5ARNING and CAUTION labels are usedto attract attention to essential or critical information in this manual. The labels will appear next to the messages associated with them.
Warnings indicate condition, practices,or procedures that must be observed to avoid personal injury or fatalities.
Cautions indicate a situation that may cause damage or destruction of equipment or may pose a long-term health hazard.
GENERAL DESCRIPTION
T66666 DC power controller IP400VPCB was designed specifically to provide DC power to continu
electrodeionization modules manufactured by Ionpure Technologies. These modules will be referred to as “LX modules” in this manual.
his 4er controller util44s a phase-angle fired SCR bridgeto produce a variable DC output from a single-phase AC input. Maximum DC output voltage is 200, 300 or 400VDC, corresponding to an AC input voltage of 220, 330, or 440 VAC, respectively. The AC input must be isolated from the AC mains by an isolation transformer.
The maximum DC output current can be jumper selected at2.5, 4, 6.5 or 10 amperes. A “current fold back”
control circuit limits the maximum current to these values regardless of load resistance.
The controller can be operated in either constant voltage or constant current mode. In constant voltage mode, the DC output voltage will be maintained constant at the value selected by the operator, except in cases where the current limit is reached. If the load resistance decreases sufficiently so that the current reaches the current limit, the voltage will be reduced automatically to maintain the current at the limit.
In the constant current mode, the output current will be maintained constant at the selected value, regardless of
the load resistance, except in cases where the voltage required reaches the maximum DC voltage possible (90% of
the RMS AC input voltage). The voltage would then be limited to the maximum value, and if the resistance continues to increase, the output current will decrease.
The DC output voltage or current can be adjusted by the following methods:
• An optional display board, Part No. IP DISP1, which can control and display the DC output from one power controller.
• An optional display board, Part No. IP DISP8, which can control and display the DC outputs from up to eight
power controllers.
• A 0 - 5 VDC input signal from a remote process controller, such as a PLC.
The power controller output can be turned on and off by a remote set of contacts, such as in a flow switch. 0-5 VDC output signals corresponding to the output voltage and current are available for a remote voltmeter and ammeter to indicate the output voltage and current.
The power controller is contained on a single PC board and mounted on an aluminum chassis. The dimensions are shown in Figure 1.
The DC power controller is to be mounted on a sub-panel inside an enclosure with at least four screws, either M4 or UNC 8-32. The location of the mounting slots is shown in Figure 1.
The unit is cooled by convection, and must be located where there is no interference with air circulation. The environmental limits for operation are 0 °C to 50 °C at up to 90% relative humidity (non-condensing).
An enclosure with at least an IP52/NEMA 12 rating is recommended. The enclosure should include a cooling fan that draws ambient air through the enclosure.
In installations where a water resistant enclosure (IP56/NEMA 4) is necessary, cooling the interior of the enclosure is more difficult. Typical cooling methods include:
• Sizing the enclosure for sufficient rate of heat transfer to the environment through the enclosurewalls
• Air-to-air or water-to-air heat exchanger
• Air conditioning
DC POWER CONTROLLER – IP- 400VPCB
The maximum heat generated by each power controller is approximately 40 watt. Additional heatgeneration is expected from the isolation transformer and other equipment in the enclosure.
2. AC Supply
An electrical schematic for a typical installation is shown in Figure 2.
2.1 Isolation transformer
The AC input to the DC power controller must be isolated from the AC mains by an isolation transformer that is correctly sized for the maximum power required from the power controller. The purpose of the transformer is to:
• Isolate the AC input to the power controller from the AC mains so that the DC negative output can be grounded.
• Convert the voltage of the AC mains to an AC input voltage for optimum operation of the power controller and the LX module. The transformer shown in Figure 2, for example, can convert the 220 VAC from AC mains to either a 220 VAC or 330 VAC input to the power controller.
The secondary of the transformer must NOT be connected to earth ground. Grounding
the secondary and the DC negative will damage the power controller.
Please see Appendix A for recommended designs for the isolation transformers.
