Specifications

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Control Valves - SMARTLINK

MRV

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combustion systems for industry

Maxon reserves the right to alter specifications and data without prior notice.

10-30.7-72

E - i - 3/14

50120624-001/

Table 4: SMARTLINK

MRV Control Interface Terminal Descriptions

Table 4: SMARTLINK

MRV Control Interface Terminal Descriptions

Terminal Name (Abbreviation) Description

24V / Data Connector

Field 24VDC Power (F24+) Field (actuator) +24VDC power; 2, 3, & 4 Valve systems - 50, 75, 100 Watts (max), respectively

Field Common (F24-) Field (actuator) +24VDC common

Data A (DA) Input / Output: Communications network data ‘A’ signal

Data B (DB) Input / Output: Communications network data ‘B’ signal

Supply 24VDC (S24+) System power supply +24VDC; 2, 3, & 4 Valve systems - 53, 78, 103 Watts (max), respectively

Supply Common (S24-) System power supply common

4-20 mA Connector

4-20 mA In A+ (INA+)

Input: Isolated 4-20 mA firing rate command; current flows into INA+ and out of INA- terminal; 4 mA = 0% firing rate

demand (minimum valve positions); 20 mA = 100% firing rate demand (maximum valve positions)

4-20 mA In A- (INA-)

4-20 mA In B+ (INB+)

Input: Reserved for future use

4-20 mA In B- (INB-)

4-20 mA Out+ (OUT+) Output: Isolated 0-20 mA signal with current provided by the Control Interface, i.e. no external loop power supply is

required

During Run, Manual, or Shutdown Mode: Output represents firing rate feedback (actual); 4 mA=0% actual firing rate (min

positions); 20 mA=100% actual firing rate (max positions)

During Startup Mode: Output represents startup system status; 1 mA = all valves in standby positions; 2 mA = all valves

in purge positions; 3 mA = all valves in light-off positions

During Position Setup Mode: Output represents the actual position of the selected valve so that system commissioning is

possible using only a 4-20 mA meter; 4 mA = 0.0 degrees; 20 mA = 80.0 degrees; Actual valve position = [current (mA) -

4.0 mA] / 16.0 mA * 80.0 degrees

4-20 mA Out- (OUT-)

Relay Input Connector

The following relay inputs are solid-state and require 5-24VDC and 2 mA (max) to turn "ON".

Note #1: RI1 through RI6 must all be referenced to RCOM

Note #2: If the Control Interface is used with the MAXON Relay Input Interface (RII) module, the RI1-RI6 inputs below can

be connected to Relay Input Interface, terminals #6-#1.

Relay In 1 (RI1)

Input: The ON state of Relay Input #1 drives all SMARTLINK

MRV valves to their maximum or user-defined, custom

purge positions if either RI2 and RI3 are not ON.

Relay In 2 (RI2)

Input: The ON state of Relay Input #2 drives all SMARTLINK

MRV valves to their minimum or user-defined, custom light-

off positions if RI 3 is not ON.

Relay In 3 (RI3)

Input: The ON state of Relay Input #3 enables all SMARTLINK

MRV valves to synchronously modulate based on the 4-

20 mA firing rate command signal. When RI3 is ON, commands from either or both RI1 and RI2 inputs are overridden.

Relay In 4 (RI4)

Input: A momentary ON state of Relay Input #4 resets the MRV when a fault has occurred and the system is in Shutdown

Mode. (See page 10-30.7-66 for fault condition descriptions.)

Relay In 5 (RI5) Input: Relay Input #5 is reserved for future use.

Relay In 6 (RI6) Input: Relay Input #6 is reserved for future use.

Relay Output Connector

The following relay drive outputs are solid-state, 30VDC, 100 mA (max) open collectors.

Note #1: RO1 through RO5 must all be referenced to RCOM

Note #2: If the Control Interface is used with the MAXON Relay Output Interface (ROI) module, the following RO1-RO5

outputs can be directly connected to Relay Output Interface, terminals #1-#5.

Relay Out 1 (RO1)

Output: Relay drive Output #1 is turned ON if one or more MRV alarm or fault conditions exist. (See page 10-30.7-66 for

alarm/fault descriptions).

Relay Out 2 (RO2)

Output: Relay drive Output #2 is turned ON when no MRV system fault exists; RO2 is turned off when one or more

SMARTLINK

MRV "fault" conditions exist. (See page 10-30.7-66 for descriptions of fault conditions.)

WARNING: If the SMARTLINK

MRV system is purchased without a MAXON Relay Output Interface (ROI) module, it is

the commissioning engineer's responsibility to verify the wiring of RO2 (RO5 for systems with software version release

1C or later). Proper wiring of RO2 and its associated interface relay to the burner management equipment is an essential

safety requirement for burner shut down in the event of a SMARTLINK

MRV failure.

Relay Out 3 (RO3)

Output: Relay drive Output #3 is turned ON when all MRV valve positions are greater than or equal to their maximum

positions or user-defined, custom purge positions.

Relay Out 4 (RO4)

Output: Relay drive Output #4 is turned ON when all MRV valve positions are less than or equal to their minimum posi-

tions or user-defined, custom light-off positions.

Relay Out 5 (RO5)

Output: For systems with software version 1C or later, Relay drive Output #5 is turned ON when no MRV system fault

exists; RO5 is turned OFF when one or more SMARTLINK

MRV "fault" conditions exist. (See page 10-30.7-66 for

descriptions of fault conditions.)

WARNING: If the SMARTLINK

MRV system is purchased without a MAXON Relay Output Interface (ROI) module, it is

the commissioning engineer's responsibility to verify the wiring of RO5 (and RO2). Proper wiring of RO5 and its associ-

ated interface relay to the burner management equipment is an essential safety requirement for burner shut down in the

event of a SMARTLINK

MRV failure.