Power Automation Sweden AB

Cylindervägen 8
13152 Nacka Strand
Sweden

Speed monitor, speed monitoring

Speed monitors - safe and convenient standstill and speed monitoring, optionally also without sensors - SAFEMASTER S

The SAFEMASTER S series standstill and speed monitors are used for safe standstill and speed monitoring of drives. The speed monitors detect and signal the standstill and speed of machines and systems in automatic as well as in setup mode. Dold offers efficient and economical solutions for safe sensorless speed monitoring, sensorless frequency monitoring as well as drive monitoring via proximity switches.

The standstill and speed monitor is used in machines and systems where machine movements or moving parts can pose a risk to man and machine. For example, safe monitoring of the reduced operating speed in setup mode increases the safety of the operating personnel. It also increases productivity by preventing unnecessary shutdowns.

Speed monitors - safe and convenient standstill and speed monitoring, optionally also without sensors - SAFEMASTER S The SAFEMASTER S series standstill and speed monitors are used for safe... read more »
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Speed monitor, speed monitoring

Speed monitors - safe and convenient standstill and speed monitoring, optionally also without sensors - SAFEMASTER S

The SAFEMASTER S series standstill and speed monitors are used for safe standstill and speed monitoring of drives. The speed monitors detect and signal the standstill and speed of machines and systems in automatic as well as in setup mode. Dold offers efficient and economical solutions for safe sensorless speed monitoring, sensorless frequency monitoring as well as drive monitoring via proximity switches.

The standstill and speed monitor is used in machines and systems where machine movements or moving parts can pose a risk to man and machine. For example, safe monitoring of the reduced operating speed in setup mode increases the safety of the operating personnel. It also increases productivity by preventing unnecessary shutdowns.

Highlights

  • Up to cat. 4 / PL e or SIL 3
  • Easy and fast adjustment via rotary switch or display, without PC
  • Extensive diagnostic functions
  • Suitable for standard motor feedback systems and proximity switches (depending on type)
  • Convenient, menu-guided parameterisation via front display (depending on type)
  • Sensorless (depending on type) and easy to retrofit
  • Over-, underfrequency or window monitoring
  • Easy to integrate into existing drive solutions

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Safe standstill and speed monitoring with initiators (proximity switches)

Standstill and speed monitor - SAFEMASTER S

The standstill and speed monitors are used for safety-related detection or monitoring of a standstill and additionally for monitoring a set speed window (lower and upper speed limit) in setup or automatic mode. To detect standstill or the speed of the motor, the speed (frequency) is measured by means of two NPN or PNP proximity switches (special design variant with NAMUR sensors) or via encoders (sin/cos, TTL, HTL) with two signal tracks. A combination of encoder and one NPN or PNP proximity switch is also possible.

Safe sensorless standstill monitoring

Standstill monitor  - SAFEMASTER S

The safe sensorless standstill monitors of the SAFEMASTER S series detect the standstill of 3-phase and 1-phase motors independent of the direction of rotation. Otherwise required sensors, such as encoders or proximity switches, are not required. Access to the hazardous area of a system is only granted by the enable signal of the standstill monitor after the drive has been switched off and coasting. To detect a standstill, the remanence voltage induced by the motor windings is evaluated and thus offers safe standstill monitoring up to Cat. 4 / PL e or SIL 3, even if the motor has already been switched off.

Safe detection of standstill, e.g. for:

  • Safety circuits according to IEC / EN 60204 in plants with dangerous machine parts or tools, e.g. for the release of protective devices
  • Avoidance of machine damage when unexpected running in the process can lead to collisions
  • Motor controls with reversal of direction of rotation

Safe sensorless frequency monitoring

Frequency monitor  - SAFEMASTER S

The speed and frequency monitors monitor frequency-controlled drives without sensors and safely up to 690 V. Sensorless frequency monitoring eliminates the need to install additional proximity switches or initiators. The frequency monitor thus creates new possibilities for design, planning and retrofitting, even for larger machines and systems, e.g. in woodworking or machine tools.

