48VDC modules - 40V 24VDC modules - 20V
2.5.3.2.3 Auxiliary Output voltagesThere are two types: Non isolated and isolated.
Isolated Auxiliary Output:
The isolated auxiliary voltage is switch selectable for 12V or 24V. Both voltage settings can supply 8 W outputs. The output is protected by fuse F2. All UPST2/3 and 4 units ship with the isolated auxiliary voltage set to 12V.
The UPS or the PCD does not detect the isolated auxiliary voltage setting.
If the voltage is changed to 24V, a label clearly indicating 24V needs to be placed on the modules faceplate.
To configure the Isolated Auxiliary Output for 24V:
1. Remove the UPS from the PCD.
2. Move the J10 jumper from pins 1&2 to pins 2&3.
3. Place a “24V Isolated Aux” label on the faceplate.
4. Reinstall the UPS card.
5. Power up the PCD and verify the auxiliary output voltage.
Table 2-3. Isolated Auxiliary Output Specifications
Availability All UPST2/3/4
Voltage 12V or 24V jumper selected.
Ships as 12V.
Power 8W Continuous (20W peak)
Isolation (hipot) To ANSI C37.90
Fuse F2 (5x20mm) 2 Amp Slow Blow
2.5.3.2.4 Nonisolated Auxiliary Output:
This output has the same features as the auxiliary output on the UPST1. Basically, the output tracks the battery charge voltage when available; otherwise the output tracks the battery voltage.
At least 10 W is available. The output is not fused.
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2.5.3.2.5 Battery Functions
UPST2/3/4 modules support 24 or 48 V batteries (by build option). The basic features are:
• Battery charge with charge voltage a function of temperature
• Operation off of the battery during AC input failure
• Battery test
• Controlled shutdown of the PCD for low battery voltage Battery Charge:
Charge current for UPST3 and UPST4 modules peaks at 1 amp. The time to charge a 12 amp-hour battery bank is approximately one day.
Note on UPST2: Most UPST2 applications will be used with the external Capacitor Assist Module (CAM). This external CAM will restrict battery charge to a trickle charge only. Battery charge times for UPST2 applications with the CAM will be unchanged from PCDs with the USPT1. Typically will require 8 days for full charge.
The battery charger only runs when the AC/DC input voltage is above a minimum level (see the summary), and when the UPSs internal temperature is not excessive.
The charge voltage is a function of ambient temperature, with the temperature sensed by an external thermistor. However, if the external thermistor is missing, the module’s onboard temperature is used for calculating the battery voltage.
Operation off of battery:
During AC/DC input failure, the UPS powers the PCD from the battery. The UPS then monitors the battery voltage and shuts down the PCD on a low battery condition (See Table 2).
Once the UPS has shutdown due to low battery voltage, the only way to restart the PCD is by restoring the AC/DC input or by pressing the battery start button (provided the battery voltage is an acceptable level.)
Note on UPST2: The battery start feature is functional on the UPS Type 2. However, most UPST2 installations will include an external Capacitor Assist Module. This external module will defeat the battery start feature. With the CAM you must restore the AC/DC input to restart the PCD.
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Battery Test:
The UPS tests the battery when requested by the PCDs CPU card. The battery test simulates the energy draw similar to that for operation of a recloser. The request for a test can be manually or automatically generated. Battery test requests are refused under these conditions:
• Must have one minute cool down between tests
• Loss of AC/DC input
• High ambient temperature 2.5.3.3 AC Input and Isolation
The AC input requires a nominal supply of 120 VAC at 80 VA maximum. The operating voltage range is -15% to +10%, or 102 to 132 VAC.
The AC power input is not internally isolated from the switched DC output, battery, or temperature sense terminals. Any connection between the AC power inputs and the other UPS terminals (except for the self-check relay outputs, which are fully isolated) will damage the UPS module. Unwanted connections can occur via a grounded battery, grounded load on the Switched DC Output, or during testing.
Note: The UPS module AC input power uses an isolation transformer. Use of a 120/240 V dual-primary transformer affords the additional option of 240 VAC input from a voltage transformer, with 120 VAC input voltage to the PCD.
