Burkert Type 8712 - Manual (Page 39)

39
Maintenance,Troubleshooting
Type 8626, 8712
8.3.4. set-point value profile
In this operating mode, the device behaves as in standard control mode,
except that the external set-point value is ignored and replaced by a
predefined chronology of up to 30 flow-rate values (configurable with
the "Mass Flow Communicator" software).
This function of the MFC is obtained by activating a binary input
(configured on this function) for at least 0.5 s. The Limit LED (blue)
flashes to signal that the function is in progress.
If the set-point value profile has been activated by binary input and
the input has been reset, once the set-point value profile has been
executed, the device returns to the operating mode it was prior to
activation.
8.3.5. control mode
In this operating mode, the set-point value enables a duty cycle to be
directly supplied to the proportional valve, for example set-point value
10% → duty cycle of the valve = 10%.
This function of the MFC is obtained by activating a binary input or via
the field bus, depending on the configuration of the device (configurable
with the "Mass Flow Communicator" software). The Limit LED (blue)
flashes to signal that the function is in progress.
9. mAinTenAnce,
TroubleshooTinG
9.1. safety instructions
danger
risk of injury due to high pressure in the installation.
• Shut off the gas flow, relief the pressure and drain the pipe
before loosening the process connections.
risk of injury due to electrical voltage.
• Shut down and isolate the electrical power supply before
carrying out work on the system.
• Observe all applicable accident protection and safety
regulations for electrical equipment.
Warning
risk of injury due to nonconforming maintenance.
• This work may only be carried out by qualified, authorized
technicians trained for working in environments where there is a
risk of explosion and using the appropriate tools.
• Ensure that the installation is subject to a controlled restart after
the power supply is switched off.
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