Honeywell HPM Service page 413

With the DIR/REV switch in the REV position, 20 mA equals 0% and 4 mA equals 100%. The INC
position of the INC/DEC switch will decrease current and the DEC position will increase current.
Standby Manual device control procedure
Use the HPM Status display to save the Checkpoint for the IOP, and then use the procedure in the
following table to provide Standby Manual device control of the FTA field devices.
Step
1
Be sure all the OUTPUT SOURCE SELECT switches are in the PM position.
2
Place the DIR/REV switches in the correct position for all eight channels.
3
Connect a standard IOP to FTA cable between the STANDBY MANUAL connector on
the FTA and the AOSM.
4
Verify that all OUTPUT SOURCE SELECT switches are in the PM position.
5
The BALANCE switch has three positions, left (CONT), center (inactive), and right
(PUSH TO BALANCE). Select the left or right position.
CONT Position
In the CONTinuous (left) position, the switch remains toggled and all the channels with
their OUTPUT SOURCE SELECT switch in the PM position will automatically have
their Standby Manual device output level continuously set equal to the IOP level.
Manual INCrement and DECrement control for a channel is not possible when a
channel is in the PM position while the BALANCE switch is in the CONT position.
PM Position
In the PUSH TO BALANCE (right) position, the position is momentary and all channels
with their OUTPUT SOURCE SELECT switch in the PM position will automatically have
their Standby Manual device output level set equal to the IOP output level. However,
this balance method is a single event and the switch returns to the center position when
it is released. Any subsequent change in the IOP's output level will not be transferred to
the Standby Manual, but the INCrement and DECrement control for a channel can alter
the Standby Manual device's current level.
6
The STANDBY ENABLE switch can now be depressed. The green LED illuminates to
indicate that the FTA is now ready for control by the Standby Manual device.
7
Placing any or all of the OUTPUT SOURCE SELECT switches in the MANual position
will automatically place all eight IOP channels in the Standby Manual mode.
8
When all eight OUTPUT SOURCE SELECT switches are in their MANual position, the
Analog Output IOP can be placed in the Idle state and removed.
R688
December 2020
HPM High-Performance Process Manager Service
Honeywell
6 Removal and Replacement
6.5 AO Standby Manual Device Operation
Action
413