Troubleshooting
www.DaikinApplied.com 13
IM 1005-3 • MICROTECH III REMOTE USER INTERFACE
Troubleshooting
This section contains helpful information, frequently asked
questions, and other tips related to the remote user interface.
General Troubleshooting
During the initial download sequence, the keypad/display
appears to freeze up and a "Loading......Lost Connection"
message appears.
Solution
The remote user interface is stuck in the downloading
sequence due to incompatibility with v1.07 application
software. The remote user interface must be updated
to v10.22 or newer application software. Contact Daikin
Applied Air Technical Response at 844-521-3928 for further
instructions.
Problem
The remote user interface is experiencing a loss of
communication.
Solution
The site may have "dirty power" or electrical noise causing
loss of communication.
1. Access the Power Bus menu on the MicroTech III
unit controller by the following keypad menu path:
service menu/HMI setup/PBusPwrSply=ON (default).
See
Figure 13.
2. Set the default Power Bus supply.
a.
For the first and last units on the daisy-chain
trunk, leave the Power Bus supply at the default
of ON.
b. For all other units within the daisy chain trunk,
set the Power Bus supply to the OFF position.
Figure 13: Power Bus Menu
Problem
The remote user interface has been connected to the
MicroTech III unit controller but the display remains blank
after power-up.
Solution
Verify that the unit controller has power. Check wiring from
the unit controller to the remote user interface.
NOTE:
Inputs and outputs are polarity sensitive.
Frequently Asked Questions
1. Is a separate 24V power supply necessary for direct
connection?
→
No, power is provided by the MicroTech III unit
controller.
2. What type of cable is recommended for daisy-chain
connection?
→ Daikin Applied generally recommends using
twisted
pair, 16 AWG shielded cable up to 500 ft and 14 AWG
from 500 to 1000 ft. Contact the appropriate Technical
Response Center for applications requiring longer
distances.
How do I know if or when I need to upgrade the remote user
interface (HMI) firmware files?
→
If the remote user interface seems to freeze during
initial download process
→
If wiring has been confirmed (inputs and outputs are
polarity sensitive) and HMI is not responding
See
Firmware Upgrade Procedure
section for details.
What if I want to upgrade the MicroTech III unit controller
firmware?
→
Contact either the Daikin Applied Air
Technical Response Center at 844-521-3928
([email protected]) or the Chiller
Technical Response Center at 540-248-9239
([email protected]) for assistance.
Helpful Tips
Service technicians often find it convenient to have two
keypad/displays connected to a single unit controller. Using
a split-screen setup makes it possible to view multiple menu
items at the same time during start-up and also for diagnostic
purposes.
→
Simply hook up the first remote user interface with an
RJ45 direct connection, and then use a two-wire twisted
pair cable to connect to the second keypad/display.
