KEP DRT Operating Manual
DRT SERIES
MODEL:
DRT
DUAL RATE / TOTALIZER
INSTALLATION & OPERATING INSTRUCTIONS
http://www.kep.com
99675 12/04/00
KESSLER-ELLIS PRODUCTS
10 Industrial Way East
Eatontown, NJ 07724
800-631-2165 • 732-935-1320
Fax 732-935-9344
Proprietary Notice
The information contained in this publication is derived in part from proprietary and patent data of the Kessler - Ellis
Products Company. This information has been prepared for the expressed purpose of assisting operating and maintenance personnel in the efficient use of the instrument described herein. Publication of this information does not convey any
rights to use or reproduce it or to use for any purpose other than in connection with the installation, operation and
maintenance of the equipment described herein.
Copyright 1989, Kessler-Ellis Products Co.
Printed in USA. All Rights Reserved.
WARNING
This instrument contains electronic components that are susceptible to damage by static electricity. Proper handling*
procedures must be observed during the removal, installation or handling of internal circuit boards or devices.
*Handling Procedure
1. Power to unit must be removed.
2. Personnel must be grounded, via wrist strap or other safe, suitable means, before any printed circuit board or other
internal device is installed, removed or adjusted.
3. Printed circuit boards must be transported in a conductive bag or other conductive container. Boards must not be
removed from the protective enclosure until the immediate time of installation. Removed boards must be placed immediately in a protective container for transport, storage or return to factory.
Comments:
This instrument is not unique in its content of EDS (electrostatic discharge) sensitive components. Most modern electronic
designs contain components that utilize metal oxide technology (NMOS, CMOS, etc.). Experience has proven that even
small amounts of static electricity can damage or destroy these devices. Damaged components, even though they appear
to function properly, exhibit early failure.
TABLE OF CONTENTS
SPECIFICATIONS ..................................................................................................1
DECODING PART NUMBER..................................................................................2
HOW TO MOUNT THE UNIT..................................................................................3
WIRING DRT ..........................................................................................................4
TYPICAL HOOKUPS ...............................................................................................5
WHAT CAN YOU VIEW ..........................................................................................6
OUTPUT JUMPER SELECTIONS..........................................................................6
MILLIVOLT INPUT OPTION JUMPER SELECTIONS............................................6
OPERATING FRONT PANEL.................................................................................7
PROGRAMMING FLOW CHART ...........................................................................7
PROGRAM CODES & DESCRIPTIONS ................................................................8
DRT TERMINATIONS.............................................................................................10
CALCULATING SCALE FACTORS ........................................................................11
DRT PROGRAMMING PROCEDURE....................................................................12
SETTING SCALING FACTORS..............................................................................12
SETTING THE COUNTER......................................................................................13
SETTING THE RATE..............................................................................................14
SETTING THE LOCK CODE & LOCKING THE UNIT ............................................15
SETTING THE RELAYS & PRESETS ....................................................................16
OUTPUT WIRING ...................................................................................................18
ANALOG OUTPUT OPTION...................................................................................19
RS232/RS422 SERIAL COMMUNICATIONS.........................................................20
TROUBLESHOOTING GUIDE................................................................................23
WARRANTY ............................................................................................................24
THIS PAGE IS BLANK
DESCRIPTION & SPECIFICATIONS
DESCRIPTION:
The DRT (Dual Rate Totalizer) is a dual 5 digit Ratemeter 6 digit
Totalizer in a 1/8 DIN package. User selects 1 of 6 displays to
show A,B or C rate and A,B or C total. Inputs A and B have
separate scaling to read in engineering units.
A 4-20mA (0-20mA) output of the C rate or total is optional.
The user can press the VIEW button to see 6 separate items
total A, total B, total C, rate A, rate B, rate C. Negative values are
displayed with a negative symbol ( user can choose from the following combination of A&B inputs:
TOTAL; with a choice of A+B or A-B; RATIO with choice of
A÷B(x100) to show percent of A to B quantity or A÷[A+B(x100)] to
show percent of A to total quantity.
Two independent presets are standard. User selects whether output A is activated by total or rate value of input A or selected C.
