Wisco Industries DP21 User manual

WISCO DP21 Manual V1.1 Page I
Wisnu and Supak Co., Ltd 102/111-112 Tessabansongkroh Rd., Ladyao, Jatujak, Bangkok 10900
Tel [phone], Fax [phone], www.wisco.co.th, E-mail [e-mail]
Rate Meter & Totalizer
DP21

Page II WISCO DP21 Manual V1.1
-
[phone], [phone]-1, [phone], www.wisco.co.th,  i[email protected]

WISCO DP21 Manual V1.1 Page 1 of 8
Wisnu and Supak Co., Ltd 102/111-112 Tessabansongkroh Rd., Ladyao, Jatujak, Bangkok 10900
Tel [phone], Fax [phone], www.wisco.co.th, E-mail [e-mail]
Rate Meter & Totalizer
DP21
Normal Operating Mode
In the normal operating mode the display indicate either the rate or the
counter. And „r‟ on the left of the display signifies the rate. The display may
be toggled by pressing the „Select‟ (SEL) button.
Totalizer
Module DP21 receives incoming pulses and multiplies them by the
Count Scale Factor. The unit‟s counter (internal count value) keeps track
of the scaled input pulse count which results in the desired reading value
for the count display.
The Count(s) reset to zero when a manual reset is performed. At
loss of power to the unit, the contents of the counter are saved. This
allows counting over consecutive shifts, days, etc. The total count can
accumulate to 99,999,999 (The counter value will roll over and flesh „tot
OVEr‟ when the count value exceeds 99,999,999 indicating an overflow
condition.
Rate
Module DP21 use a time interval method to calculate the rate
value. The unit counts on the negative edge of the input pulses. After the
programmed minimum update time elapses and the next negative edge
occurs, the unit counts the number of edges that occurred during the
elapsed time. The number of edges is multiplied by the rate scaling value
to calculate the rate value.
At slower rates, averaging can be accomplished by programming the
rate minimum update time for the desired response. Extensive scaling
capabilities allow practically any desired reading at very slow count rates.

Page 2 of 8 WISCO DP21 Manual V1.1
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[phone], [phone]-1, [phone], www.wisco.co.th, [email protected]
Programming Mode
Programming or Normal Mode Selection
When power is applied to the DP21, it will be in Normal operating
mode. To change to the Programming Mode press the „Select‟ button and
hold it for 5 seconds. To change back to the normal Operating Mode just
do the same as Programming Mode.
Programming Description
Programming the DP21 is done with front panel buttons. Although
the unit has been programmed at the factory. The parameters generally
have to be changed to meet the user‟s requirements, to enter the
Programming Mode.
Pressing the select button scrolls through the menus. The display
alternately flashes between the menu and the currently selected data.
Pressing the „Reset‟ button stops the display from flashing and enters the
unit into Data Modification Mode.
In Data Modification Mode, a menu provides one of two types of
parameter to program.
1. Selection Type –The operator presses the reset button to
through the various parameter available for that menu or to toggle
between „YES‟ or „NO‟ selection. Pressing the „Select‟ button will exits from
Data Modification Mode and advances to the next menu.
2. Numerical Type –The „Reset‟ button increments the numerical
value of the flashing digit. Momentarily pressing the „Select‟ button
advances to the next digit. To advance to the next menu first press the
„Select‟ button and without releasing it press the „Reset‟button.
All parameter value are saved when exiting the programming mode.
To exit from Programming Mode press „Select‟ button and hold for 5
seconds.