2.5.3.4 Startup
With proper AC voltage applied to the UPS AC input, the UPS module automatically begins operation. However, if no AC voltage is present and the UPS module is connected to a charged battery, the UPS does not start automatically. This is a safety feature designed to avoid unexpected startups, saving both the UPS module and the battery.
2.5.3.5 Switched DC Out
The Switched DC Out provides DC voltage to auxiliary equipment such as a radio transceiver or telephone modem. The Switched DC Output supplies an output voltage of 50 – 60 VDC.
Auxiliary devices connected to the Switched DC Output can reduce the available current for battery charging. Switched DC Out loading must be carefully limited to a long time average of 0.50 A. Higher current levels, up to 2.50 A, are allowed for short periods, although extended periods will limit the battery charging and may promote deep discharge of the battery.
The Switched DC Out may support one MDS-2310A radio or the equivalent using a DC-to-DC converter to power 12/24 V accessories. A 48/12 V DC-to-DC converter is available from ABB;
contact your ABB sales office for this information.
The Switched DC Out is not fuse-protected against short circuits. If fuse protection is required, use the recommended external limiting resistor and fuse. Install in series with the Switched DC Output. The recommended parts are:
Resistor: 3 Ohm, 10%, 25 W wire wound—Ohmite L25J3R0 or equivalent Fuse: 2.5 A Fast Acting
2.5.3.6 Operation without a Battery
The UPS safely operates without a connected battery by using the capacitor assist module. The capacitor-assist module charges whenever the PCD is energized with AC. The capacitor-assist module allows for start-up, commissioning, testing and configuration of the recloser while the battery charges. Charging time for the capacitor assist module is approximately 30 seconds after
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require a connected battery when the system is in service. Note that when AC is lost, a record is logged in the Operations Records. “Loss of AC” alarm engages approximately 12 seconds after AC is lost. When AC is restored, a “Restoration of AC” alarm is logged approximately six seconds after restoration.
2.5.3.6.1 Battery Monitoring with Test
The PCD provides battery monitoring and tests to facilitate battery management through the UPS module.
A battery test measures battery capacity and health. The battery test initiates from the PCD HMI or through any of the communication protocols. To initiate the battery test from the HMI, press the PROG 1 pushbutton on the PCD. The battery test function applies a 1-ohm load to the battery for 100 milliseconds. The change in battery voltage during the test (no-load voltage minus loaded voltage) is reported as “Delta V.” If the difference of battery voltage is equal to or greater than 10% of the battery voltage, the battery is weak and may require replacement.
For firmware version 2.7 and later, when the test is done locally, a “Passed” or “Fail” indication will be displayed on the LCD.
Note: More than one battery test is not permitted within a two-minute interval.
The battery voltage measured at the UPS depends on the AC input voltage. If the AC voltage is applied, then the battery is under charge and the battery will eventually charge to the float voltage determined by the battery temperature.
If the AC voltage is not applied, then the battery will discharge to support the PCD and auxiliary devices. The battery discharge voltage may generally be lower than the battery voltage under charge. When the battery is at deep discharge, 40 V for a 48 V battery or 20 V for a 24 V unit, the UPS shuts down and the Switched DC Output turns off.
The total current delivered by the UPS charger to the battery, PCD internal circuits, or any other battery load, is 1.0 A for either battery voltage setting. The internal PCD circuits consume approximately 0.2 A at 48 V or 0.4 A at 24 V. The charging current to the battery is the total indicated current, minus the PCD current, minus any accessory current loads.
The status of the AC input is easily determined from the UPS charger current. If AC is off, the indicated current will be near zero. When AC is on, the current is the amount required to support the PCD.
2.5.3.6.2 Automated Battery Test
For firmware version 2.7 and later, a periodic battery test can be conducted. In Configuration Settings, select one of the following options:
•
Disabled - No automatic test will be done (default).
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One time per day - A load test will be performed on a daily basis at 1:00 am per the PCD clock. The first day will not have a test performed.
•