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microKool Portable Chillers UGH004/0999
6-10 TROUBLESHOOTING
WARNING
ALARMS
Alarm
The actual temper-
ature of fluid sup-
plied to the process
is lower than the
setpoint deviation
limit allows.
The actual temper-
ature of fluid sup-
plied to the process
is higher than the
setpoint deviation
allows.
The SPI communi-
cation link has
failed.
Possible cause
Is the low deviation tem-
perature set too low?
Is the low deviation tem-
perature set too high?
Has the process fluid
stopped flowing between
outlet and inlet?
Is the unloader valve
stuck open?
Is the unit connected to a
host machine?
Are the network address
and baud rate correct?
Is something wrong with
the cable?
Solution
Increase the low deviation
limit setting. The recommend-
ed setting is 2° F to 10° F
below the process setpoint.
Increase the high deviation
limit setting. The recommend-
ed setting is 2° F to 10° F
above the process setpoint.
Check for plugged pipes and
closed valves. Clear any
obstructions and open valves.
See
C
HECKING THE
U
NLOADER
V
ALVE
.
If the chiller is not connected
to a host device, set the SPI
address to OFF.
❒ Check the network address.
The address may be set to
any number from 32 to 254
(a hexadecimal integer
between 20 and FE), as long
as that number has not been
assigned to another machine
on the same network.
❒ Make sure the baud rate
(9600, 4800, 2400, or 1200)
matches the host machine.
Check the communication
cable condition and connec-
tions. The cable must conform
to SPI standards.
Low Deviation
High Deviation
The chiller has detected a problem that could lead to a shut down
condition if it is not corrected.
◆ The Alarm LED lights.
◆ The chiller continues operating.
◆ The control displays a red LED or alarm code indicating the
source of the problem.
SPI Communication