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Contents Introduction 3 Safety 5 General Safety Practices 5 Installation 11 Tabletop and Pedestal Mount Wall Mount Cabling 11 11 12 Operation 13 Operator’s Panel 14 Main Screen Status Screen Auto Setup 14 18 21 Setting Up Run On Demand (ROD) 24 Run On Demand Detailed Example 25 Operating the HPU Remotely 27 Recovering From an Interlock 27
Introduction The Remote Human Machine Interface (RHMI) allows you to operate a single Hydraulic Power Unit (HPU) remotely. The RHMI comes in two configurations: a standalone unit and a pedestal mount unit. The standalone unit can be placed on a table or mounted on the wall. Note The RHMI can only be used on the G2 HPU models. It will not work with the older HPU models. Contact MTS for additional information. There is one RHMI per one HPU.
4 Introduction Remote Human Machine Interface
General Safety Practices Safety General Safety Practices The Remote Human Machine Interface (RHMI) provides remote control of a hydraulic power unit (HPU). The HPU provides high pressure hydraulic fluid to system components for system operation. This section provides general information about safety issues that pertain to system hydraulic supply and distribution components.
General Safety Practices It is very important that you study the following safety information to ensure that your facility procedures and the system’s operating environment do not contribute to or result in a hazardous situation. Remember, you cannot eliminate all the hazards associated with this system, so you must learn and remain aware of the hazards that apply to your system at all times.
General Safety Practices Know potential crush and pinch points Be aware of potential crush and pinch points on your system and keep personnel and equipment clear of these areas. Remember, when hydraulic power is interrupted on a servohydraulic system, it is likely that stored accumulator pressure will persist for some time within the system. In addition, it is likely that as stored energy dissipates, gravity will cause portions of the system to move.
General Safety Practices Provide adequate lighting Ensure adequate lighting to minimize the chance of operation errors, equipment damage, and personal injury. You need to see what you are doing. Provide means to access out-of-reach components Make sure you can access system components that might be out of reach while standing on the floor. For example, ladders or scaffolding might be required to reach load cell connectors on tall load units.
General Safety Practices Do not use RF transmitters Keep radio frequency (RF) transmitters away from the workstation computers, remote terminals, and electronics consoles. Intense RF fields can cause erratic operation of the more sensitive circuits in the system.
General Safety Practices 10 Safety Remote Human Machine Interface
Tabletop and Pedestal Mount Installation The Remote Human Machine Interface (RHMI) allows you to operate a single Hydraulic Power Unit (HPU) remotely. The Remote Human Machine Interface (RHMI) comes in two configurations: a standalone unit and a pedestal mount unit. The standalone unit can be placed on a table or mounted on the wall. Tabletop and Pedestal Mount Installation of the tabletop or pedestal mount consists of simply placing the unit where you want it and connecting the cables.
Cabling Cabling Cabling consists of connecting the cables between the RHMI and the Hydraulic Power Unit (HPU). Maximum distance between the RHMI and HPU is 100 meters. Refer to the following figures.
Operation Operation of a hydraulic power unit (HPU) from the remote human machine interface (RHMI) is the same as operation of the HPU from the human machine interface panel on the HPU main electrical enclosure. Operation information from the standard HPU manual is repeated here for your convenience. The information is from the large HPU manual but can be used as reference for the smaller HPUs; that is, some of the options and features described here might not apply to the smaller HPUs.
Operator’s Panel Operator’s Panel Main Screen The Main screen is displayed initially when the HPU is powered up. The following table describes the pushbuttons and indicators on the Main screen.
Main Screen Name and Location Description Faulted/Ready/Running/High Pressure/Alarm/Overtemp Bypass Indicator. Indicate the various state of the HPU Faulted - red: Indicates when an interlock has occurred and the HPU has been shut down. Ready - green: Indicates the interlocks are cleared and the HPU is ready to start. Running - green: Indicates the HPU is running in low pressure. High Pressure - green: Indicates at least one pump motor is running in high pressure.
Main Screen Name and Location Description High Pressure Pushbutton/Indicator. Used to put the HPU in high pressure. High Pressure - gray: indicates the HPU is not in high pressure. High Pressure - green: Directs the HPU to sequence to high pressure. When the HPU is in high pressure it will be indicated on the main display. Remote Operation Indicator - green. Used to indicate the HPU is being operated by the RHMI. If the HPU is being operated by the HMI on the HPU the RHMI shows disabled.
Main Screen Name and Location Description Oil Flow (optional) Indicator/Display: Displays the total hydraulic fluid flow form all running pumps. A flow meter must be installed on the HPU for this feature to be available. Main Pushbutton/Indicator. Pushbutton used to select the Main screen. Main - gray: In this state, one of the other screens is selected; for example the Status screen. Main - black: The Main screen is selected and displayed. Status Pushbutton/Indicator.
