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3–16 Failure Transfer
The controller will enter failure mode if one of the following conditions occurs:
1. SB1E occurs (due to input 1 sensor break or input 1 current below 1mA if 4–
20mA is selected or input 1 voltage below 0.25V if 1–5V is selected) if PV1, P1-
2, or P2-1 is selected for PVMD or PV1 is selected for SPMD.
2. SB2E occurs (due to input 2 sensor break or input 2 current below 1mA if 4–
20mA is selected or input 2 voltage below 0.25V if 1–5V is selected) if PV2, P1-
2, or P2-1 is selected for PVMD or PV2 is selected for SPMD.
3. ADER occurs if the A-D converter of the controller fails.
Output 1 and output 2 will perform the failure transfer function as one of the fol-
lowing conditions occurs:
1. During power starts (within 2.5 seconds).
2. The controller enters failure mode.
3. The controller enters manual mode.
4. The controller enters calibration mode.
Output 1 failure transfer, if activated, will perform:
1. If output 1 is configured as proportional control (PB1≠0), and BPLS is selected
for O1FT, then output 1 will perform bumpless transfer. Thereafter, the previous
averaging value of MV1 will be used for controlling output 1.
2. If output 1 is configured as proportional control (PB1≠0), and a value of 0 to
100.0% is set for O1FT, then output 1 will perform failure transfer. Thereafter,
the value of O1FT will be used for controlling output 1.
3. If output 1 is configured as ON-OFF control (PB1≠0), then output 1 will be driv-
en OFF if O1FN selects REVR and be driven ON if O1FN selects DIRT.
Output 2 failure transfer, if activated,
will perform:
1. If OUT2 selects COOL, and BPLS is selected for O1FT, then output 2 will per-
form bumpless transfer. Thereafter, the previous averaging value of MV2 will be
used for controlling output 2.
2. If OUT2 selects COOL, and a value of 0 to 100.0% is set for O2FT, then output
2 will perform failure transfer. Thereafter, the value of O1FT will be used for
controlling output 2.
Alarm 1 failure transfer is activated as the controller enters failure mode.
Thereafter, alarm 1 will transfer to the ON or OFF state preset by A1FT.
Exception: If A1FN is configured for loop break (LB) alarm or sensor break
(SENB) alarm, alarm 1 will be switched to ON state independent of the setting of
A1FT. If A1FN is configured for dwell timer (TIMR), alarm 1 will not perform
failure transfer.
Alarm 2 failure transfer is activated as the controller enters failure mode.
Thereafter, alarm 2 will transfer to the ON or OFF state preset by A2FT.
Exception: If A2FN is configured for loop break (LB) alarm or sensor break
(SENB) alarm, alarm 2 will be switched to ON state independent of the setting of
A2FT. If A2FN is configured for dwell timer (TIMR), alarm 2 will not perform
failure transfer.
Failure mode occurs as:
1. SB1E
2. SB2E
3. ADER
Failure Transfer of output
1 and output 2 occurs as:
1. Power start (within 2.5 seconds)
2. Failure mode is activated
3. Manual mode is activated
4. Calibration mode is activated
Failure Transfer of alarm 1
and alarm 2 occurs as:
Failure mode is activated
Failure Transfer Setup:
1. O1FT
2. O2FT
3. A1FT
4. A2FT
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