Technical manual
KANMED Operatherm OP3
Page
21
of
34
8 TROUBLE SHOOTING
Function Supervision and Alarms
Apart from a complete self test when the system is turned on, (where all vital parts and safety
functions are being tested), the Operatherm OP3 supervises the function of the system during
normal operation and will render alarm or alert for any of the following fault conditions:
•
Incorrect temperature (e.g. high or low temperature alarm)
•
Heating Pad error (defective Heating Pad or to much energy being fed to the Pad)
•
Control Unit error (internal error detected).
•
Power Failure. (In case of a mains power failure, the Operatherm alarms by flashing the power
indication LED and sounding the beeper intermittently. The power failure alarm is kept active
for at least 10 min. The power alarm can be silenced by the operator by pressing the on/off
button for about 2 seconds).
For added safety against over-temperature due to electrical short circuits, multi fault conditions or
similar unforeseen general errors in the Control Unit, each of the OP3 series Heating Pads has its
own, completely independent safety circuit located in the Heating Pad connector. This circuit
monitors the feeding voltage to each of the eight elements in the Heating Pad at all times and if an
error is detected, it will cause the Control Unit to cut the power feed to the Heating Pad (trip the
safety relay). Two different conditions will cause the safety circuit to activate:
1. If this circuit detects an unregulated voltage being fed to any of the elements (e.g. a major error
in the Control Unit causing short circuit output).
2. If the Control Unit is feeding more energy than 25000 Ws over a period of 30 minutes to any of
the elements, e.g. error in the temperature regulation – or an abnormally high thermal load.
In case the Operatherm OP3 indicates an alarm, note the error code indicated (see explanation of
the codes further down in this section). If there is a logical explanation, try to eliminate the
condition that is causing the alarm. Restart the unit and observe a correctly executed self test. In
case the alarm comes back without apparent reason, the unit must be fully examined by a qualified
technician.
Note
: If the mains power is removed before the Control Unit is set to standby, or the on/off button is
unintentionally pressed when the main power is not connected, the alarm will start! This “false” alarm is reset
by simply pressing the on/off button for about 2 seconds.
Alerts
Informative system messages only, the system will continue operation.
Alert display
and Error Code
Description / Operator actions
Slow cooling.
The Heating Pad has a higher temperature than the Control Units
set temperature. The status bar displays a thermometer-icon as long as this
condition persists.
Action
:
No action normally required. This alert might occur when the set
temperature is reduced from a higher setting.
Slow heating
. One or more of the Pad elements has not reached 2°C less than
the set value after 10 minutes.
Action
:
No action normally required. This alert might occur when the unit starts
from a cold condition. If the system is re-started, a new 10 minutes power boost
period will occur and help the system to faster reach the set temperature.
Defective elements
. A Heating Pad with one or two defective elements has been
connected to the Control Unit.
Action
:
Reset the alert. The Pad may be used but should be replaced by a correct
Pad at earliest opportunity
.
