Festo DFPI Series, Инструкции

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8 Commissioning
CAUTION!
Uncontrolled movements of the drive may cause damage.
Note the following:
•
When the compressed air supply is switched on and the setpoint specification
or power supply is missing, the drive moves to the safety position.
• During initialisation, the two end positions are approached in succession
regardless of the pending setpoint value.
• To prevent the drive from moving to the safety position when the power sup­
plies are switched on, first switch on the operating voltage supply and the
setpoint specification and then the compressed air supply.
• Make sure that the operating conditions are within the permissible ranges
è 13 Technical Data
• Make sure that an attached slide gate plate (process valve) can be positioned
without obstacles.
• If necessary, adjust the adapters attached to the piston rod. This setting is
used to optimise the opening or closing behaviour of the connected process
valve or shut­off valve.
• First, select a slow travel speed. This requires first completely closing flow
controls D2 and D4. Then unscrew flow controls D2 and D4 two or three turns.
• After assembly, always carry out an initialisation at commissioning.
Initialisation
The DFPI is pre­initialised at the factory. The internal positioner is then adjusted
for travel without a load, without flow control, and for use of the entire stroke
length.
Analogue setpoint Setpoint position at pre-initialisation from the factory
<
3.5 [mA] Safety position; advance piston rod (end position)
4.0 …
<
4.2 [mA] Advance piston rod (end position) with maximum control force
4.2 …
<
19.8 [mA] Controlled intermediate position
1)
19.8 …
<
20.0 [mA] Retract piston rod (end position) with maximum control force
>
20.5 [mA] Safety position; advance piston rod (end position)
1) The setpoint characteristic curve is linear.
Tab. 3
A new initialisation process is required in the following cases:
–
at commissioning after installation of the device
– after adjustment of flow control screws D2 and D4
– after a change in the operating pressure
– after changes in the process that reduce the forces, e.g. on the slide gate,
and thus influence process parameters
– after changing the stroke length in use.
Initialisation shifts the setpoint and actual value characteristic curves in accord­
ance with the programmed end positions. This establishes the reference between
the analogue setpoint value and setpoint position as well as between the ana­
logue actual value and actual position.
Example DFPI-...-990 -...: initialisation to stroke length l = 200 … 800 mm
1 Factory setting 2 Characteristic curve after initialisa­
tionend position 1 = 200 mm
end position 2 = 800 mm
Fig. 10
During initialisation the end positions of the DFPI are approached automatically.
This teaches the positioner the available and/or used stroke length. After suc­
cessful initialisation, the DFPI is ready for operation. The integrated positioner
now ensures that the slide gate moves to the desired positions in a controlled
manner – as a maximum to the end positions programmed during initialisation.
Perform initialisation
Initialisation of the drive must be started from the safety position.
1. Switch on the operating voltage supply.
2. Switch on the compressed air supply. The drive moves to the specified set­
point position.
3. Apply a logic 1 (+24 V) to pin 5 for t
>
1000 ms, e.g. by briefly bridging pin 1
and pin 5 è Fig.11 1 . The initialisation process then starts è Fig.11 2 .
During the initialisation procedure a current value of 21.5 mA is output at the ana­
logue output.
After completion of initialisation, the DFPI is ready for operation (
è Fig.11 3 ). It
then travels to the specified setpoint position.
If a valid setpoint value (4 … 20 mA) is not pending, a current of 3.5 mA is ana­
logue output and the drive moves to its safety position.
Fig. 11
9 Operation
WARNING!
Risk of injury due to unexpected movement of components.
Body parts in the movement range of the piston can be crushed or severed.
•
Protect the positioning range from unwanted intervention.
• Keep foreign objects out of the positioning range.
NOTICE!
Continuous operation at the limit of the specified ambient temperature and
operating frequency.
Reduction in the service life of the drive.
•
Use lubricated compressed air for continuous operation under extreme condi­
tions. The oil must be chemically inert (chemical­resistant) and must not car­
bonise.
After the compressed air supply is switched on, the drive travels as follows:
–
The drive moves to the safety position if the operating voltage supply or the
analogue setpoint value is outside the permissible range.
– The drive moves to the specified analogue setpoint position if the operating
voltage supply is within the permissible range, depending on the end posi­
tions programmed during initialisation.
Switching off the DFPI
Switch off the energy supplies in the following sequence to ensure that the integ­
rated valve block can safely exhaust the drive:
1. Switch off the operating voltage supply.
2. Switch off the compressed air supply.
The piston rod can only be shifted manually if the drive is exhausted, e.g. to push
the piston rod in for safe transport.
10 Malfunctions
10.1 Fault clearance
Malfunction Possible cause Remedy
The DFPI closes the process
valve, even though a different
setpoint value is specified. Operating voltage supply or
analogue setpoint value out­
side the permissible range
(e.g. wire break); the DFPI
assumes the safety position Check operating voltage supply
and analogue setpoint.
The piston rod cannot be shif­
ted manually even though the
energy supply is switched off. Drive is not exhausted because
the compressed air supply was
switched off first and then the
operating voltage supply Switch off the operating voltage
supply first, and then the com­
pressed air supply.
Initialisation fails Setpoint value at the analogue
input causes signal malfunc­
tions. Switch off setpoint specifica­
tion.
Current at the analogue output
£
3.5 mA
Device error Check operating voltage sup­
ply, operating pressure and
analogue setpoint.
Current at the analogue output
= 21.0 mA The device must be teached­in Initialise device.
Current at the analogue output
= 21.5 mA Device is in teach­in status –
Tab. 4
10.2 Repair
Send the product to the Festo repair service for repair.