Output B can be activated by total or rate value of input B or
selected C. Outputs activated by A or B total can be set to latch or
autorecycle with an adjustable output duration from 00.1 to 99.9
sec. For rate, ratio, or C total outputs pull in when value is equal or
above the preset and drop out when value is below the preset
minus the selected 0 to 999 hysteresis.
SPECIFICATIONS:
DISPLAY
6 digit, 0.55" High LED
INPUT POWER:
110 VAC ± 15% or 12 to 15 VDC
220 VAC ± 15% or 12 to 15 VDC
24 VAC ± 15% or 12 to 15 VDC
CURRENT:
250 mA DC max. or 6.5 VA AC
OUTPUT POWER (AC powered units only)
+12 VDC @ 50 mA, unregulated -10 + 50%
TEMPERATURE:
Operating:
+32°F (0°C) to +130 F (+54°C)
Storage:
-40 F (-40°C) to +200°F (93°C)
MEMORY
EEPROM stores data for 10 years if power is lost.
INPUTS:
3: High Impedance DC pulse input 4-30 VDC (high), Open or 0-
1 VDC (low),10 KΩ imp. 10 kHz max. speed. Accepts simultaneous inputs. May be used with KEP 711 series or PD & D
series sensors.
3M: Mag. Input, Input A only, accepts 30mV input (50 V max. P/P)
signals 10 KΩ imp. 5 kHz max. (Input B, 4-30V)
3MB: Mag. Input, Inputs A & B, accepts 30mV input (50 V max. P/
P) signals 10 KΩ imp. 5 kHz max.
NOTE: The Mag. inputs have filtering as follows: up to 300hz
@30mV, 5KHz @ .25V to 50V max.
12345
). For the C value, the
RESET:
Front Panel: Resets displayed value and control output
Remote: 4-30 VDC negative edge resets all counters,
"A" counter or "B" counter (user selectable).
K FACTOR/SCALING
The DRT has two separate K-Factors that are used to convert the
input pulses to engineering units. The 5 digit K-Factor dividers,
with decimal keyed into any position, allow easy direct entry of any
K-Factor from 0.0001 to 99999. Separate factors may be entered
for the 2 separate input channels.
CONTROL OUTPUTS:
Relays:
2 each N.O. Relay; 10 Amps120/240 VAC or 28 VDC.
(N.C. relay contacts and NPN transistor output
available with solder jumpers. Transistor output is
internally pulled up to 10 VDC through relay coil, sinks
from 10 VDC to .5 V @ 100 mA)
Analog Output:
An optional 4-20mA (0-20mA) output is available for
the DRT. The output can be programmed
to track rate or total of the C display. This feature is available
by adding suffix A to the part number. Connections are
via a 2 terminal pluggable screw connector.
Programming is accomplished by using the front panel
in conjunction with rear dip switches.
Accuracy: 50uA worst case.
Compliance Voltage: 3 to 30 VDC non inductive.
RS232/RS422SERIAL INTERFACE
If the serial interface option is supplied, up to 99 units can be linked
together. (The terminal addressing the unit must be capable of
driving all loads in the loop.) Unit status and new set points can be
communicated by serial communication. Mode changes, however,
must always be made on the front panel. Data is transmitted at
selected baud rates using standard seven bit ASCII characters and
parity with two additional bits of “Start” and “Stop” to make up the
standard ten bit character.
Data is received and transmitted over standard EIA RS232 or
RS422 levels. Each 10 bit character is made up of a start bit, 7 bit
ASCII code, parity bit and stop bit. Unit number, baud rate and
parity are entered in the “Program Setting” set up mode and remain
in memory even if power is off.
Note that the input impedance of RS232 is 3K or 7K Ohm worst
case. The terminal addressing the unit must be capable of driving
all loads in the loop. RS422 input impedance is much higher and
there is usually no problem driving 25 units. Unit serial transmit line
remains in a high impedance “OFF” state until addressed.
