SPM Vibration BDM40A – Bearing Display Module 4-20 mA (For SPM transducer 40000)

• 2 channels with display, for transducer 40000
• Max. cable length: 4m
• Measure bearing condition on 2 channels, convert into analog 4-20 mA signal to be sent to a PLC
• Displays analog 4-20 mA signals as a 3 digit measured value

The CMM system is a permanently installed, continuous condition monitoring system, consisting of transducers, converters, and combined display and control modules.

The SPM Bearing Display Modules (BDM) have two functions:

• They measure bearing condition (un normalized maxi-mum value) on two channels and convert the result into an analog 4-20 mA signal which can be sent to a PLC.
• They display analog 4-20 mA signals as a 3 digit measured value. All units have two inputs for analog 4-20 mA, connected to the value display, the condition display and the alarm relays. The analog signal normally comes from the module’s measuring channels but can even come from external sources.

The two versions are:

• BDM40A for shock pulse transducer type 40000. The co-axial cable between transducer and module is max. 4m
• BDM42A for shock pulse transducer type 42000. The co-axial cable between transducer and module is max. 100m

The measuring range for both channels can be jumper set to either 0 to 80 or 20 to 100dBsv. The modules are wall mounted and supplied with 12 to 24 V DC. A transducer line fault is indicated by an output of ≤ 1 mA. This output can be disconnected by a jumper setting.

The display circuit acts as a programmable ampere meter with two channels. Using two push-buttons, one can select preprogrammed measuring units and ranges from a list and set two alarm levels (with alarm delay) for each channel. These are connected to the condition display (green/yellow /red) and to two relay outputs. The relays can be controlled by either display channel. In one channel mode, both relays are slaved to a single display channel and provide relay switching at two levels (ALERT and ALARM). In two channel mode, each display channel uses one relay which switches at the ALARM level.