Status Screen Status Screen The Status screen is displayed by pressing the Status button on the Main screen. The following table describes the pushbuttons and indicators on the Status screen. Name and Location Description Watchdog Indicator. Used to indicate the status of the watchdog timer. Watchdog - gray (OK): Indicates the PLC that controls the HPU is operating normally. Watchdog - red (fault): Indicates there is a problem with the hardware watchdog timer and the PLC is not operating correctly.
Status Screen Name and Location Description Oil Level Indicator. Used to indicate if the hydraulic fluid level is within acceptable limits. Oil Level - gray (OK): Indicates the hydraulic fluid level is within acceptable limits. Oil Level - red (fault): Indicates the hydraulic fluid level is not within acceptable limits and an interlock is active. Oil Temp Indicator. Used to indicate if the hydraulic fluid temperature is within acceptable limits.
Status Screen Name and Location Description Status Indicator: Indicates the state of the associated module. Status - blue-green: Label. Disabled - light gray: Indicates the module is present but is not enabled. Enabled - green: Indicates module is enabled and is ready to into a run condition (replaces READY). Running - green: Indicates the associated pump module is running in low pressure. High pressure - green: Indicates the associated pump module is running in high pressure.
Auto Setup Auto Setup Note ROD (Run On Demand) is a purchased option. Auto Setup parameters can only be viewed on the RHMI. All parameters must be changes at the local HPU HMI. Information in the following paragraphs is for reference only. To select this screen, press and hold the Auto Setup button for five seconds.
Auto Setup Control Descriptions ROD Flow Buffer (units) ROD Flow Buffer (units) - blue-green: Indicator used as a label for the pushbutton switch below it. ROD Flow Buffer numeric display - pushbutton/indicator - gray: Used to set the reserve flow capacity for run on demand. Push the button to display the numeric keypad. With the keypad displayed, use the number keys to define the desired value then press Enter to set the value and return to the Auto Setup screen. For example, assume a buffer of 20.
Auto Setup Control Descriptions ROD On Delay (sec) ROD On Delay (sec) - blue-green: Indicator used as a label for the pushbutton switch below it. ROD On Delay numeric display - pushbutton/indicator - gray: Used to set the delay in seconds. The flow must be at or above the trigger level for this amount of time before the next pump motor turns on. Push the button to display the numeric keypad.
Setting Up Run On Demand (ROD) Setting Up Run On Demand (ROD) The ROD option automatically starts or stops pumps to meet the hydraulic flow demand from the system. The PLC monitors the hydraulic fluid flow. When the flow changes beyond a trigger point for a set period of time, one of the pumps is turned on or off. Refer to the previous table for a description of the controls referenced in the following procedure. 1. From the current screen, press the AUTO Setup button on the Main screen.
Run On Demand Detailed Example Run On Demand Detailed Example Run On Demand (ROD) is a system that monitors the output flow of the Hydraulic Power Unit (HPU) and turns on and off pumping modules as needed to best meet the users demands. The parameters for ROD that need to be set by the user include: • On Delay: the period of time that must pass where the criteria are met or exceeded before the next module(s) will be turned on.
Run On Demand Detailed Example An example is shown below. In the example Module Flow is set at 30 gpm, Minimum Flow is set at 10 gpm, Buffer Flow is set at 4 gpm (which means the total actual buffer is 10 gpm), Δton represents the on delay and Δtoff represents off delay. The HPU starts out with one module running to create 30 gpm of available flow. This satisfies both the Minimum Flow requirement (10 gpm) and the Buffer Flow requirement (10 gpm).
Operating the HPU Remotely Operating the HPU Remotely The HPU can be operated locally using the controls on the HPU HMI panel or remotely using the RHMI or system controller. This section describes remote operation using the RHMI. The RHMI must be connected to the HPU. 1. Make a general inspection of the HPU. Ensure that all cooling water valves are open. Ensure the Emergency Stop button is released. 2. If not already displayed, press the Main button to display the Main screen. 3.
Recovering From an Interlock 2. Add hydraulic fluid to the reservoir until the sight glass on the side of the HPU indicates the proper level. 3. Verify that the hydraulic fluid level sensor is detecting the proper fluid level. 4. Press Reset to clear the interlock and change the unit status back to normal.
Recovering From an Interlock Watchdog Fault The HPU Fault Status on the user interface panel displays Watchdog fault if the watchdog timer stops operating properly. A watchdog fault causes the HPU to shutdown. Perform the following procedure to attempt to recover from this fault. 1. Turn the power disconnect switch on the main enclosure to off. 2. Wait at least 60 seconds, then turn the power disconnect switch to on. 3. From the Startup Screen, press the Main Display button. 4.
Recovering From an Interlock 30 Operation Remote Human Machine Interface
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