Sensor block Part C VC-6000
TM
Compact monitor
© VC-6000
TM
Compact monitor Sept.2011 C100583.002 Components Vers. 07 - 9 -
Maximum set-points for AS sensors:
The input signal is automatically integrated by the application if an
acceleration sensor is used to monitor the vibration speed. The
maximum <input range> is limited to 300 mm/s in this configuration.
Advice for setting the input range:
A small input range can improve the quality of the measurement result
(signal interruption span), but on the other hand will increase the risk of over-
ranging the input electronics. If the input range is too small this can lead to a
loss of the monitoring channel.
It should be noted that an existing damage to a machine will almost always
effect a rise in the maximum signal level. Especially in the case of
acceleration sensors, where in an extreme case the signal peak value can
rise by a factor 10 or more.
♦ <OK high> (OK-window, OK-LED)
This parameter gives the upper limit of the OK-window for the DC signal
path. The OK upper limit is always an absolute voltage value in the unit
[V] and can be changed within the setting range. If the sensor output
signal reaches an absolute voltage value higher than the OK upper limit
(e.g. from a break in the cable), a sensor OK fault will be signalled. The
works pre-settings should be changed with the greatest care, also in the
case of special reasons.
Setting range for the <OK-high>:
OK high Minimum: -21,5 V Maximum: + 2,5 V
♦ <OK low> (OK-window, OK-LED)
This parameter gives the lower limit of the OK-window for the DC signal
path. The OK lower limit is always an absolute voltage value in the unit
[V] and can be changed within the setting range. If the sensor output
signal reaches an absolute voltage value lower than the OK lower limit
(e.g. from a break in the cable), a sensor OK fault will be signalled. The
works pre-settings should be changed with the greatest care, also in the
case of special reasons.
Setting range for the <OK low>:
OK low Minimum: -21,5 V Maximum: + 2,5 V
Advice for setting the OK limits von Brüel & Kjaer Vibro
sensors :
VS-Sensor: OK high= 0 V
OK low = -20 V
SD/DS/IN-Sensor: OK high = -1.8 V
OK low = -18.2 V
AS-Sensor: OK high = -2,0 V
OK low = -18.0 V
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