The frequency monitors are used for safety-related detection or monitoring of overfrequency, underfrequency or for monitoring a set frequency window. In case of deviations or violation of the set window range, the frequency monitor switches off safely and shows its strengths compared to frequency inverters with integrated safety functions when simplicity, flexibility and safety are required in equal measure.

standstill monitor

Standstill and speed monitors Safety functions according to DIN EN 61800-5-2

According to the new Machinery Directive, the operating state of a drive must be safely monitored and maintained when it is stopped. Typical applications include the release of safety gate interlocks after the standstill of the hazardous movement has been detected, as well as working with open guards and reduced speed during machine setup operation. With its extensive product range of sensorless standstill monitors, Dold already offers a convenient solution for safe standstill monitoring (UG 6946).

With appropriate wiring, the safety functions STO (safe torque off), SOS (safe operating stop), SLS (safely-limited speed), SSM (safe speed monitoring) and SSR (safe speed range) can be implemented. SAFEMASTER S series standstill and speed monitors offer maximum safety up to Cat. 4 / PL e or SIL 3.

Safety functions according to DIN EN 61800-5-2

Sicher abgeschaltetes Moment - Safe Torque Off (STO)

Safe Torque Off (STO)

No energy is supplied to the motor that can cause rotation (or motion in the case of a linear motor). The PDS(SR) does not supply energy to the motor that can cause torque (or force in the case of a linear motor).

 Sicherer Betriebshalt - Safe Operating Stop (SOS)

Safe Operating Stop (SOS)

The SOS function prevents the motor from deviating from the stop position by more than a specified amount. The PDS(SR) provides the motor with the energy that allows it to withstand being attacked by external forces.

 Sicherer Drehzahlbereich - Safe Speed Range (SSR)

Safe Speed Range (SSR)

The SSR function keeps the motor speed within specified limits.

 Sicher begrenzte Drehzahl – Safely-Limited Speed (SLS)

Safely-Limited Speed (SLS)

The SLS function prevents the motor from exceeding the set speed limit.

 Sichere Drehzahlüberwachung – Safe Speed Monitor (SSM)

Safe Speed Monitor (SSM)

The SSM function provides a safe output signal to indicate if the motor speed is below a specified limit.

Technical contribution - Standstill monitoring without sensors

Eliminating hazards by electric drives

Stillstandsüberwachung Fachbeitrag

Standstill monitor technical contribution (pdf)

Application areas speed monitor

The safe speed monitors offer a convenient and compact solution for safety-related speed monitoring, as used in wind turbines, centrifuges or stage technology. The speed monitors are also used, for example, in woodworking, conveyor technology or machine tools.

Safety gate monitoring by means of standstill monitors and solenoid interlock with command function

For maintenance work, the system is shut down in a controlled manner by actuating the stop function on the solenoid interlock (1). Access to the hazardous machine area is monitored by the UG 6946 (2). Only after a safe standstill has been detected does the standstill monitor release the solenoid interlock and the safety guard (3) can be unlocked. When the safety guard is opened, dangerous movements must be switched off immediately and secured against restarting. Only then can the service technician safely enter the system. The enabling switch is taken into the safety area of the machine for its own protection (4).

Drehzahlwächter

Safe drive monitoring combined with the SAFEMASTER STS safety switch and key transfer system

SAFEMASTER STS is the reliable safety switch and key transfer system used to safeguard separating protective devices of machines and systems. The SAFEMASTER STS product range includes electromechanical safety switches, solenoid interlocks (safety switches with guard locking), key transfer and safety command devices.

Product portfolio - Safe drive monitoring - SAFEMASTER S

  • Standstill monitor (standstill monitoring) - UG 6946
  • Standstill and speed monitor (standstill and speed monitoring) - UH 6932
  • Speed and frequency monitor (speed and frequency monitoring) - UH 6937