
mVavg
]
Settable range: 0(no function)/1~10 times;
Jittery Display caused by the reasons as like as
noise or unstable signal. User can set the times to
average the readings, and get smoothly display.
Remark: To set the moving average times with higher
wouldn’t affect the response time of Relay and
Analogue output except the 1
st
updated display value
will be slower.
The meter’s sampling is 15cycle/sec. If the
[
mVavg
]
(Moving Average) set to be 3 expressed
the display update with 15 times/sec.,
In the first updated display value will be same as
average function. In the next updated display value, the
function will get the new fourth sample (sample 4) then
throw away the first sample (sample 1) that the newest
3 samples(sample 2,3,4) will be calculated for the
updated display value.
Moving Average set to be 3
Sample 1 Sample 2 Sample 3 Sample 4 Sample 5 Sample 6
…….
In first 3 samples, Display Update Value
= (Sample 1 + Sample 2 + Sample 3)/3
Display Update Value
= (Sample 2 + Sample 3 + Sample 4)/3
Display Update Value
= (Sample 3 + Sample 4 + Sample 5)/3
Display Update Value
= (Sample 4 + Sample 5 + Sample 6)/3
…….
„
Digital filter
[
Dfilt
]
Settable range from 0(None)/1~99 times.
The digital filter can reduce the influence of spark
noise by magnetic of coil.
If the values of samples are over digital filter
band(fixed in firmware and about 5% of stable reading)
3 times (Digital Filter set to be 3) continuously, the meter
will admit the samples and update the new reading.
Otherwise, it will be as treat as a noise and skip the
samples.
ST-LC series offer the 2 relay outputs with more
flexible and multi-functions. They can be programmable
individually in
[
relay group
]
。
Please refer to the
description as following;
„
Relay energized mode
[
ry_.md
]
Hi / Lo / Hi(Lo) latch /
DO
●
Hi ( hi ) (Fig.1- c ): Relay will be energized,
when PV > Set Point
●
Lo ( lo ) (Fig.1- d ): Relay will be energized,
when PV < Set Point
Hi / Lo Relay Energized Fig.1
Hi S etting
Hi Re la y E nergized
ON
Lo S etting
Hi Re la y E nergized ON
hi
lo
[
ry_.sp
]
[
ry_.sp
]
[
ry_.md
]
d
c
●
Hi alarm & latch / Lo alarm & latch ( hIhld / lOhld )
The relay energized with latched function is for
electrical safety and human protection.
For example, a current meter relay installed for the
over current alarm of motor. Generally, over current of
motor caused by over load, mechanical dead lock, aging
of insulation and so on. Above cases will alarm in the
meter, if the user doesn't figure out the real reason and
re-start the motor. It may damage the motor. The
functions of Hi.HLD & Lo.HLD are designed must be
manual reset the alarm after checking out and solving
the issue. It's very important idea for electrical safety
and human protection.
As the PV Higher (or lower) than set-point, the relay
will be energized to latch except manual reset by from
key in
[
user level
]
rYrst is closed.
R elay Energized Latch & Reset
H i. H Ld (H i L at ch )
R e la y En erg iz ed
O N
R eset Relay Latch
b y ECI or Fron t Key
ON
Le vel T rig ge r
H i Settin g
hIhld
[
ry_.md
]
rYrst
[
eci._
]
[
ry_.sp
]
●
do(Digit Output) ( do ):
The function has been designed not only a meter but
also an I/O interface. In the case of motor control
cabinet
can't get the remote function. It's very easily to
get the ON/OFF status of switch from ST-LC series with
RS485 function.
If the
[
ry_.md
]
had been set do , the relay will be
energized by RS485 command directly, but no longer to
compare with set-point.
„
Start delay band
[
rYsb
]
and Start delay time
[
rYsd
]
The functions have Been designed for,
1. To avoid starting current of inductive motor (6 times of
rated current) with alarm.
2. If the ry_.md relay energized mode had been set to
be lo (Lo) or lOhld (Lo & latch). As the meter is