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Troubleshooting
Follow these general procedures if you can control the
MicroTech II chiller unit controller from the keypad/display, but
are not able to communicate with the unit from the network:
General
→ Confirm that the communication module is inserted
properly (see
Installation
→ Verify the unit controller is set up to communicate
Modbus using the keypad/display. Refer to the
Configuration
section or the MicroTech II Chiller Unit
Controller OM
(Reference
Network Parameters
→ Verify that the Network Address of the communication
module (slave) is unique in the network. In contrast, the
Baud Rate must match the other slave devices on the
network.
→ Make sure there are no duplicate devices on the
network and that Network Address and Baud Rate are
set correctly as shown in
Network wiring
If performance is unsatisfactory or network is experiencing
issues such as noise or slow transmission:
→ Confirm that the shield is landed at only one point in
the trunk.
→ Be aware that the recommended network topology is
daisy-chain (no T-Taps or ring layout).
→ Verify that network wiring does not exceed 4000
ft total distance limit (without repeaters) at 19200 bps
baud.
→ Verify that polarity is maintained.
→ Check that there are end-of-line termination resistors
(120 Ω) at the first and last device on the trunk. This is
required by the EIA-485 specification.
→ Verify that the network trunk avoids strong sources of
electromagnetic interference (EMI).
→ Note that the two-wire bus is not interchangeable and
must be connected correctly.
→ Verify that the network trunk is not located near a DC
load switch (relay).
www.DaikinApplied.com
section).
Network
Documents) for details.
Table 2.
Network Performance
→ If network traffic is slow, communication is
intermittent, or the trunk is experiencing "noise," it
may be necessary to use a network protocol analyzer
or oscilloscope to determine the source of poor
performance.
→ Confirm power is applied to the unit controller.
Contact the Daikin Applied Controls Customer Support group
at 866-462-7829 for additional assistance, if necessary.
Parts
Table 3: Replacement Parts List
Description
MicroTech II Modbus Communication Module kit
Kit includes: Modbus communication module (RS-485
serial network board), network connector, and IM 743
Network connector
Phoenix (shown in
Figure 12: Phoenix Network Connector
To find your local parts office, visit
call 800-37PARTS (800-377-2787
11
IM 743-7 • MICROTECH II CHILLER UNIT CONTROLLER
Parts and Service
Part Number
350147402
Wago
330803003
Figure
12)
910108485
www.DaikinApplied.com
Parts and Service
or