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3.3
Method of operation
The command value for this power amplifier is transmitted via Profibus. The power stage gets activated with
an ENABLE signal. This signal consists of a hardware unlocking (digital input) and a software unlocking (bit on
Profibus). An error free operating is reported by a READY signal (digital output and bit on Profibus). If the mal-
function monitoring is active (SENS), the power stage and the READY signal will be deactivated when a failure
is detected. Depending on the setting of SENS the failure has to be erased by resetting ENABLE.
In mode 195 a command value of ±100% is affected. In case of a detected error the device gets deactivated.
In mode 196 two command values of 0... 100% are affected. Each channel has its own ENABLE bit on the
Profibus for using both channels independently from each other. If a solenoid error occurs only the defective
channel will be deactivated. The READY signal will be switched off because of this error, but the error free
second channel stays in operation.
3.4
Commissioning
Step
Installation
Switching on for the first
time
Setting up communication
Pre-parameterization
Control signal
Switching on the hydrau-
lics
Setting up Profibus
Activating ENABLE
Remote control mode
Page 11 of 37
Task
Install the device in accordance with the circuit diagram. Ensure it is wired correctly
and that the signals are well shielded. The device must be installed in a protective
housing (control cabinet or similar).
Ensure that no unwanted movement is possible in the drive (e.g. switch off the
hydraulics). Connect an ammeter and check the current consumed by the device. If
it is higher than specified, there is an error in the wiring. Switch the device off imme-
diately and check the wiring.
Once the power input is correct the PC (notebook) should be connected to the
serial interface. Please see the WPC-300 program documentation for how to set up
communication.
Further commissioning and diagnosis are supported by the operating software.
ATTENTION! The COMPORT (in WPC-300) has to be closed before the USB plug
is to be disconnected. Otherwise the WPC-300 is going to be instable.
Now set up the following parameters (with reference to the system design and circuit
diagrams):
The nominal output CURRENT and the typical valve parameters such as DITHER
and MIN/MAX.
Pre-parameterization is necessary to minimize the risk of uncontrolled movements.
Check the control signal with an amp meter. The control signal (the current of the
solenoid) is within the range of 0... 2, 6A. In the actual status it should show approxi-
mately 0 A.
ATTENTION! You can also monitor the solenoid current in the WPC-300 program.
The hydraulics can now be switched on. The module is not yet generating a signal.
Drives should be at a standstill or drift slightly (leave its position at a slow speed) if it
is a proportional valve.
Establish the connection with GSD file and configuration of the data bytes. The slave
address can be set via Profibus or preset fix via the WPC program.
CAUTION! The drive can now leave its position and move to an end position with full
speed or the pressure can reach maximum. Take safety measures to prevent per-
sonal injury and damage.
If the Profibus is not available at first commissioning of the system, the amplifier can
be controlled via the WPC program. For that the remote control mode In the monitor
view of the WPC program can be activated.
CAUTION! The WPC program will take the whole control over the device then. The
Enable signal at PIN 8 and the bus interface are inoperable in this case.
PAM-199-P-PDP
05.06.2020
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