DC/Telecom

Filtered Battery Charger/Rectifier

Maximizes Battery Performance and Life.

Charger/Rectifier Product Highlights

SENS DC/Telecom chargers/rectifiers supply reliable DC power to telecommunications, process control and other equipment that requires a well filtered source.

The DC/Telecom ensures the highest possible reliability of a battery-backed DC power system. The DC/Telecom automatically eliminates the No. 1 cause of premature failure in maintenance-free batteries -- improper charging. The filtered output and SENS' temperature-compensated control circuitry extends battery life, eliminates over- and undercharging and reduces risk of thermal runaway.

SENS DC/Telecom chargers are designed for service anywhere in the world. Standard units operate on either 50 or 60 Hz; input voltage is field-selectable for either 115 or 230 volts.

The DC/Telecom is the latest generation of highly reliable chargers/rectifiers that SENS has shipped to over 40 nations since 1971. Standard features include AC line compensation, precision voltage regulation, current limiting, input and output circuit breakers, comprehensive alarm system, voltmeter and ammeter, forced load sharing, and high-voltage shutdown.


 

Charger/Rectifier Specifications

Input Voltage Range
115 volts, 60 Hz: 100-132 volts
230 volts, 60 Hz: 198-264 volts
230 volts, 50 Hz: 198-242 volts
Optional voltages: see Model Number Breakout. Optional voltages +10% of rating.

Input Frequency Range
50/60 Hz rating: 47-63 Hz
60 Hz rating: 57-63 Hz
50 Hz rating: 47-53 Hz

Output Voltage
12, 24, 48, 120 & 240 volts nominal. Other voltages available. Float voltage adjustable from 90% to 120% of nominal. Equalize voltage adjustable up to 15% above float voltage.

Output Voltage Regulation
+1% from no load to full load of the correct temperature compensated value with simultaneous variations in input voltage of +10% and frequency of +5%.

Current Limiting
Factory set limit is at 100% of rated current. Limit adjustable from 50% to 110% of rated current.

Protection
Soft start - ensures smooth start up.
Precise electronic current limit.
AC circuit breaker.
DC circuit breaker.
High DC voltage shutdown.

Ambient
Operating temperature: -20 C to +50 C.
Storage temperature: -40 C to +85 C.
Humidity: 5% to 90% non-condensing.

Temperature Compensation
All batteries have a negative temperature coefficient. The DCT is equipped with the appropriate temperature compensation (-0.2% per deg. C) to assure correct charging in all conditions. Provision for remote temperature sensing is included. The remote sensor is optional. (See Figure 1)

Parallel Operation
A paralleling circuit forcing load sharing to within +10% from low load to full load is standard. It is activated by connecting a control wire between chargers.

Output Ripple & Noise
(12, 24, 48 VDC): 30 mV rms maximum ripple and 32 dBrnC voice-band noise when connected to a battery having capacity in AH four times the ampere output rating of the charger. 100 mV rms maximum with battery disconnected.
(120 VDC): 150 mV rms maximum ripple when connected to a battery having capacity in AH four times the ampere output rating of the charger.
(240 VDC): 300 mV rms maximum ripple when connected to a battery having capacity in AH four times the ampere output rating of the charger.

Controls and Adjustments
 

Indicators
DC voltmeter: 3.5" (88mm) scale, 2% accuracy.
DC ammeter: 3.5" (88mm) scale, 2% accuracy.
Refer to Alarm Systems Table.

Optional Battery Charger Features
 

Ordering Information Table

Note: Refer to the Model Number Breakout diagram for how to specify alarms, input voltage and options.

The standard configuration is shown in the price list.

How to Order SENS DCT Battery Charger
 

1. Determine the charger model number. Refer to the Ordering Information Table and Model Number Breakout.
2. If non-standard input voltage, alarm system or float/boost control are required, specify these by changing the part number suffix.
3. If other options are required, specify these as line items.

SENS DCT Battery Charger Specification

Heavy-Duty Industrial Battery Charger,
Single-Phase Input

Battery Charger Design Guidelines
Charger shall be designed for heavy-duty industrial service and capable of full-rated output indefinitely at temperatures between -20 C and +50 C. Conservatively rated silicon power semiconductors in a full-wave bridge shall be used. Charger shall be capable of recharging a fully discharged battery of the maintenance-free lead acid, conventional (wet) lead acid or nickel-cadmium type. The charger housing material shall be inherently non-rusting. Charger mounting shall be field selectable for wall or relay rack mounting.

Battery Charger Standards
Charger shall be designed and built in accordance with applicable NEMA standards, UL 1012, and best commercial practice for industrial and utility grade rectifiers/chargers. The manufacturer shall maintain comprehensive quality systems and shall be ISO 9001 or ISO 9002 registered.

Battery Charger Input
Charger shall operate from: 50 Hz (47 to 53 Hz range) or 60 Hz (57-63 Hz range).
Nominal input voltage shall be: (100V, 120V, 127V, 208V, 220V, 230V, 240V, or field-selectable 115/230V).
Charger shall incorporate a soft-start feature in which output is gradually increased from zero to full, required output within 5 to 10 seconds. Input protection shall consist of a 2-pole circuit breaker. Proven surge suppression devices shall be fitted.

Battery Charger Output

General Characteristics
 

Charger shall be filtered to minimize interference with load and control equipment. Output ripple voltage in 12, 24, and 48 volt units shall be 30 mV rms when connected to a battery having capacity in AH four times the ampere output rating of the charger. Ripple voltage in 120 volt units shall be 150 mV rms maximum when connected to a battery having capacity in AH four times the ampere output rating of the charger. Ripple voltage in 240 volt units shall be 300 mV rms maximum when connected to a battery having capacity in AH four times the ampere output rating of the charger.

Regulation and Temperature Compensation
 

Charger shall incorporate automatic ambient temperature compensation to maximize battery performance and life. Temperature coefficient shall be -0.18% per degree C to assure correct charging at all temperatures. Provision shall be made for simple field retrofit of remote temperature compensation probe. Temperature compensation shall automatically revert to local sensing if the remote temperature probe is damaged or disconnected.

Float/Equalize Control
Charger shall include an automatic equalize feature that is activated when the battery's state of charge is reduced. A front panel switch shall be provided to enable manual selection of float, boost or automatic modes.

Auxiliary Circuits
The charger control system shall include a high-voltage shutdown system and means for forced load sharing to within +10% when two or more chargers of the same rating are connected in parallel.

Indicators and Alarms
 

Form C contacts shall be provided for AC fail, charger fail, low-battery voltage, high-battery voltage, positive or negative ground fault, and summary fail alarms. Delay circuitry on the remote contacts shall prevent spurious alarms of abnormal DC voltages. Contacts shall be rated at 2A at 26 VDC or 0.25A at 117 VAC.

The battery charger shall be Stored Energy Systems type DCT or approved equivalent.
 

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