Motion relays for safe standstill and speed monitoring

Wieland motion relays monitor standstill, speed or rotational movement so that hazardous machine motion can be evaluated without a programmable safety controller. Depending on the device, monitoring can be sensorless or use initiators or HTL encoder signals. Select by monitored motion function, sensor interface, speed or frequency range, safety outputs, switching capacity, start and reset behaviour, terminal technology and required safety level.

MOTION RELAYS

Motion relays comprise two types of motion monitoring devices, namely standstill monitors and speed monitors. Neither incremental encoders nor proximity sensors are required to measure the operating status with standstill monitors. Safe monitoring of the machine or system with speed monitors is carried out together with incremental encoders or proximity sensors.

SENSORLESS
STANDSTILL MONITORS

SVM 4001K - MOTION RELAYS

SVM 4001K-A

The device has screw terminals

SVM 4001K-C

The device has push-in terminals

SPEED MONITORS
WITH SENSORS

SNS 4074K / 4084K - MOTION RELAYS

SNS 4074K

The device has a bypass input with which the safety-related bypassing of the monitoring function is possible, e.g. when a safe position is reached. In this case, the signal must correspond to at least the safety category of the selected monitoring function.

SNS 4084K

The device has an input for start-up bridging with which the safe outputs can be switched off while a machine is at a standstill. This can be used, for example, to activate a spring-loaded guard locking of a safety device when the machine starts up.

The SNS 4084K standstill monitor ensures safe monitoring of the frequency of a signal at inputs I1 to I4 of the device. If the frequency of the pulses is higher than the frequency set on the rotary switches (0.1 - 99 Hz), the outputs Q1/ Q2 switch off. This monitoring function can be used to detect the standstill or low, safe speed of a machine.

In such applications, for example, a spring- or solenoid-operated guard locking of an electrical locking device can be controlled by the outputs of the device. The sensors for detecting the movement can be, for example, two inductive proximity switches or an incremental encoder, which are connected to inputs I1 - I4. The frequency of the pulses to be monitored is set on the two rotary switches and is stored in the device by pressing the ENTER button while the voltage is being applied to the device.

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WITH THE WIELAND SAFETY EXPERTS

Safety has been our daily business – for more than 30 years. On the way to CE marking and safe operation, we are your reliable partner and contribute our experience to your project. Whether training or consulting: We put together your individual all-round carefree package for thestandard-compliant implementation of your machines. We support manufacturers and operators either in specific sub-steps such as inspection and overrun measurement, risk assessment of machines or validation of safety functions according to EN ISO 13849-2, or we accompany them holistically through the CE process up to CE conformity assessment according to machine directives.

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