Position: The LCp-200 Weight/Rate-By-Weight Controllers are high performance indicators with features and options focused on the requirements of process weighing applications with local setpoint control. They operate with all strain gage type load cells and interface easily with any PLC, DCS, or PC based supervisory control system. Engineering emphasis has been placed on simplicity, reliability, and expandability. Standard rate-by-weight operation and output provides precision mass flow control.
Controller FEATURES
1 million count resolution, 20 updates per second
High resolution (16 Bit) analog output
RS-422/485 communication port with ASCII, Vishay BLH
Digi-System Plus network, or Modbus RTU protocol
Expansion slot for A-B remote I/O, Modbus Plus, Profibus, or DeviceNet
Rate-by-weight (mass flow) operation
Up To 8 setpoint relay outputs
Quick-cal set-up
Dynamic digital process filtering
Real time system & loop diagnostics
DESCRIPTION of weight controller
Eight relay outputs are available for local setpoint control, based upon set point values entered through the keypad, or downloaded serially from a host device. All relay configuration and logic parameters are selectable through the front panel keypad. Communication of weight, setpoint values, system status, and diagnostic information is accomplished using standard protocols such as ASCII and Modbus RTU, or special serial interfaces like DeviceNet, Allen-Bradley Remote l/O, Modbus Plus, and Profibus. The LCp-200 Safe-Weigh Software System encompasses over 50 years of Vishay BLH application expertise.
Plug-n-Weigh quick calibration and setup procedures save time, money, and even field service calls. On-line diagnostics continuously monitor system performance and alert service personnel to potential problems before they happen.
APPLICATIONS of weighing controller
Weight and mass flow measurement with setpoint control
blend/mix/Batching systems
High value Batching processing
CONFIGURATION
Setpoint Control and Communication Interfaces
Setpoint Availability
Precise setpoint control ensures accurate and repeatable batch process performance. Standard LCp-200 instruments have eight open collector DC setpoint output signals. Individual outputs can be configured for main (coarse) or dribble (fine) operation with in-flight and deadband (hysteresis) compensation for precision valve control. Polarity selection allows ‘open above’ or ‘closed above’ operation of each point.
Tag names may be assigned for front panel or interface identification. Optionally, eight solid state, triac type outputs can be ordered. Each triac output has the same configuration and parameter selections as the DC signals.
Communications and Interfacing
LCp-200 instruments are designed for fast, easy interfacing with virtually any PLC or DCS system. LCp-200 instruments are the first weight/rate system weight controllers with Schneider Automation Modbus Plus licensing. As a charter member of the Allen-Bradley ‘Encompass’ program, Vishay BLH offers Remote l/O capability in all LCp products. Profibus can be ordered for communication with Seimens weight controllers. For network applications, units can be ordered with our Digi-System Plus protocol for communication with an LCp-400 Gate-Weigh batching controller.
>>>>>
Open collector setpoint outputs interface with PLC I/O cards and optional solid state triac relays control process valves directly
Performance
Resolution 1,048,576 total counts
Displayed Resolution 700,000 counts
Conversion Speed 50 msec
Displayed Sensitivity 0.05 μV per count
Noise 0.4 μV per count (min. filt.
setting)
Full Scale Range 3.5 mV/V
Dead Load Range 100% full scale
Input impedance 10 m-ohms min
Excitation Voltage 10 Vdc @ 250 mA
Linearity ± 0.0015% full scale
Software Filter multi-variable up to 10,000 msec
Step Response one conversion
Temp Coefficient Zero ± 2ppm/°C
Temp Coefficient Span ± 7ppm/°C
Environment
Operating Temperature -10 to 55° C (15 to 131° F)
Storage Temperature -20 to 85° C (-5 to 185° F)
Humidity 5 to 90% rh non-condensing
Voltage 117/230 Vac +15% @ 50/60 Hz
Power 15 watts max
Enclosure
Dimensions (std) 4.63 x 8.40 x 6.5 in. HWD
NEMA 4/4X, 12 (opt) 8.5 x 13.5 x 10.45 in. HWD
Materials
Aluminum Case & Bezel overlay meets 94V-0 rating
Display
Type high intensity cobalt green
vacuum fluorescent
Active Digits 7 digit alpha numeric .59" high
for weight: 8 digit alpha numeric
.39" high for status
Analog Output (Optional)
Conversion 16 bit D-A
Current Selectable 4-20 mA or 0-20 mA - 600 ohm max.
Remote Digital Inputs (Optically Isolated)
(Contact closure or do logic compatible)
Closed (Momentary) logic low
Open logic high
Cable Length 100 feet max.
DC Setpoint Outputs - 8 (Standard)
Type open collector (current sinking)
Operating Voltage 5 - 35 Vdc
ON Voltage 1.2 Vdc @ 40 mA
0.8Vdc @ 1 mA
OFF State Leakage 0.04 μA @ 40 Vdc
Power external supply required
AC Setpoint Outputs - 8 (Optional)
Type triac
Operating Voltage 12 - 240 Vac
AC Frequency 20 - 500 Hz
ON State Voltage Drop 1.2 Vrms
Min - Max Load Current 5mA- 1A
Leakage Current 1mA @ full rated load voltage
Power external supply required.
Communications (Standard)
Serial RS-422/485 full or half duplex ASCII, printer,
Provox, or Modbus protocols
odd, even or no parity- selectable
Baud Rates 300, 1200, 2400, 4800, 9600,
or 19200
Addressing 0 - 99
Special Interfaces (Optional)
DeviceNet to ODVA specification
Allen-Bradley Remote l/O - 1/4 Logical Rack
Modbus RTU slave
Modbus Plus peer-to-peer
Profibus slave.
Approvals/Certifications of weighing controller
FM (factory Mutual) 3611 (Div 2)
CSA C22.2 (all applicable sections)
Vishay BLH is continually seeking to improve weigh controller product quality and performance. Specifications may change accordingly.
