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5.2.4.7 Failure Transfer
The controller will enter failure mode as one of the following conditions occurs.
1 SB1E Error occurs ( due to the input 1 sensor break or input 1 current below 1mA, if 4-
20mA is selected or input 1 voltage below 0.25V if 1-5 V is selected ), if PV1, P1-2 or
P2-1 is selected for PVMD or PV1 is selected for SPMD.
2 SB2E Error occurs ( due to the input 2 sensor break or input 2 current below 1mA,if 4-
20 mA is selected or input 2 voltage below 0.25V if 1-5 V is selected ), if PV2, P1-2 or
P2-1 is selected for PVMD or PV2 is selected for SPMD.
3 ADER Error occurs due to the A-D converter of the controller fails.
The output 1 and output 2 will perform the failure transfer function as one of the following conditions occurs.
1 During power starts (within 2.5 seconds).
2 The controller enters the failure mode.
3 The controller enters the manual mode.
4 The controller enters the calibration mode.
Output 1 Failure Transfer, if activated, will perform
1 If output 1 is configured as proportional control (PB1≠0), and BPLS 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 driven OFF
if O1FN selects REVR and be driven ON if O1FN selects DIRT.
4 If output 1 is configured as ON-OFF control (PB1=0), then output 1 will be driven 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 perform
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 O2FT will be used for controlling
output 2.
Alarm 1 Failure Transfer is activated as the controller enters failure mode. Thereafter the alarm 1 will
transfer to the ON or OFF state pre-set by A1FT.
Exception
If Loop Break (LB) alarm or sensor Break (SENB) alarm is configured for A1FN, the alarm 1 will
be switched to ON state independent of the setting of A1FT. If Dwell Timer (TIMR) is configured for A1FN,
the alarm 1 will not perform failure transfer.
Alarm 2 Failure Transfer is activated as the controller enters failure mode. Thereafter the alarm 2 will
transfer to the ON or OFF state pre-set by A2FT.Alarm 2 Failure Transfer is activated as the controller
enters failure mode.
Exception
If Loop Break (LB) alarm or sensor Break (SENB) alarm is configured for A2FN, the alarm 2 will
be switched to ON state independent of the setting of A2FT. If Dwell Timer (TIMR) is configured for A2FN,
the alarm 2 will not perform failure transfer.
5.2.4.8 Bumpless Transfer
The Bumpless transfer function is available for output 1 and output 2 (provided that OUT2 is
configured as COOL). Bumpless Transfer is enabled by selecting BPLS for O1FT and/or O2FT and
activated as one of the following cases occurs.
1 Power starts (within 2.5 seconds).
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