Monitoring Your Critical Lifting Equipment
American Crane's SafWatch® Device can help you enhance your new or existing equipment with increased safety protection. The SafWatch® provides a fail safe control system which exceeds the requirements of NUREG 0554 and ASME NOG-1.SafWatch® allows you to take the safety of your equipment to the next level.
SafWatch® Monitoring Includes:
Overspeed
Detect Operation in Excess of Design Speed
Detect Difference Between Drum and Motor Speed
Compare the direction and speed of the hoist to the direction and speed initiated by the operator
When the equipment does not respond to a command to operate
Operator notification of hoist up and down motion that is independent of the hoist control circuit providing compliance with NOG6411.6(f)
Detect drum movement not initiated by operator input or drum movement in the wrong direction
Independent hard wired circuit to detect failure of the SafWatch™ processors and power supply
Unique encoder line receivers utilized for hoist motor and drum direction / speed feedback to increase reliability and fault detection
Rack mounted modular I/O units to allow a mix of analog, digital, and serial inputs and outputs at different voltage levels
American Crane's SafWatch® Device can help you enhance your new or existing equipment with increased safety protection. The SafWatch® provides a fail safe control system which exceeds the requirements of NUREG 0554 and ASME NOG-1.SafWatch® allows you to take the safety of your equipment to the next level.
SafWatch® Monitoring Includes:
- Operation in excess of design speed as well as monitoring operator requested speed compared to actual speed
- Incorrect movement including wrong direction, wrong response to operator request, lack of movement and unauthorized motion
- Independent Hard Wired Watch Dog Circuit monitoring SafWatch® processors and power supply
- Unique Encoder Line Receivers to provide feedback for hoist motor and drum direction and speed
- Rack mounted Modular Input / Output Units providing flexibility by allowing a mixture of input and output types
Overspeed
Detect Operation in Excess of Design Speed
- Detect overspeed in excess of 115% of critical lift speed
- Detect overspeed in excess of 115% of non-critical lift speed
- Brakes are automatically applied when an overspeed fault is detected
Detect Difference Between Drum and Motor Speed
- Detect incorrect drum movement (Speed Differential)
- Response time may vary based on existing driveline design
- Brakes are automatically applied when drive train discontinuity is detected
Compare the direction and speed of the hoist to the direction and speed initiated by the operator
- Response time may vary based on existing drive acceleration, deceleration and operator reverse plugging
- Brakes are automatically applied when differential motion is detected
When the equipment does not respond to a command to operate
- Detect lack of drum movement when drum movement is initiated by the operator
- Detect failure of encoder feedback and control circuit
- Response time may vary based on existing driveline design and drive torque proof testing
- Brakes are automatically applied when a commanded not operated fault is detected
Operator notification of hoist up and down motion that is independent of the hoist control circuit providing compliance with NOG6411.6(f)
- Detect upward or downward drum movement and prompt operator
Detect drum movement not initiated by operator input or drum movement in the wrong direction
- Detect incorrect upward or downward drum movement
- Detect reversal of drum rotation
- Response time may vary based on hoist drive deceleration or operator initiation of reverse plugging
- Brakes are automatically applied when an uncommanded fault is detected
Independent hard wired circuit to detect failure of the SafWatch™ processors and power supply
- Detect 5 VDC and 12 VDC power supply failure
- Detect MCU (Microchip PIC series Microcontroller) hardware or software failure
- Detect CPLD (Complex Programmable Logic Device) hardware or software failure
- Brakes are automatically applied when a watch dog fault is detected
Unique encoder line receivers utilized for hoist motor and drum direction / speed feedback to increase reliability and fault detection
- Allows the use of quadrature differential encoders for long distance operation
- +/-15kV ESD (Electrostatic Discharge) protection, increased common mode rejection
- Alarm flags to indicate open, shorted line conditions, excessive common-mode voltage range, and low-signal strength
- Brakes may be automatically applied when an encoder alarm is detected
Rack mounted modular I/O units to allow a mix of analog, digital, and serial inputs and outputs at different voltage levels
- UL recognized rack and I/O modules ranging from 5 VDC to 240 VAC
- Up to 8 rack slots available for a total of 32 digital input or outputs
- Analog and serial modules supported
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