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GFK-0121E
Hand-held Monitor User’s Guide – June 1994
Monitor/Control Reference Display for an Analog, RTD, or Thermocouple Block
For an analog, RTD, or Thermocouple block, the
Monitor/Control Reference screen shows the
current value for each circuit. For example:
M N T R (ckt. reference) A
I 2 : – 1 9 3 7
N O F A U L T S
> f o r c e r e l e s
O
For an analog block, the values may represent
either engineering units or unscaled analog data.
For an RTD or Thermocouple block, the values
represent tenths of degrees (Celsius or
Fahrenheit), tenths of ohms, or unconverted
counts.
Press F1 ( > ) to display other circuits.
Forcing an Analog, RTD, or Thermocouple
Value
The HHM’s circuit forcing capability must be
enabled to perform this function.
1. Press F2 (Force) to force the displayed circuit.
2. If you make a mistake entering a value, use the
Clear key to delete one digit at a time, starting
with the last. To exit without forcing a circuit,
press F2 (Change).
3. Press F3 (Enter) to save this value as the value
for the circuit. The forced value will remain
until you press F4 (reles), or enter a new value.
Diagnostics
Line 3 shows whether the circuit has any faults. If
it does, one of these messages appears on line 3:
Feedback error: There is a wiring error or other
hardware fault on a Current-source Ana-
log block. The output’s actual current dif-
fers from the commanded current by
more than 250mA.
High alarm/low alarm: An analog input value ex-
ceeds its high or low alarm limit.
Input shorted: An RTD input circuit measurement
is less than expected for the RTD type.
Internal fault: Internal calibration readings for a
pair of RTD circuits are out of tolerance.
Open wire: On an RTD block, the RTD is missing
or faulty, or there is an open wire. On an
analog block, an input configured for 4 to
20mA has less than 2mA present.
Overrange/underrange: An analog or RTD circuit
exceeds its maximum value.
Overtemperature: The block’s internal tempera-
ture exceeds 100 C.
Wiring error: There is a faulty connection be-
tween an RTD and the block.
Clearing Circuit Faults
After correcting a fault condition, press the CLEAR
key to remove the message and restore the
reference to normal operation (the Clear Block
Faults function must be enabled to use this
feature). If the fault condition still exists, the fault
message will reappear.