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174 HVAC Drive H300
Issue Number: 3
10.2.4 Building automation network (BAN) protocol selection
Building automation network (BAN) protocol selection (Pr 29.001) selects the network protocol:
Table 10-7 BAN protocol
The following process should be followed to change the communication protocol:
1. Select the required protocol in Pr 29.001.
2. Perform a parameter save.
3. Power cycle the drive.
10.2.5 BACnet MS/TP Maximum Master MAC Address
(Pr 29.003) BACnet use only
This is highest address that the drive will use when looking for the next master on the network with which token passing can be achieved.
If a value greater than 127 is entered then the value used will be 127. The parameter value will change to 127 to reflect this.
10.2.6 Device Object Identifier
(Pr 29.004) BACnet use only
This number uniquely defines this device on the entire network.
10.2.7 Communications lost detection time-out period
Communications Lost Detection Time-Out Period (Pr 29.005) sets the period in seconds that the drive will wait to see a valid communications frame
on the network before taking the action specified in Communications Lost Action (Pr 29.006).
10.2.8 Communications lost action
Communications Lost Action (Pr 29.006) determines the drive action when communication is lost.
BACnet
The network is monitored for the presence of an active token; should this token disappear for the time specified, the drive will take the configured
action.
MetaSys
The network is monitored for any message. Receipt of a valid message (regardless of intended destination) will be seen as communications being
healthy. If no valid message is received within the time specified, the drive will take the configured action.
The following action is taken when loss of communication is recognized:
Table 10-8 Communications lost action
The move to fixed speed option will only operate if the drive is configured to use preset speed 1 as the reference at the time communications is lost.
Every time there is a transition from the communications healthy state to the communications lost state the reference value set in preset speed 8 will
be transferred to preset speed 1 causing the drive to run at the speed defined in preset speed 8.
The drive will continue to run at this speed until such time as the user manually changes preset speed 1 via the keypad or communications returns
and a new speed reference is provided via the building automation network
Pr 29.001 Protocol
0 Modbus RTU
1 BACnet MSTP
2 MetaSys N2 Open
Pr 29.006 Action Comment
0 Do nothing The drive will continue as it was before communications was lost
1 Trip the drive The drive will trip when communications is lost (sub trip 50)
2 Move to a fixed speed Preset speed 8 is used to define this speed, see below
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