9
Installation of Bearing Display Module BDM
Relay action in two channel mode
The relays are specified 24 V/100 mA. In 'two channel mode', the user can select one of three alternative
relay modes.
ALARM
red LED on
ALERT (no power)
yellow LED on
OK
green LED on
Relay mode 'r 1'
In two channel mode, the module receives analog signals on both channel 1 and channel 2. Two alarm
levels can be programmed for each channel (see page 8). Relay mode 'r 1' implies, that both relays are
slaved to the channel with the higher alarm status.
The mode is set by selecting 'r 1' when programming.
This overrides the NC/NO setting in the program.
Level 1 = ALERT = yellow LED is connected to Relay 1.
Relay 1 is NC = normally closed. It opens on power
failure and on alarm (value above the lower or ALERT
alarm level). Thus, it will be open when the yellow or
the red status LED is on.
The alarm level 2 = ALARM = red LED is connected to
Relay 2. Relay 2 is NO = normally open. It closes on
ALARM = red status LED is on.
Relay mode 'r 2'
Relay mode 'r 2' implies, that relay 1 is slaved to channel 1 and relay 2 is slaved to
channel 2. The relays act on ALARM = red status LED is on. Thus there is no relay action
on power failure or yellow ALERT.
Relay action is program selected and set to either NO or NC. Thus, there are two alternatives:
ALARM channel 1 + 2
red LED on
ALARM channel 1
red LED on
ALARM channel 2
red LED on
OK / ALERT
green LED on
Mode 'r 2' + 'rn0'
NO (normally open)
ALARM channel 1 + 2
red LED on
ALARM channel 1
red LED on
ALARM channel 2
red LED on
OK / ALERT
green LED on
Mode 'r 2' + 'rnC'
NC (normally closed)
NO
NO
NC
NC
NC
NO
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