Cleveland Motion Controls ULTRA SERIES UNDER PILLOW BLOCK TRANSDUCER UPB1 REV AA - Manual (Page 7)

MAN-70254R EV . AA U LTRA S ERIES U NDER P ILLOW B LOCK T RANSDUCER
P AGE 7 OF 18
1.4.3 C RITICAL R OLL S PEED
Even with a balanced roll, a vibration can be set up in a stationary shaft. If this vibration (in cycles per minute)
occurs at the harmonic frequency of the shaft, the transducers can be damaged. To determine critical roll speed, use
the following formula:
Critical roll speed in RPM = 4.8 x 106 x Shaft O.D.
(Shaft Length)
2
(Dimensions are in inches)
To assure that this issue is avoided, the critical roll speed should be at least 20% above the roll speed attained at
maximum web speed.
1.4.4 A VOIDING D AMAGE TO THE R OLL
To avoid damaging the transducer, refrain from repetitive overloading above the maximum working force or severe
overloading.
1.4.5 E XCITATION V OLTAGE
Maximum Excitation Voltage for the Ultra Series Under Pillow Block transducers must be limited to 5.6 VDC or 5.6
VRMS. Do not use 10 Volt excitation or possible damage to the semiconductor strain gage elements can occur.
Before applying power to the amplifier, verify that the amplifier excitation voltage has been set to 5.0 VDC.