Function Overview - Baelz Automatic 6490B Device Manual

Device manual

1. Function overview

Basic device
Analog input Pt100
Relay OPEN
Relay CLOSE
Relay ALARM
Additional functions (option*)
Serial interface RS 485
Supply voltage 24 V DC
The optional digital input is definable to one of these functions by software:
Digital input OPEN
Digital input CLOSE
Digital input STOP
Digital input SP.2
Setpoint limiting. Minimum value SP.L (setpoint low), maximum value SP.H (setpoint high).
Only setpoints within the setpoint limiting can be set via front keyboard.
Setpoint ramp SP.r. Setpoint change per minute or hour (gradient). Can be specified for internal and external
setpoints by the setpoint ramp.
Filtering FIL of the process variable input PV. Interference signals and fast fluctuations of the process variable
PV can be smoothed by an adjustable software filter.
* Digital inputs, voltage range 0/12-24 V DC.
* Serial interface RS 485 (modbus, RTU-mode).
W. Bälz & Sohn GmbH & Co.
Analog input for the process variable PV
Controller output OPEN: opens the actuator
Controller output CLOSE: closes the actuator
Alarm relay operates on the base of the idle current principle
Data transfer in accordance with modbus protocol.
For 24 V DC digital input and also 2-wire-transmitter at current input*
Actuator opens ...
Actuator closes ...
Actuator persists in its current position ...
To switch over to the second setpoint SP.2 ...
... if connecting 24 V DC (active state) to the appropriate digital input.
Priority: 1. STOP (highest priority), 2. CLOSE, 3. OPEN, 4. SP.2
Koepffstraße 5 D-74076 Heilbronn
6490B / 6490B-y / 6590B
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not in manual mode
Telefon (07131) 1500-0
Page 4
* option
Telefax (07131) 1500-21