Technical Section
DIM does not
respond to
network
communications/
Network protocol
is incorrect.
Go into INTERFACE menu, NET PROTOCOL item. The
protocol must match host system. Select correct interface.
Incorrect network
address.
The network address at the building automation system
and at the DIM must match. The network address must
be unique for each DIM.
Verify and/or change polarity of RS-485 A and B wires.
Data sent to DIM may be in form that the controller cannot
recognize.
LonWorks
®
or
BACnet
®
board
not installed.
Contact factory for further assistance.
Bad LonWorks
®
or BACnet
®
board.
Contact factory for assistance.
Foreign network
acquired
controller.
(LonWorks
®
only)
Go into CONFIGURE menu, LON item. Select GO
UNCONFIG option, press the SELECT key. Return to the
LON item, select the SERVICE PIN option and press the
SELECT key. Selecting GO UNCONFIG will reset the
FHC50’s authentication key, allowing the SERVICE PIN
to install or reclaim the FHC50 to the LonWorks
®
network.
Alarm relays do
not work.
Enter the Set Points menu. Verify that the alarm that is
supposed to trigger the relay is not set to 0 (OFF). If the
alarm set point is zero, alarm relay is not active, so relay
will not be required to change state.
Check the wiring from DIM relay's output to the device
that is connected to the relays.
Disconnect the wiring (6-pin connector) from relay contact
pins 1 and 2 for low alarm relay and pins 3 and 4 for relay
“B”. Go into DIAGNOSTICS menu, ALARM RELAY A or
ALARM RELAY B. Connect an ohm-meter to relay
terminals to verify contact open and closes. Press the
/ key to manually trip the relay. If relay responds
(contact opens and closes), the device connected is
incompatible or defective. If relay does not respond, relay
is defective (may be caused by incompatible device).
Replace DIM.
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