Pressura RPM10 Operation And Service Manual page 77

Symptom Possible Cause
Positive/ Incorrect wiring.
negative/
neutral key
Inputs not
switch does not
configured for
work.
key switch
Defective switch
/ defective DIM.
DIM does not Network
respond to protocol is
network incorrect.
communications.
Incorrect
network
address.
Incorrect MAC
ID (BACnet
MS/TP only)
Incorrect baud
rate (BACnet
MS/TP only)
Incorrect
polarity.
Incompatible
software.
LonWorks
board not
installed.
Bad LonWorks
board.
Foreign network
acquired
monitor.
(LonWorks
only)
Technical Section
Corrective Action
Verify wiring is correct between key switch and DIM.
Go to Configure menu, Input 5 item (for Room 1 key switch)
or Input 7 item (for Room 2 key switch). Verify item is set to
Room 1 Key Switch or Room 2 Key Switch.
Go into DIAGNOSTICS menu, VIEW INPUTS item.
Key Switch inputs should read negative in negative position,
positive in positive position, and no isolation in neutral
position. If display changes correctly, switch and switch
input is good. If display does not change:
Disconnect key switch wires from Input 4, pins 17 & 18 for
Room 1, or Input 7, pins 23 and 24 for Room 2. Measure
the resistance of the switch:

Negative position should be open (infinite).

Neutral position should read approximately 273 kOhms.

Positive position should be closed (short).
If room mode is correct and resistance check is good, DIM
key input is probably defective. Replace DIM.
Go into INTERFACE menu, COMM TYPE item. The
protocol must match host system. Select correct interface.
The network address at the building automation system and
at the DIM must match. The network address must be
unique for each DIM.
The MAC ID and network address at the building
automation system and at the DIM must match. The
MAC ID and network Address must be unique for each
DIM.
The baud rate of the building automation system and the
DIM must match. Reset the BAUD RATE item in the
Interface menu to match the building automation system.
Verify and/or change polarity of RS-485 A and B wires.
Data sent to DIM may be in form that the monitor cannot
recognize.
®
Contact factory for further assistance.
®
Contact factory for assistance.
Go into Interface 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 PresSura monitor's
authentication key, allowing the SERVICE PIN to install or
reclaim the PresSura monitor to the LonWorks
®
network.
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