Work Instruction - Pulse Rate Adjustment

The Pulse Sensor is the heartbeat of the Guardian Wash Command system. It provides feedback from the conveyor that can verify that the conveyor is running, and the speed that the conveyor is operating.

Pulse Sensor Choice: The GWC can accept one or two sensor input signals. Choose “1” or “2” to accept either signal. On the Tunnel status page, the pulse light will blink green when working with the wired pulse sensor. If either pulse sensor fails and a pulse fault alarm occurs, choose “3” to go to stand by pulse to continue operating at a recorded pulse rate. The pulse light on the Tunnel Status page will flash blue when operating on stand-by pulse. The recorded rate is displayed in the “Stand-By Pulse Rate” data field, and can be easily recorded by pressing the “Set Pulse” button when the conveyor is operating normally and correctly with a wired pulse sensor input signal. Whenever the conveyor speed is changed, this button should be pushed to record the new rate. If the rate is inaccurate when operating with stand by pulse, the rate can be adjusted by touching the data field and manually adjusting the rate. The pulse rate is actually the time measured between pulses, so if functions are turning on late as the vehicle travels through the tunnel, the pulse rate needs to be decreased, and if functions are turning on early, the pulse rate needs to be increased.

Below are standard 5” Pulse (8 Flags with 17 tooth sprockets) stand-by Pulse Rate numbers based on the Frequency speed of the conveyor. (Note that this is a baseline that may need to be adjusted):

Conveyor Speed to Pulse Rate Conversion Chart

Conveyor Speed (Hz)	70	65	60	55	50	45	40
Standby Pulse Rate	.280	.340	.370	.405	.449	.504	.566