Manitowoc RFF, Technician'S Handbook

Page: 85 / 164

Part Number 000015433_03 5/20 85
ROTATION SENSOR
RFF0620 / RNF0620 / RNF1100 / RNF1020C / RFF1300
RNF2000C / RFF2500
Light Definition
Yellow Blinking Time Delay Period
Yellow Solid Normal Operation Sensing
Red Blinking 2
Flashes Per Second
Time Delay Period - First 1 To 7 Faults
Red Solid Lockout - 8 Consecutive Faults Due To A
Speed Fault
Remove/Restore Power To Reset
Red Blinking Slowly Lockout - 8 Consecutive Faults Due To A
Short Circuit
Operation:
1. At start up, the sensor starts an 8 minute compressor
time delay period.
2. After 8 minutes the sensor energizes the compressor
contactor and ignores rotation for 20 seconds.
3. After 8-minutes, 20 seconds the auger rotation
must not fall below 4 rpm or exceed 13 rpm; normal
rotation is 9-10 RPM. When the auger rotation is
less than 4 rpm or more than 13 rpm the sensor
de-energizes the compressor contactor, starts an 8
minute time delay period and flashes the red led.
When the 8 minute delay period ends the compressor
will restart.
4. If the rotation sensor detects 8 consecutive RPM out
of range failures the sensor locks out the compressor
contactor and energizes the red led. The rotation
sensor must be reset by cycling power off/on.
NOTE: Verify all electrical connections are secure and free
of corrosion whenever rotation sensor lockouts exist.