The VS12 is a vibration switch designed to protect rotary machines (such as motors, pump and fans, etc.) by shutting the system down when an excessive rate of vibration has been detected. Machine vibration is constantly monitored by the VS12 and when the limit has been exceeded, an output is triggered, so that the machine is either disarmed or an auxiliary alarm is activated to prevent damage or a state of process shutdown.
Technology: The VS12 uses a 1-axis accelerometer to monitor misalignment and imbalance generated by incorrect installation, machine defects or faulty windings or bearings, etc.
2 modes of operation can be configured to either disarm the system or create an alarm state without disarming the system when indicating a failure due to excessive vibration is preferred. Programming the unit is achieved with a magnet pen (included) and does not require the use of software. Just set the limit (as expressed in the percentage of excess vibration) which can be adjusted between 5% and 100% of the full scale/range of vibration (normally 1 inch or 25.4mm/second RMS). When the vibration exceeds this limit, the output state changes. A programmable delay function enables the user to also set a time delay for tripping the output so that false shutdowns or alarms can be avoided. There is also a non-programmable initial start-up delay of 10 seconds to allow for system stabilization.
The VS12 also features a Bypass function, which enables the user to bypass the VS12 without removing it from the system. This allows the machine to continue operating, so as
not to interrupt an important plant process until maintenance personnel can schedule the repair of the rotating machine. The VS12 operates with only 2 wires. Installation should be made in series with the contactors.
Application: Monitor and alarm misalignment and imbalance on rotating machines
Power supply: 24Vdc +/- 10%
Output: 1 x SPST (5A/250Vac & 5A/24Vdc)
Output type: Alarm mode (NO)/ Disarm mode (NC)
Programming: Time delay / Setpoint alarm / Output state / Bypass mode
Set point Error: +/- 3%
Vibrating range: 0…1 in/s (25.4mm/s) RMS
Frequency range: 10Hz to 1000Hz
Sensor type: 1 axis accelerometer
Temperature range: -10…70°C
Process connection: 1/4″ BSW / NPT or BSP
Electrical connection: M12 Connector or Crimped cable (2 meters)
Class protection: IP66
Body material: 316L SS