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How to

How to


Products: MP-V
Functionalities: Hardware
Product version: 3.3, 2022
7/23/2021

Powering Up MP-V

You perform the following steps to power up MP-V.

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The MP-V incorporates an integral actuator and the device is designed for over-the-shaft damper installation.

 
action_zoom_plus_stroke MP-V installed over the damper shaft

MP-V installed over the damper shaft

The MP-V can be used with dampers that are opened in clockwise (CW) position as well as dampers opened in counter-clockwise (CCW) position. You use WorkStation or the Commission mobile application to configure the MP-V actuator direction of rotation accordingly.

 
action_zoom_plus_stroke MP-V components

MP-V components

The MP-V is typically installed with the air flow sensor barbed fittings pointing down (orientation B in the figure below). The MP-V can also be installed with the barbed fittings pointing left (A), right (C), or up (D).

 
action_zoom_plus_stroke Supported installation orientations

Supported installation orientations

With a downward extension, the available area around the damper shaft must measure:

  • 160 mm (6 inches) down from the lower edge of the shaft,

  • 120 mm (4.5 inches) to the right,

  • 45 mm (1.75 inches) to the left, and

  • 45 mm (1.75 inches) above the shaft.

Ensure that the location allows enough clearance for servicing.

The MP-V actuator is designed to be installed over a 12.7 mm (0.5 inch) diameter round damper shaft with a minimum of 54 mm (2.125 inches) exposed damper shaft length.

When the damper shaft diameter is less than 12.7 mm (0.5 inch), an adapter is required. An adapter with part number AM-135 can be ordered from Schneider Electric to enable installation on a 9.5 mm (0.375 inches) diameter damper shaft.

 
action_zoom_plus_stroke AM-135 damper shaft adapter

AM-135 damper shaft adapter

Important:

The cutout section of the shaft adapter must be positioned such that the damper shaft mounting screws are tightened against the damper shaft and not the adapter cylinder.

When the exposed damper shaft length is less than 54 mm (2.125 inches) but greater than 22.2 mm (0.875 inch), you move the damper shaft mounting screws from the actuator collar to the alternative screw holes on the MP-V actuator.

 
action_zoom_plus_stroke Alternative position of the mounting screws for shorter damper shaft lengths

Alternative position of the mounting screws for shorter damper shaft lengths

The MP-V also has two mounting brackets, which allow you to choose the mounting bracket that best accomodates the available access space in the VAV mounting area. You position the anti-rotation clip in the desired mounting bracket.

 
action_zoom_plus_stroke Two mounting brackets

Two mounting brackets

The MP-V onboard air flow sensor is connected to an air velocity probe in the VAV box using two tubes. A dip in the tubing helps prevent moisture from entering the MP-V and damaging the air flow sensor. The dip should extend below the elevation of the barbed fittings. This applies to all MP-V orientations, but especially C and D.

 
action_zoom_plus_stroke Tubing dip

Tubing dip

The MP-V is delivered with terminal blocks installed on the device. Spare terminal blocks can be ordered separately using the part number SXWMPVCON10001.

The terminal blocks are removable. You can quickly and easily replace an MP-V because no terminal wiring is affected.

When the MP-V is powered up for the first time, the MP-V software automatically performs an actuator travel and damper position calibration. The calibration operation drives the damper actuator in the close direction and registers the position when the actuator encounters the stop. The software then drives the actuator in the open direction and registers the position when the stop is encountered. The software uses that information to scale the 0 to 100% span. Mechanical obstructions hindering the damper actuator rotation during the calibration process can adversely affect the calibration results and thus the VAV damper operation. In that case, you can manually run a recalibration. For more information, see Configuring a Damper Command .

Important:

Initial calibration of actuator travel and damper position is performed automatically when the MP-V is powered up for the first time. If you subsequently press the manual override button, you must recalibrate the MP-V manually. For more information, see Configuring a Damper Command .

Notice

VAV DAMPER NOT PROPERLY CONTROLLED

  • Ensure that the MP-V is properly installed and secured prior to application of the 24 VAC power.

  • Ensure that the MP-V damper actuator can rotate freely between the fully open and fully closed positions.

Failure to follow these instructions can result in the VAV damper not being properly controlled by the MP-V.

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The MP-V has a built-in power supply designed to accommodate 24 VAC at 50/60 Hz input power.

The built-in power supply is based on a half-wave rectified, non-isolated design, which is complemented with electronic protection components for transient protection, overload protection, and EMC compliance.

To power the controller, use a Class 2 (EN 60742) transformer supplying a nominal 24 VAC at 50/60 Hz. For more information, see MP-V Controllers .

A separate, local 24 VAC step-down transformer is recommended to power each BACnet/IP device. The transformer with appropriate VA rating may also be used to power the locally connected I/O devices. The separate transformer helps to avoid problems with ground loops, 24 VAC induced EMI on LAN, low or distorted AC voltage level at the controller, and excess transformer load due to the half-wave power supply, which can result in intermittent equipment detected faults, loss of communications, or equipment damage.

Notice

EQUIPMENT DAMAGE

Use a separate, local 24 VAC step-down transformer to power each BACnet/IP device.

Failure to follow these instructions can result in equipment damage.

Notice

CONTROLLER DEVICE DAMAGE

Do not power the SpaceLogic device with a 24 VAC transformer that is used to power devices that contain non-isolated full-wave rectifier power supplies.

Failure to follow these instructions can result in equipment damage.

Notice

The MP-V must be properly installed and secured prior to application of the 24 VAC power. Failure to follow these instructions adversely affects the damper position calibration that the controller automatically runs after the first application of power.

The user may request a Recalibrate function later from the properties of the VAV damper object in the MP-V device using EcoStruxure Building Operation WorkStation (after communication is set up). For more information, see Configuring a Damper Command .

Notice

EQUIPMENT DAMAGE

Use a separate, local 24 VAC step-down transformer to power each BACnet/IP device.

Failure to follow these instructions can result in equipment damage.

To power up MP-V

  1. Ensure that the MP-V is properly installed and secured.

  2. Check that all wiring is correct.

  3. Ensure that terminal number 1 is connected to the 24 VAC input lead from a separate, isolated 24 VAC transformer.

    Notice

    The controller input power polarity and voltage level must be strictly observed. Failure to follow these instructions can result in equipment damage.

    Notice

    Do not connect 230 VAC or 110 VAC to any terminal. Doing so will permanently damage the device.

     
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  4. Ensure that terminal number 2 is connected to the same earth ground connection as the common (low/ground) lead from the 24 VAC transformer secondary.

    Notice

    Earth ground must be connected to avoid damage to the MP-V and to ensure proper operation of the controller. The earth ground wire must be connected to the equipment chassis, the 24 VAC transformer secondary lead, and the MP-V terminal number 2.

  5. After powering up, check that the Status LED changes to a constant green light after about a minute.

See Also

  • MP-V Device Installation
  • MP-V Built-in Power Supply
  • Grounding and Power for Systems with MP Controllers
  • MP-V Screw Terminals
  • MP-V-7A Screw Terminals
  • MP-V-9A Screw Terminals
  • Installing MP-V on a Damper that Rotates Counter-Clockwise (CCW) to Open
  • No Power or MP-V Does Not Turn On
  • MP Controller LEDs
  • Status LEDs
  • Configuring a Damper Command