PRESETS
Two control outputs are provided. To set relay values, press “menu”
button until “Relay” appears on the display , the A and B outputs can
be assigned to the A,B or C displays. A 5 digit value can be entered
for both presets and the decimal point location is the same as the
counter. The outputs can be set to energize from 0.1 to 99.9
seconds or latch (0.0). If a value other than 0.0 is entered, the
counters will auto reset at the preset (for A&B counters).
1
SPECIFICATIONS
(continued)
DECODING PART NUMBER
LOCKOUT
Unauthorized front panel changes can be prevented by entering a
user selected 5 digit code. The front panel can be completely
locked out or the presets can remain accessible.
RATEMETER
Accurate to 4 1/2 digits (±1 display digit). The ratemeter uses 1/tau
with 8 digit math, can sample from 2 to 24 seconds maximum, and
auto-range up to 5 digits of significant information. In the “RPS”
mode, the ratemeter displays in units per second, and in the
“scale” mode, units per hour or per minute. The unit will display the
rate of the A&B Inputs.
COUNTER
The two 6-digit counters can count at 10Khz speed. Each has a
seporate 5-digit dividing scale factor. The counters advance on the
positive edge of each pulse. Besides being able to step through the
total and rate values of A & B inputs, the user can see a selected
combination of total or rate of A+B, A-B, A÷BX100 (percent of A to
B), A÷A+BX100 (percent of A to total). A negative display will be
veiwed as a 5 digit display with a negative symbol ( -
12345
).
Example: DRT A 3 A
Series:
DRT= 6 digits counter, 5 digit ratemeter
with presets and scaling.
Operating Voltage:
A= 110 VAC ± 15% or 12 to 15 VDC
B= 220 VAC ± 15% or 12 to 15 VDC
C= 24 VAC ± 15% or 12 to 15 VDC
Count Inputs:
3 = Standard, 4-30 VDC simultaneous inputs.
3M = Mag. Input, Input A only, 30mV input
(Input B, 4-30V)
3MB = Mag. Input, Inputs A & B, 30mV input
Options
1= RS232 Communications
2= RS422 Communications
A= Analog Output (4-20/0-20 mA)
CE = CE Approved Version
NOTE: RS232/RS422 & Analog Output options can not be combined
2
HOW TO MOUNT THE UNIT
The unit is designed to be mounted with a gasket providing a water tight seal. Two mounting brackets are provided to
secure the unit to the panel. A panel less than .1" may distort if the clamps are screwed too tightly.
Slide the body of the unit through the rubber gasket. Insert the unit into the panel. As shown in "FIG. A", slide the brackets
up the groove to press against the back of the panel. Insert screws into rear of brackets and tighten them evenly and
alternately. Do not over tighten! A normal level of torque is required. Maximum torque should be 3" pounds.
This product is designed to be panel mounted and is NEMA 4 rated if proper mounting procedures are followed and the
required and supplied hardware is correctly used.
If the panel in which the unit is mounted is less than .125 of an inch thick, the possibility exists that there will be some
flexing. Should this flexing occur, the resulting deformation of the panel could cause a loss of the water tight seal. In case
this should occur, the use of silicone or other sealant would be recommended.
This product is designed to the NEMA 4 rated. However, the fact that we are unable to control either the location in which
the device is installed or the actual installation itself requires that the company's liability shall extend only to the repair or
replacement of a defective product.
We are prepared to offer additional assistance in those special situations where normal mounting methods do not seem to
satisfy the customers needs. This assistance may be obtained by calling the factory and asking for Application Engineering.
FIG A
DIMENSIONS
3.925
(99.7)
4.437
(112.7)
2.625
(66.68)
0.587
(14.91)
BEZEL
GASKET
4.245
(107.8)
CUSTOMER PANEL
Panel Thickness 0.062" (1.5)
to 0.187" (4.7) max.
3.622
(92)
1.772
(45)
3
WIRING THE DRT
The rear terminal contains 12 screw terminals for connecting #14 to #28 gauge wire.
The unit is controlled by a microprocessor and, therefore, an electrically "noisy" environment could cause operating
problems. The input power line should not be common to power lines for motors, pumps, contactors, etc.
