TRUMETER 7922 Preset counter with 2 relay outputs
239,76 € plus VAT.
2 Stück auf Lager
Description
TRUMETER 7922 Preset counter with 2 relay outputs
This versatile counter with preset function can be configured for square-wave or unidirectional inputs, and for single or double preset with batch preset. Resetting can be performed automatically, manually or electronically via a sink (NPN) or source (PNP) input. The display is a backlit Supertwist LCD with high readability, ensuring it can be read from any angle. The count value is shown in the main display, whilst the preset value (or batch preset value) is shown in the secondary display.
Programming, zeroing and preselection can be carried out via the front panel. When powered from the mains, there is a 12 V DC output for operating a sensor. The buttons below the individual digits can be used to set the P1 or P2 preset value (or batch preset) on the secondary display. The red reset button resets the setpoint on the display to 0 or P1 (depending on the programming).
Features
- Supply voltage 85–265 V AC or 10–26 V DC
- Auxiliary output 12 V DC
- Default values 1–999,999
- adjustable to a maximum of 3 decimal places
- Scaling factor: multiplication 0.00001–9.99999, division 1–99999
- Counting inputs 10–30 V DC, NPN, PNP
- Counting frequency: max. 10 kHz
- Reset manually, externally or automatically
- 2 output relays, 5 A, as normally open or normally closed contacts
- EEPROM data storage
- Backlighting
- Dimensions (W x H x D): 48 x 48 x 93 mm
- CE, UL and cUL certified
FAQ
The 7922 and 7932 use an EEPROM to store the programme settings and count values. This is achieved by monitoring the meter’s internal power supply.
If the external supply voltage is switched off, the internal voltage drops accordingly; this is detected by a special circuit and the safeguard mechanisms are activated, ensuring that all relevant data is saved to the non-volatile memory. In addition, a so-called „checksum“ is generated, which is also stored in the memory.
When the external power supply is switched on again, the processor reads the data from memory, generates a checksum and compares it with the one stored. If the new checksum differs from the one previously stored, the processor interprets this as an error and assumes that a data error has occurred. This results in the message „ERR CH“, which indicates a data error.
This fault may be caused by a fault in the processor, the EEPROM, or by external voltage spikes. If the fault is caused by external voltage spikes, this can be prevented by using suitable filters. A “power-up reset” is required to rectify this fault.
- Switch off the power supply.
- Press the PROG button and the digit 5 button at the same time and hold them down.
- Switch the power supply back on whilst holding down the buttons. Hold the buttons down for approx. 15 seconds until 7922/7932 appears on the display.
- The EEPROM memory has now been reset to its default values and the counter must be reprogrammed.
Additional information
| Supply voltage | 230 V AC |
|---|---|
| Switch output | Relay |