2.2 Overcurrent protection
The power controller does not have built-in fuses for the AC input. Overcurrent protection devices, such as circuit breakers or fuses, must be installed between the isolation transformer and the AC input terminals, as shown in Figure 2
Since the maximum DC output current is limited to 10 A, a current rating of up to 20 A for the overcurrent protection devices is recommended for most installations.
Overcurrent protection devices must also be installed on the primary of the isolation transformer and sized correctly according to applicable local electrical codes.
Figure 2. Electrical schematic of a typical installation
3. High Voltage Connections
3.1 initial selection of AC input voltage
Use the LX Performance Projection Program (IP-PRO2003) to estimate the DC voltage and current requirement per LX module, which depend on the feed water flow rate, composition and temperature. Select the secondary winding on the isolation transformer with the lowest voltage that would still result in a maximum DC voltage above the required value. Note that the maximum DC voltage is approximately 90% of the secondary AC voltage.
Assuming that a 5 kVA isolation transformer as shown in Figure 2 is installed for an IP-LXM24H-3 module, and the DC voltage calculated by the LX Performance Projection Program is 175 VDC.
The secondary winding for 220 VAC will result in a maximum DC output of 200 VDC and the secondary winding for 330 VAC will result in a maximum DC output of 300 VDC. Select the 220 VAC winding.
Wire the secondary of the transformer for 220 VAC, which will be the voltage of the AC input to the power controller.
iring connections and jumper locations on IP400VPCB
Figure 3. Wiring connections and jumper locations on IP400VPCB
AC and DC power connections must be made as follows (see Figure 3):
Connection Terminal
AC input T1 and T2
DC positive output DC+
DC negative output DC-
Ground DC-
Please see the Operation and Maintenance Manual for the LX module for details on the terminals inside the junction boxes on the module.
The DC negative output must be grounded. A second DC- terminal is provided on the power controller for connection to the protective bonding circuit (Ground circuit) inside the power supply enclosure.
4. Jumpers and Selector Switches
4.1 Jumper for selection of AC input voltage
The jumper for the AC input voltage (see Figure 3) must be placed in the position corresponding to the voltage of the AC input from the isolation transformer. Failure to do so will result in failure of the unit.
4.2 Jumper for selection of AC frequency
The frequency select jumper adjusts an internal control waveform, and must be set to the frequency of the AC input.
4.3 Jumper for current limit
The current limit jumper can be placed in one of four positions, corresponding to 2.5, 4, 6.5, and 10 amperes current limit.
For LX modules, set the limit at 10A unless otherwise instructed by the Operation Manual for the LX system.
4.4 Slide switch for selection of control mode
Slide position Control mode
V
A
Constant voltage mode
Constant current mode
Constant current mode is recommended for operation of LX modules.
一对0-5VDC隔离输出信号是留给外部显示的。该信号为每10mv对应直流输出为1v。
如果需要将下列端子接外部电压表或显示(见图三):
Vout 信号正极
COM 信号负极
这些信号是由运放产生,请不要将其和电源连接或和小于10K OHM的电阻连接。
另一队隔离输出 0-5VDC信号是留给外部电流显示用的,该信号对应0-100%的电流设定
值。
需要时将下列端子接到外部电流表或显示。
Iout 信号正极
COM 信号负极
• Install the single-channel display board, Part No. IP DISP1, on the door of the enclosure. This board can control and display the DC output from one power controller. See instructions for the display board for mounting instructions. Plug one end of the control cable (ribbon cable) into the socket on the DC power controller header (see Figure 3). Plug the other end into the display board. The output voltage or current, depending on the control mode selected, is adjusted by a potentiometer on the display board.
• Install the eight-channel display board, Part No. IP DISP8, on the door of the enclosure. This board can control and display the DC outputs from up to eight power controllers and is used in systems with multiple LX modules with individual power controller for each module. See instructions for the display board for mounting instructions. Plug one end of the control cable (ribbon cable) into the socket on the DC power controller header (see Figure 3). Plug the other end into the display board. The output voltage or current, depending on the control mode selected, is adjusted by a keypad on the display board.
