Schmalz SCPSi - Monitoring the Supply Voltages; Evaluating the Inlet Pressure; Calibrating the Vacuum Sensor

7 General Description of Functions
EN-US · 30.30.00.00424 · 07 · 10/23 35 / 86
7.8Monitoring the Supply Voltages
The ejector is not a voltage meter! However, the measured values and the system responses
derived from them provide a helpful diagnostics tool for condition monitoring.
The ejector measures the supply voltages U
S
. The measured value can be read from the parameter data.
If the voltages are outside the valid range (min. 19.2V and max. 26.4V), the following status messages
change:
• Device status
• Condition monitoring parameter
• An IO-Link event is generated
There is no guarantee that the ejector will operate as intended below a supply voltage of 19.2V:
• The reaction to signal inputs is disabled.
• The “Part Present” check output retains its normal functionality.
• The current supply voltage can still be viewed using the UP button.
• The pneumatic state of the ejector changes as follows:
– For the NO-type ejector, the ejector switches to the “suction” operating
state
– For the NC-type ejector, the ejector switches to the “pneumatically OFF”
operating state
7.9Evaluating the Inlet Pressure
The available supply pressure level in the system cannot be measured by the ejector itself. However, the
current measured value for the inlet pressure can be transmitted to the ejector from the system controller
via IO-Link. In this case, the ejector evaluates the pressure level and activates a condition monitoring
warning if the pressure level is not optimal. If there is a significant deviation, an error message is also gen-
erated.
A pressure level must also be transferred to enable the volume of compressed air consumed in the suction
cycle to be estimated in the area of energy monitoring.
7.10Calibrating the Vacuum Sensor
As the production conditions for the internally integrated vacuum sensor can vary, we recommend cali-
brating the sensor once it is installed in the ejector. To calibrate the vacuum sensor, the system's vacuum
circuit must be open to the atmosphere.
The function for zero-point adjustment of the sensor is performed in the main menu under the parameter
CAL or using IO-Link.
1. Press the MENU button
ð The menu changes to input
2. Press the UP or DOWN button until cal appears on the display
3. Confirm with the MENU button
4. When YE5 appears, press the MENU button to confirm.
ð The vacuum sensor is now calibrated.
A zero offset is only possible in the range of ± 3% around the theoretical zero position.
When the permissible limit is exceeded by ±3%, error code E03 will appear on the display.