Description
The 3500/50M Tachometer Module is a 2-channel module
that accepts input from proximity probes or magnetic
pickups to determine shaft rotative speed, rotor acceleration,
or rotor direction. The module compares these
measurements against user-programmable alarm setpoints
and generates alarms when the setpoints are violated.
The Tachometer Module is programmed using the 3500 Rack
Configuration software. The following configuration options
are available:
l Speed Monitoring, Setpoint Alarming and Speed Band
Alarming
l Speed Monitoring, Setpoint Alarming and Zero Speed
Notification
l Speed Monitoring, Setpoint Alarming and Rotor
Acceleration Alarming
l Speed Monitoring, Setpoint Alarming and Reverse
Rotation Notification
The 3500/50M Tachometer Module can be configured to
supply conditioned Keyphasor signals to the backplane of the
3500 rack for use by other monitors. Therefore, you don't need
a separate Keyphasor module in the rack.
The 3500/50M Tachometer Module has a peak hold feature
that stores the highest speed, the highest reverse speed, or
the number of reverse rotations that the machine has
reached. You can reset the peak values
The 3500/50M Tachometer
Module supports 1 to 255
events per revolution for
Rotor Acceleration and Zero
Speed channel types.
All other channel types
support 0.0039 to 255 events
per revolution.
All channel types support a
maximum full scale range of
99,999 rpm and a maximum
input frequency of 20 kHz.
Minimum input frequency for
proximity transducers is
0.0167 Hz (1 rpm for 1 event
per revolution).
Minimum input frequency for
passive magnetic pickups is
3.3 Hz.
RPM Accuracy
Less than 100 rpm = ± 0.1 rpm
100 to 10,000 rpm = ±1 rpm
10,000 to 99,999 rpm = ±
0.01% of true shaft speed
