General Description
1 General description
The HE 5722 filter controller is used to measure differential pressure and to pulse magnetic
valves of the kind encountered in industrial dust removing applications.
The use of an MB90F347 microprocessor facilitates flexible selection of functions and extensive
monitoring functionality.
●Visual indication:
The unit has a four-digit display for the differential pressure. This display shows either the
value measured with the pressure sensor or that measured via the current input. The
current valve appears on a two-digit display. States and errors are indicated by twelve
LEDs.
●Differential pressure measurement:
The differential pressure across the filter is measured by means of a pressure sensor
integrated in the unit. The standard measuring range is 0 to 100 mbar; other measuring
ranges are possible on request. The actual differential pressure is indicated on a four-
digit display with one decimal place.
●Valve actuation:
Up to 24 valves can be actuated. The valve current is monitored, which means
overcurrent or interruptions at the valve controller output can be detected. The following
valve control functions are freely selectable:
- Threshold-controlledcleaning
- Post-cleaning of the complete filter
- Time-controlledforced cleaning
- Cleaning with separately settable control times
- Multiple pulse actuation of a valve
- Interval time proportional to differential pressure
●Inputs:
The filter controller has four electrically isolated inputs via which the “Stop”, “Rapid
cleaning”, “Post-cleaning” and “Acknowledge fault” commands are forwarded to the
microprocessor. The controller has a USB port for software updates. A standard signal (0
(4) to 20 mA) can be measured via an analogue input. The external signal and the internal
differential pressure signal can be used simultaneously. The stronger signal takes priority,
in other words a cleaning cycle can be started even if the programmed thresholds are not
yet exceeded.
●Outputs:
Three relays are provided for status, error and cleaning messages as well as special
functions ( cycle counter and lag time for discharge devices). These functions and the
FAILSAFE and HOLD switching modes are freely selectable.
The differential pressure is output via a non-isolated analogue output (0 (4) to 20 mA).
●Cleaning thresholds:
A high and low threshold can be set on the unit. Cleaning starts when the high threshold
is exceeded and ends when the low threshold is exceeded.
●Alarm thresholds:
You can program two alarm thresholds, which are indicated by means of LEDs.
The alarms can be assigned to the relays.
●Parameter protection:
The parameters can be protected with an access code.
