SafWatch® Panel

SafWatch® Device

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.

Additional Features Include:

• 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

Drive Train Discontinuity
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

Differential Motion
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

Commanded Not Operated
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

In Motion
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

Watch Dog Circuit
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.

Encoder Line Receiver
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.

Modular Input / Output Units
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.