Thermcraft XST-6-0-36-3V - Manual (Page 260)

Load Current Monitoring and Diagnostics Installation and Operation Handbook
8-4 2416 Controller
8.2.4 How Heater Alarms Are Displayed
Do This This Is The Display You Should See Additional Notes
If an alarm is
present it will flash a
four character
mnemonic in the
lower display If more than one
alarm is active, the
display will alternate
between the alarm
messages and the
default parameter in
the lower display
The Alarm Messages are:-
Mnemonic Meaning Description
The following two messages are alarms which are produced as a result of failure within the
process. In place of dashes the alarm number will appear i.e
1, 2, 3, or 4
-LCr Alarm number
- Low Current Used for partial load failure detection. To avoid nuisance
tripping due to supply voltage variations set to a value at
least 15% below the minimum normal operating current
-HCr Alarm number
- High Current Used for load overcurrent protection. To avoid nuisance
tripping due to supply voltage variations set to a value at
least 15% above the maximum normal operating current.
Note: This alarm is not intended to provide
instantaneous safety protection from short circuit fault
conditions
The following message is a diagnostic alarm which appears for mode 1 operation only.
LdF Load Fail This includes failure of the heater circuit or the SSR
The following two messages are diagnostic alarms produced as a result of failure within the
equipment or wiring connections. They appear for modes 2 and 5 operation only. They may
be enabled using the
diAG parameter in the AL LiSt, see ‘SHORT CIRCUIT SSR
ALARM AND HEATER FAIL ALARM’
Htr.F Heater Fail No current is being drawn while the controller output
demand signal is on
SSr.F SSR Fail The load is continuously on while the controller output
demand signal is off
Actual
Temperature
(PV)
HOME Display
20.0
1LCr
OP1 OP2