• Use a 0-5 VDC isolated signal from a remote source (a PLC, for example) to control the DC output. Connect the control signal as follows (see Figure 3):
Ctrl Signal positive
COM Signal negative
In the voltage control mode, the 0-5 VDC corresponds to 0-100% of maximum DC voltage.
In the current control mode, the 0-5 VDC corresponds to 0-100% of the current limit.
5.2 Remote ON/OFF
The DC output could be switched on/off by a remote isolated non-powered contact (dry contact), connected to the plug-in terminals labeled “ON/OFF” (see Figure 3). A closed contact allows the DC power controller to operate; an open contact disables the controller. If a display board is installed, the yellow “STANDBY” or “DISABLED” light on the board will be lit when the controller is disabled.
In typical installations, the “ON/OFF” terminals are connected to one or more flow switches on the feed, product and/or reject streams on the LX module or system to prevent DC power from being applied to the module when there is no water flow. The switches must be wired in series if more than one flow switch is installed.
This control does not shut off AC power to the unit. To remove AC power, a contactor is required on the primary of the isolation transformer, as shown in Figure 2.
In typical installations, the coil of the contactor is wired so that the contactor is closed only when there is
feed water flow to the LX module(s).
5.3 Analog outputs
• A 0-5 VDC optically isolated output signal pair is provided for remote display of output voltage. The signal is calibrated to 10 mV = 1 V of DC output.
Connect the following terminals to a remote voltmeter or display if required (see Figure 3):
Vout Signal positive COM Signal negative
These signals are developed by operational amplifiers, and must not be connected to power sources or drive load resistance less than 10 KΩ.
8 IP-LX400PWRMAN REV -
• A 0-5 VDC optically isolated output signal pair for remote display of output current. The signal is calibrated to 0-5 VDC corresponding to 0-100% of the current limit.
Connect the following terminals to a remote ammeter or display if required (see Figure 2):
These signals are developed by operational amplifiers, and must not be connected to power sources
or drive load resistance less than 10 KΩ.
OPERATION
1. Initial Startup
The startup sequence depends on the design of the LX system. Please consult the Operation Manual for the LX system.
1.1 Example of startup procedure
The following startup procedure is only an example for a typical single module LX system with electrical schematic as shown in Figure 2.
• Close the main disconnect switch (or circuit breaker) for the LX system. The LED display on the display board must be lit. The green “AMP” light next to the display must be lit. The output current is displayed by default.
• The yellow “STANDBY” light on the display board must be lit if there is no flow through the module and the flow switch is open.
• If the display board has a potentiometer for adjusting the power controller output, turn the potentiometer to fully counter-clockwise position (zero output).
• Open the appropriate valves and start the pretreatment equipment, such as the reverse osmosis (RO) system, ahead of the LX system.
• Adjust the flow rates of the dilute and concentratestreams through the module. The green “ON” light is on the display board must be lit once the flow switch is closed.
• Slowly increase the DC output current to the value calculated by the LX Performance Projection Program. For a display board with potentiometer, turn the potentiometer clockwise. For a display board with keypad control, use the “UP” and “DOWN” buttons. The power controller will maintain the current at that setting if the current control mode is selected and if the required voltage to drive the current is lower than the maximum DC voltage available.
• Push the switch labeled “PUSH TO DISPLAY VOLTAGE” to read the DC output voltage. The green “VOLT” light next to the display must be lit.
During normal operation, no further attention to the DC power controller is necessary. The DC output will
be turned off if the flow switch opens, and the yellow “STANDBY” light on the display board will be lit. This
situation may occur, for example, if the flow monitored by the flow switch is shut off accidentally. If there is
an interlock between the RO process controller and the contactor ahead of the isolation transformer, the
contactor will open if the RO system shuts down.
2. Output Adjustment
The DC output current may need to be adjusted if there is a change in feed water conditions such as flow rate, composition and/or temperature.
3. Change in Transformer Secondary Voltage
3.1 Reasons for changing transformer secondary voltage
Under normal operating conditions, the electrical resistance of the LX module may vary depending on the composition and temperature of the feed water. A lower feed water temperature would increase the module resistance, for example. The module resistance, however, may also increase if the module is fouled by organic matter or scaled.
9 IP-LX400PWRMAN REV -
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