Pulsafeeder Pulsar DLC - Manual (Page 6)

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1. Introduction
The DLC is a microprocessor based stroke length control device for use with the PULSAR diaphragm
metering pump. It has been designed with many advanced features that allow the DLC to operate in a wide
variety of industrial environments.
This instruction manual covers the DLC -- Digital Stroke Length Controller. All standard features are
covered in this manual and most options have instructions where applicable.
1.1 Description
The DLC is an electromechanical servo controller dedicated to the PULSAR diaphragm metering pump
series. The unit is physically attached and integrated into the pump's design. It's purpose is to precisely
adjust output flow of a process media by means of stroke length positioning.
The DLC is designed for the international industrial market. The device is factory configured and
calibrated for the attached pump. The man/machine interface is user friendly. Local setup and control is
achieved through the nine button keypad and a back-lit two-line liquid crystal display. Basic operation is
simple with dedicated function keys eliminating the need for a sophisticated menu system. The DLC
responds immediately to user commands. Pump output is displayed as a percentage of stroke length
position or in units of calibrated flow: CMH, GPH, LPH, CCH, CMM, GPM, LPM, CCM. In addition,
the DLC display supports any one of four languages: English, French, German, or Spanish.
Analog signals and MODBUS™ serial communications offer flexible remote control. They are fully
isolated -- from each other as well as earth ground -- for improved protection and reliability. A Batch
feature, with up to three independent programs, supplements the control features and allows for greater
flow turndown.
The DLC is designed to simplify and automate the calibration of pump flow and analog signals. Flow
calibration uses on-screen prompting, automated pump operation, and automatic curve fitting to eliminate
stop-watches, calculators and human inaccuracies. Analog signal calibration is also accomplished by
simple key-pad entry. It includes a real-time display of signal level. This eliminates the need for external
meters.
The DLC readily accepts PULSAlarm ® leak detection and drum level inputs. These may be configured to
stop the pump and/or activate an alarm relay. Failures are time and date stamped into memory for later
retrieval. Other diagnostics include analog signal failure and line power failure. These are time and date
stamped as well and may be preset to control stroke position or motor status upon detection of a failure.