WISCO DP21 Manual V1.1 Page 3 of 8
Wisnu and Supak Co., Ltd 102/111-112 Tessabansongkroh Rd., Ladyao, Jatujak, Bangkok 10900
Tel [phone], Fax [phone], www.wisco.co.th, E-mail [e-mail]
Programming Menus
1. SECLECT ENABLE (dSPSEL)
The front panel Select button can be enabled (Yes) OR disabled (No)
during normal operation. If „No‟is selected, the display remains either on
the rate or counter display(s) depending on which was viewed when
programming was entered.
2. RESET ENABLE (rSt Enb)
The front panel Reset button can be enabled (Yes) or disabled (No)
during programming. The counter may not be reset via the front panel if
disabled.
3. COUNTER A DECIMAL POINT (tot dP)
There are six decimal point locations available for the count display.
The decimal point locations are used for the count display only and are
independent of the rate display.
0
0.0
0.00
0.000
0.0000
0.00000
0.000000
4. COUNTER A SCALE FACOTR (SCLFAC)
The scale factor is prescaler, therefore changing the scale value
does not change the existing internal count, and only effects the incoming
pulse count. The count scale factor Value can range from 0.0001 to
99.9999.

Page 4 of 8 WISCO DP21 Manual V1.1
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[phone], [phone]-1, [phone], www.wisco.co.th, [email protected]
5. RATE ENABLE (rAtE Enb)
Selecting “Yes” enables the rate indicator function. If disabled (No),
the rate programming steps will not appear. This affects the rate only.
Note: the precision of a counter application cannot be improved by
using a scale factor greater than one. To accomplish greater precision,
more pulse information must be generated per measuring unit.
6. RATE DECIMALPOINT (rAtE dP)
Select the desired decimal point position for the rate display,
independent of the count display.
0
0.0
0.00
0.000
0.0000
0.00000
7. RATE DISPLAY (rAtE dSP)
Program the desired rate display value which corresponds to the
programmed rate input (rate INP) value. The rate display value can be
programmed from 000001 to 999999.
8. RATE INPUT (rAtE INP), (Hz)
Program the rate input value that should correspond to the rate
display (rAtE dSP) value. The rate input value can be programmed from
00000.1 to 99999.9 and should correspond to the signal input frequency.
9. MINIMUM UPDATE TIME (Lo-Udt), (Seconds)
This is the minimum amount of the time between display updates
for the rate display. This affects the rate display only. The low update time
ranges from 00.1 to 99.9 seconds. To assist in stabilizing an erratic
display, increase Lo-Udt for a display averaging effect.

WISCO DP21 Manual V1.1 Page 5 of 8
Wisnu and Supak Co., Ltd 102/111-112 Tessabansongkroh Rd., Ladyao, Jatujak, Bangkok 10900
Tel [phone], Fax [phone], www.wisco.co.th, E-mail [e-mail]
10. MAXIMUM UPDATE TIME (Hi-Udt), (Seconds)
This is the maximum amount of time before the rate display goes to
zero. The rate display goes to zero if the time between successive pulses
exceeds the high update (Hi-Udt) time. The high update time ranges from
00.1 to 99.9 seconds.
11. FACTORY SETTINGS (FACt SEt)
All of the parameters are restored to the factory default settings
when YES is selected and the front panel select button is pressed. The
DP21 displays „LoAd‟for several seconds and then returns to programming
of Factory Settings parameter. Factory settings for all the programmable
values are listed below.
dSPSEL YES
rSt En YES
tot dP 0
SCLFAC 01.0000
rAtE En YES
rAtE dP 0.00000
rAtE dSP 0.00001
rAtE INP 01.0 (Hz)
Lo-Udt 01.0 (Seconds)
Hi-Udt 01.0 (Seconds)
12. ADDRESS (Addr)
Program the address of DP21.The address of DP21 can be
programmed from 00 to 99.
13. BAUD RATE (bAUd)
Program the communication baud rate of DP21.

