Description
Bearing Display Modules measures the shock pulse values of rolling bearings in dBsv on two channels
and converts the result to analog signals, 4-20 mA. The measuring range can be jumper set on the lower
circuit board to either 0 – 80 dBsv or to 20 – 100 dBsv. Via coaxial cables with TNC connectors, the BDM
modules are connected to shock pulse transducers of type SPM 40000 (BDM-40) or of type SPM 42000
(BDM-42). The modules are supplied with 12 to 24 V DC ±10%, source referred to earth.
The Bearing Display Modules have two relay outputs, 24 V/100 mA. The relays can be controlled by
either input channel. When using one input channel ('r 1' mode), both relays are slaved to that channel
and provide relay switching at two levels (ALERT and ALARM). When using two input channels ('r 2'
mode), each channel uses one relay which switches at the ALARM level.
Measured quantities and ranges are selected from a list of 13 programs. The user can add 7 own
programs. Programmable parameters for each input channel are the measuring range, the two alarm
levels ALERT and ALARM, and the time delay for each. The user also selects the relay mode and either
manual or automatic reset of ALARM. These parameters are input with two push-buttons.
Status display is provided by three coloured LEDs. The green LED is on while measured values are below
the ALERT level. Measured values between ALERT and ALARM on either channel trigger a yellow LED,
and a red LED lights up when a measured value exceeds one of the ALARM levels. A blinking yellow LED
indicates a system fault (incoming signal below 4 mA).
The measured value is displayed with two digits. In 'two channel mode', the status LEDs and the display
alternate between the two channels. The display shows the channel number followed by the measured
value on this channel.
The display modules can be connected to the analog input (4-20 mA analog signals) and the digital input
(relays) of a PLC.
DC supply 12 to 24 V,
source referred to earth
Yellow on = ALERT
Yellow blinking = system fault
Red on = ALARM
Red blinking = ALARM and
system fault
Green on = power on,
no alarm
Value display
Control buttons
Relay 2
Relay 1
Measurement unit
stickers
Channel 1 Channel 2
Jumper for measuring range setting Jumper for TLT OFF
Installation of Bearing Display Modules BDM
SPM Instrument AB • Box 504 • SE-645 25 Strängnäs • Sweden
Technical data are subject to change without notice.
Tel +46 152 22500 • Fax +46 152 15075 • info@spminstrument.se • www.spminstrument.com
ISO 9001 certified. © SPM 2004-04. 71748.B
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