Safety
Logic
MSR57 Speed Monitoring Safety Relays
Improve Productivity and Simplify Control System Operation, While Enhancing Operator Protection Through Guardlocking
The MSR57P speed monitoring safety relay from Rockwell Automation is the first of its kind to allow personnel to safely enter hazardous areas while motion is present. It supports numerous input devices such as E-stops, safe speed selector switches, enabling switches and guardlocking switches to completely monitor the machine and the controls required to operate it. The MSR57P increases productivity by unlocking guard doors when zero speed is detected.
The speed of the motion is monitored by the MSR57P through the use of encoders. The relay supports single or dual encoder applications and monitors the signals from pre-installed encoders if available.
Drive explorer or a HIM device—the same tools required to program standard drives–are used to configure and monitor the status of the MSR57P.
Safe-Speed Functionality
- Safe Stop (SS) — Commands the machine to stop per the pre-configured stop category. This input places a request on the drive to stop the machine. If the machine does not stop within the configured time, a stop fault occurs to remove power to the drive.
- Safe Limited Speed (SLS) — When the speed of the machine is below a safe limit, the door(s) will be unlocked to provide access. If the speed exceeds this value while SLS is active, the system will react per the pre-configured stop category.
- Enabling Switch Monitoring (ESM) — Used in conjunction with SLS to permit motion only when the enabling switch is held in the middle position. Can be used to monitor personnel while in the machine area and motion is present.
- Safe Maximum Speed (SMS) — Limits the maximum speed the machine can run before a stop category is executed.
- Safe Maximum Acceleration (SMA) — Monitors acceleration of the machine and commands one of the stop categories when the pre-set limit has been exceeded. SMA can catch an over speed fault early if the machine begins accelerates exponentially from zero speed.
- Safe Direction (SD) — This configured parameter allows the user to select a "safe" operating direction for the machine. If the machine rotates in the opposite direction as configured, the pre-configured stop category will be executed.
Conditional Guardlocking Functionality
- Door Control and Monitoring (DC and DM) — Built in logic monitors and controls the door(s) to allow access only during safe conditions.
- Zero Speed Monitoring — Once standstill has been detected, the MSR57P will unlock the door(s) to allow entry to machine.
Features
A wide variety of on-board safe speed control functions:- Supports up to 2 encoders
- Cat 4 per EN954-1
- SIL CL3 IEC 61508 , PL e
- Stop Categories 0,1 and 2
- Enabling Switch Supported
- 6 N.O. Safety Outputs
- 4 Auxilary Outputs
- 8 Diagnostic LEDs
- DPI configuration port
- Removable terminals
- 67.5mm Enclosure