The unit is designed to be immune from line or RF voltage interference. In some environments voltage spikes of over 100
volts, even 1000 volts, can occur. When common to a power line driving motors voltage fluctuations can be extreme and
rapid. Lines driving DC or AC solenoids, relays, or actuators can also cause problems.
Four sources of noise can occur:
1) AC power line noise - If the unit cannot be connected to a clean power source, an inductive load suppressing device
(MOV as GE # V130LA1 or Resistor Capacitor as Paktron # .2 uf/220 ohm @ 400V) can be installed. Although locating
the suppressor across the AC supply at the unit should help, best results are obtained by connecting the suppressor
across the leads of the "load" at the device causing the spike.
2) Input line noise -The noise is carried on the input and D.C. ground lines. Make sure the input wires are never run into
the unit in a bundle with power input lines. Also, keep these input lines isolated from inductive lines from devices
drawing heavy loads. If there is a possibility of electrical noise, we recommend using shielded cable, with the shield
being hooked to the D.C. ground terminal on the instrument, and to "earth" at one point in the circuit, preferably at the
D.C. ground terminal of the unit.
3) Output lines - The unit has two relay outputs. When these outputs are used to run external relays or solenoids, spikes
can be generated upon activation. This noise can spread through the instrument causing operating problems. If the
source is a D.C. operated device, a general purpose diode (IN4004) placed across the solenoid prevents electrical
noise spikes. Connect the cathode (banded side) to the more positive side of the coil. If the source is an A.C. operated
device, use a MOV or Resistor Capacitor across the coil.
4) 12 VDC output supply - Noise can be generated on the 12 VDC output supply if it is used to drive inductive loads or if
the current draw exceeds 50 mA. Insure that all inductive loads have a diode (such as IN4004) across the coil and that
the current does not exceed 50 mA.
4
CONNECTING AC / DC POWER
NOTE: Connect power only after other connections are finished. Do not touch the live AC power terminals! The unit has
been designed with an isolated AC input. Thus, polarity is not a concern for the AC input. The chassis is plastic, therefore
earth ground is not used. For D.C. operation, connect + 12V to pin 7 and - D.C. to pin 8.
CONNECTING SENSOR INPUTS
These diagrams show how to hook typical input sensors to the unit. The unit supplies an unregulated 12 Volt (50mA)
output to power these sensors (Pin 7).
A valid pulse is one which makes a transition from the off-state (0 to 1V) to the on-state (4 to 30V): a positive going edge.
The input impedance is 10K Ohms to ground. The unit can be programmed from the front panel for slow switch closure
inputs up to 40Hz (select "Lo CPS"), or solid state switches (select "hi CPS") up to 9.99KHz. No rear terminal jumpers are
required. Use PNP (sourcing) type pulsers.
TYPICAL SENSOR HOOKUP
RELAYS
A
B
TURBINE FLOWMETER
1 COMMON
2 N.O. (N.C./NPN)
3 COMMON
4 N.O. (N.C./NPN)
5 A INPUT
6 B INPUT
7 12 V OUTPUT/ + DC INPUT
8 - DC (GROUND)
9 RESET INPUT
10 NOT USED
11 AC INPUT
12 AC INPUT
*
COUNT
POWER
GROUND
D08N
* PULLUP RESISTANCE
4.7K TYPICAL
POWER
COUNT
GROUND
D12P
TYPICAL FLOW SENSOR HOOKUP
STRIP CHART
RECORDER
+
-
PULSE OUTPUT
PULSE OUTPUT
+12V
GND
1- COMMON
2- N.O.(N.C./NPN)
3- COMMON
4- N.O.(N.C./NPN)
5- A INPUT
6- B INPUT
7- 12VDC OUT/+DC IN
8- -DC (GROUND)
9- RESET INPUT
10- NOT USED
11- A.C. INPUT
12- A.C. INPUT
RELAYS
A
B
SWITCH
ON
13- V+
14- I SINK
OFF
RUN
4-20mA
RATE
RUN
1 2 3 4
OUTPUT
ON
CAL.
0-20mA
COUNT
SET
ANALOG
TURBINE FLOWMETER
5
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