Operation
8.3 Differential Speed Detection
BW500 and BW500/L
98
Operating Instructions, 12/2016, A5E33482052-AD
8.3
Differential Speed Detection
Dual point speed sensing is used for monitoring speed at two points in the system where a
difference in speed can be detrimental to the equipment or its operation. The two speed sensors
are typically applied on belt conveyors to give an alarm if excessive slip between the head pulley
and tail pulley is detected. The secondary speed sensor is especially useful on variable speed
conveyors, and may also be used to detect a malfunction in the primary speed sensor.
The BW500 provides a 12 V DC, 150 mA maximum, regulated power supply for both speed
sensors. The primary speed sensor is used for all "Run" display integration, and is the reference
value for differential speed detection. The primary speed sensor is generally reserved for the
driven device (tail pulley). The second speed sensor is generally reserved for the driving device
(head pulley), and is used for comparison to the primary speed sensor, for differential speed
detection only.
The second speed signal is compared to the primary speed signal, and will initiate an alarm
condition if the second speed signal is outside the programmed high and low alarm setpoints.
Connect the second speed sensor as shown in the Installation section (refer to
AuxiliarySpeed
Sensor
), and program the second speed sensor as described in the following steps:
1.
Program one of the Auxiliary Inputs as a Speed Sensor input P270-01 to 05 = 16 (Speed
Sensor).
2.
Program second speed sensors speed constant P015-02 = pulses per meter or foot (Refer to
Start Up on page 29, for speed sensor programming).
3.
Program one of the alarms for Differential Speed Detection alarm P100-01 to 05 = 10 (Speed
Differential).
4.
Program the High Alarm setpoint P101-01 to 05 = 110% (default).
5.
Program the Low Alarm setpoint P102-01 to 05 = 90% (default).
Note
Differential speed detection is not available on the BW500/L.
8.4
Moisture Compensation
Moisture Compensation is used to compensate for the moisture component of the material being
weighed. It factors out the moisture component of load, rate and total for all multispans selected.
The factored value is meant to report the dry mean values of the material being conveyed.
The BW500 receives the static load cell signal, and adjusts the value of the load being displayed
and integrated by the moisture percentage. The mA I/O card is required to accept the mA signal
from the Moisture Meter. This mA signal can represent 0 to 100% moisture. The moisture
percentage is displayed in P398-01. Using P398-02, the moisture percentage can be
represented as a percentage of mass to be deducted from the total mass
1)
.
1)
The BW500/L allows for a fixed moisture content to be entered. See “P398-01 Moisture
Summary of Contents for Milltronics BW500
Page 1: ...Operating Instructions Milltronics BW500 and BW500 L 12 2016 Edition Integrators ...
Page 12: ...Table of contents BW500 and BW500 L 10 Operating Instructions 12 2016 A5E33482052 AD ...
Page 14: ...Safety Notes BW500 and BW500 L 12 Operating Instructions 12 2016 A5E33482052 AD ...
Page 16: ...The Manual BW500 and BW500 L 14 Operating Instructions 12 2016 A5E33482052 AD ...
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Page 218: ...Index BW500 and BW500 L 216 Operating Instructions 12 2016 A5E33482052 AD ...
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