Specifications

Control Valves - SMARTLINK
®
MRV
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combustion systems for industry
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10-30.7-81
E-i -3/14
50120624-001/
Table 12: SMARTLINK
®
MRV User Commands - Command Set ‘A’ (continued)
SMARTLINK
®
Commands
Number: Name
Description of command purpose and usage
Command Set ‘A’
A-4: Commission Valve
Command A-4 "commissions" the selected valve and stores the position index (at the time of command entry) as the valve's
maximum "running" position index. Prior to executing A-4, Command A-3 must be performed to verify and/or change the valve
being selected for commissioning. After Command A-2 (Position Set-up Mode) and Command A-4 are executed for each of the
installed valves, the system will follow the 4-20 mA firing rate when the Modulate Valves input is energized on the MRV Interface
Panel (i.e. RI3 of the Control Interface is in the ON state). If a valve is not commissioned, the system will remain at its light-off
positions when modulation is commanded but will indicate an alarm for each non-commissioned valve. The maximum "running"
position index permitted for a commissioned system is the minimum "running" index of the installed valves. The maximum "run-
ning" index permits partial commissioning when the lack of a full system load prevents firing the burner to its required capacity.
Therefore, if the user desires operation at position index #9 for maximum application capacity, Command A-4 must be executed
for each installed valve while the system is in Setup Mode and positioned at index #9.
Command A-4 is also used to re-commission a valve when its actuator is replaced. (See page 10-30.7-68 for instructions on how
to mechanically replace a valve actuator.) When re-commissioning a spare actuator, the valve number being replaced (#0, 1, 2,
or 3) must be selected with Command A-3 and the replacement actuator must be powered and connected to the control network.
When Command A-4 is executed for re-commissioning, the identification number of the spare valve actuator is saved in the Con-
trol Interface and the number of the valve being replaced is saved in the spare actuator. After re-commissioning the spare actua-
tor, the valve should be re-calibrated by MAXON-trained personnel (see Commands C-1 and C-2) and the system must be re-
powered or reset (using the Remote Reset input or the User Display). Then the burner can be re-lit and the MRV will modulate
based on the 4-20 mA firing rate when commanded. Due to mechanical tolerances, the direct mounting of the replacement actu-
ator will change the position of the valve by less than 1 degree. Burner operation should be re-verified after actuator replacement
if a 1 degree change in absolute valve position could affect burner performance. If an actuator is replaced without executing
Command A-4 for valve re-commissioning, a valve "swap" alarm will be indicated and the system will not modulate based on the
4-20 mA firing rate when commanded.
If the numbered lights flash momentarily after entering Command A-4, the command was not executed for one or more of the fol-
lowing reasons:
- The ADJUST switch may be in the MINIMUM position,
- The system is not in Position Setup Mode (or in Shutdown Mode for actuator re-commissioning),
- The system may be "locked" to prevent tampering, or
- The replacement valve is not connected to the system when re-commissioning a spare actuator.
A-5: Set Max Position &
Min/Max Ramp
Command A-5 is used to enter the Valve Position Setup Mode for adjusting the maximum position (index #9 of the selected
valve) and setting a linear position ramp from the minimum to maximum stored positions. If the numbered lights flash momen-
tarily after command entry, the command was not executed for one or more of the following reasons:
- The system is not currently at position index #9,
- The ADJUST switch may be in the MINIMUM position,
- The system is in Shutdown Mode, or
- The system may be "locked" to prevent tampering.
After entering the command successfully, both the yellow manual light and green run light will be flashing (indicating Position
Setup Mode) along with a flashing #9 light. The selected valve's maximum position can now be modified using the INC/DEC
switch. If the ADJUST switch is in the ADJ position, pushing the INC/DEC switch up or down changes the valve position in +/-0.1
degree steps. 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 button is pressed, the #9 position index light and the command set light 'a' will momentarily turn off. Prior to exe-
cuting Command A-5, Command A-3 must be performed to verify and/or change the valve being selected for adjustment.
In the Position Setup Mode a maximum movement of 8 degrees from the stored position is permitted. When the 8 degree limit or
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 Sheet (Reference Table 16) as an indication of the positions stored in the Control Interface.
A-6: Set Min Position & Min/Max
Ramp
Command A-6 is used to enter the Valve Position Setup Mode for adjusting the minimum position (index #0 of the selected valve)
and setting a linear position ramp from the minimum to maximum positions. To enter Command A-6, the position of the system
must be at index #0. Adjustment of the minimum position is performed identical to adjustment of the maximum position, Com-
mand A-5.
A-7: Unlock Valve Configuration
Command A-7 permits entry of a 4-digit passcode to "unlock" the system configuration and position profile for user modification.
A flashing alarm light indicates a "locked" unit. If the alarm light is not flashing, the unit is already unlocked and the numbered
lights will flash momentarily if command entry is attempted. After the command is entered, the INC/DEC command is used to
select a passcode digit as indicated by the lights. Once selected, the Enter button should be pushed and the process repeated 3
more times. If the 4-digit passcode is correct, the alarm light will stop flashing and be turned off if no other alarms exist. To re-
lock the unit, move the command switch to the RUN position.