Page 6 of 8 WISCO DP21 Manual V1.1
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[phone], [phone]-1, [phone], www.wisco.co.th, [email protected]
Scaling for Count Indication
The DP21‟s scale factor is factory set to 1, to provide one count on the
display for each pulse that is input to the unit. In many applications, there
will not be a one-to-one correspondence between input pulses and display
units. Therefore, it is necessary for the DP21 to scale or multiply the input
pulses by scaling factor to achieve the desired display units (feet, meters,
gallons, etc.).
The incoming pulses are multiplied by the count scale factor value and
stored in the internal count register which results in the desired count display
value. The scale factor is a prescaler, which means changing the scale factor
does not changes the existing internal count, but only effects the incoming
pulse count.
The Count Scale factor Value can range from 0.0001 to 99.9999. It is
important to note that the precision of a counter application cannot be
improved by using a scale factor greater than one. To accomplish greater
precision, more pulse information must be generated per measuring unit. The
following formula is use to calculate the scale factor.
Scale Factor = Desired Display Units x Decimal point Position
Number of pulse
WHERE:
Desired display units : Count display unit acquired after pulse
that occurred
Number of Pulses : Number of pulses required to ahieve the
desired display units
Decimal Point position :
0 = 1
0.0 = 10
0.00 = 100
0.000 = 1000
0.0000 = 10000
0.00000 = 100000

WISCO DP21 Manual V1.1 Page 7 of 8
Wisnu and Supak Co., Ltd 102/111-112 Tessabansongkroh Rd., Ladyao, Jatujak, Bangkok 10900
Tel [phone], Fax [phone], www.wisco.co.th, E-mail [e-mail]
EXAMPLE:The counter display is used to indicate the total number of
feet units to be displayed. The decimal point is selected to
show the resolution in hundredths.
Scale Factor = Desired Display Units x Decimal point Position
Number of pulse
Give that 128 pulses are equal to 1 foot, display total feet with a one
hundredth resolution.
Scale Factor = 1.00 x 100
128
= 0.007812 x 100
= 0.7812
Scaling for Rate Indication
Scaling the Rate involves programming the DP21 so that input
Frequency to the unit are scaled to the desired display units.
Note : It is not necessary to increase the pulse information to obtain
higher resolution.
The operator keys-in a display value and a corresponding rate value.
The location of the scaling point should be near the process end limit for the
best possible accuracy. Once these values are programmed, the indicator
calculates the slope of the rate display automatically and scaling is complete
after decimal point selection. Input frequency can be read directly if rate
display and rate input value is programmed to „1‟and „1.0‟.
Note : The rate display will flesh “r OLOLOL” if the display exceeds
999,999 which means the unit must be re-scaled.
DISPLAY
INPUT
rAtE dSP = 5000
rAtE INP = 10000.0 Hz
0
10
KHz
NOTE: STARTING POINT OF SLOPE
DIAGRAM IS ALWAYS ZERO (0)

Page 8 of 8 WISCO DP21 Manual V1.1
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[phone], [phone]-1, [phone], www.wisco.co.th, [email protected]
If the rate application is to display a specific display unit, it is only
necessary to know the number of pulses per desired display unit/s (feet,
revolutions, etc.) and in the desire time format, per second (1), per minute
(60), or per hour (3600) to scale the rate display. Use the following formula
to calculate the rate input value.
rAtE INP (Hz) = rAtE dSP x __Pulses per unit__
desired time format
WHERE:
rAtE INP = Rate input Value (Hz)
rAtE dSP = Desired rate display value
Pulse per unit = Number of actual input pulses
Desired Time Format Select
-Per Seconds = 1
-Per Minute = 60
-Per Hour = 3600
EXAMPLE: Display is to indicate 1575 revolutions per minute (RPM).
Input pulses are 39 pulses per revolution.
rAtE INP (Hz) = 1575 RPM x 39PPR
60
= 1023.75
Since the rate input value can only be programmed in tenths, the value
is recalculated by increasing the rate display value by a factor of ten. The
display value is continually increased until one of the following is reached.
- The rAtE INP valuse‟s least significant digit is no similar than a tenth
- The rAtE dSP value exceeds 999,999
- The rAtE INP value exceeds 99,999.9
Note: For two and three, use the value that was calculated prior to
exceeding that value.
rAtE INP (Hz) = 15750 RPM x 39PPR
60
= 10237.5
15750 is entered for the rAtE dSP
10237.5 is enterd for the rAtE INP
Edited: 18/03/2016