Specifications

Control Valves - SMARTLINK
®
MRV
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combustion systems for industry
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Table 13: SMARTLINK
®
MRV User Commands - Command Set ‘B’
Table 13: SMARTLINK
®
MRV User Commands - Command Set ‘B’
SMARTLINK
®
Commands
Number: Name
Description of command purpose and usage
Command Set ‘B’
B-0: Select Loss of Signal (LOS)
Position
Command B-0 is a configuration command that permits selection of firing rate when a loss of signal event occurs. (A loss of sig-
nal condition exists if the 4-20 mA firing rate command signal drops below 0.05 mA). After Command B-0 is entered, the current
configuration is shown by one of the numbered lights. Select an L.O.S. configuration, #0,1,2,3, or 4, using the INC/DEC switch
and push the Enter button after the desired configuration is selected and indicated by the numbered lights.
Configuration #0,1,2, and 3 correspond to the positions defined at index #0, 3, 6, and 9 (max), respectively. Configuration #4 cor-
responds to no position change (actuator remains in the last firing rate position before loss of signal). The factory default configu-
ration is #0, position index #0.
B-1: Set Purge Position
Command B-1 is used to set a custom purge position that is independent of the maximum position required for high fire burner
operation. In most applications, this command is not required because the maximum position established for each valve at high
fire is acceptable during the purge period. (If this command is not used, purge positions will be set to the same values as stored
for position index #9.)
Prior to executing this command, the system must be in Startup Mode (i.e. Modulate Valve Command input of the MRV Interface
Panel is in OFF state) and the system's Startup Configuration must be set to "Custom". (See Command B-4 for Startup Configu-
ration.) In addition, Command A-3 must also be executed prior to Command B-1 execution in order to verify and/or change the
valve being selected for adjustment. When Command B-1 is executed, the system will enter Position Setup Mode to allow user
modification of the purge position (index #10) of the selected valve. If the numbered lights flash momentarily after entering Com-
mand B-1, the command was not executed for one or more of the following reasons:·
- The system is currently in RUN mode (i.e., the Modulate Valves command is energized),
- The ADJUST switch is the MINIMUM position,
- The system is in Shutdown Mode, or
- The system is "locked" to prevent tampering.
After successfully entering Command B-1, both the yellow manual light and green run light on the Control Interface will be flashing
along with numbered lights 9, 0, and 1. The flashing lights indicate that the purge position index can now be modified using the
INC/DEC switch. With the ADJUST switch in the ADJ position, pushing the INC/DEC switch up or down changes the position of
the "selected" valve in 0.1 degree steps. (A valve is "selected" by using Command A-3, Display/Change Selected Valve). If the
INC/DEC switch is held in the up or down position for more than 3 seconds, the valve position is changed in 0.5 degree steps.
After moving the valve to the desired position, the Enter button must be pressed to save the position setting. When the Enter but-
ton is pressed, the blinking position index lights (0-9) and command set light 'a' will momentarily turn off.
In the Position Setup Mode a maximum movement of 8 degrees from the stored position is permitted. When the 8 degree limit or
the min/max travel of the valve is reached, all of the position index lights will momentarily flash on. If the ADJUST switch is in the
INDEX position, valve positioning is inhibited and is indicated by a momentary flash of the position index lights when an INC/DEC
adjustment is attempted. When the system is in Position Setup Mode, the actual valve position is provided as a 4-20 mA output
signal on the OUT+/- terminals of the Control Interface. If a User Display is not purchased, this output can be measured and
recorded in the MRV Commissioning Table (Reference Table 16) as an indication of the positions stored in the Control Interface.
B-2: Set Standby Position
Command B-2 is used to set a custom standby position that is independent of the minimum position required for low fire burner
operation. In most applications, this command is not required because the minimum position established for each valve at low fire
is acceptable during the standby period. (If this command is not used, standby positions will be set to the same values as stored
for position index #0.)
After successfully entering Command B-1, both the yellow manual light and green run light on the Control Interface will be flashing
along with numbered lights 9 and 0. Adjustment of the standby positions and the requirements for entering the command are
identical to Command B-1, Set Purge Positions, described above.
B-3: Select Deadband
Command B-3 is a configuration command that is used to select the deadband placed around the firing rate command input sig-
nal. If the input signal contains spurious noise, hunting of the actuators may occur. It is recommended that the source of the
noise is eliminated or the 4-20 mA cable type is verified as well as its shield and ground connections. If the noise cannot be elim-
inated, the deadband can be increased as a last resort.
After Command B-3 is entered, the current configuration is shown by one of the numbered lights. Select a deadband configura-
tion, #0-5, using the INC/DEC switch and push the Enter button after the desired configuration is selected and indicated by the
numbered lights. Configuration #0,1,2,3,4 and 5 correspond to a deadband of 0, 0.03, 0.06, 0.13, 0.16%, respectively. The fac-
tory default configuration is #2, 0.06%.