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- PLC Interfacing and Controlling
Darrah offers a four channel PLC interface. Two channels from the PLC control the DC output current and voltage of the rectifier. Two monitor the DC voltage and current. Use PLC to start or stop the rectifier, and initiate ramp cycles, and unlimited timer functions. The PLC can also monitor safety circuits and alarms.
- Digital LED Meters
.5” high display, available with NEMA rated clear sealed covers.
- Ampere Time Meters
 Darrah offers over six variations
of Ampere Time Meters. Typical models include totalizing counters with manual or non-resettle counters.
Preset or countdown counters with switching circuits and alarms are also available.
Darrah's ampere time meters can be calibrated in seconds, minutes or hours. Choose between mechanical
or LED digital counters.
Accuracy is +/- 1%. Darrah's ampere time meter can be easily wired into any existing power supply system.
Enclosures are sealed in a thermoplastic design.
- Batch or Cycle Timers
Unlimited number of uses available in seconds, minutes or hours.
- DC Polarity Reversing
 Darrah Electric offers fully
automatic DC periodic reversing and polarity reversing either built in to new units or sold as a self
contained unit to be inserted into existing systems.
All Darrah reversing systems are rated for 100% continuous operation. DC amperages are available from
10 through 20,000 amps.
Periodic reverse controls include dual timer to set forward and reverse time settings. Adjustments can
be made at any time with immediate effects. Pilot lights are provided to indicate polarity direction.
Direct DC reversing units can be provided with or without timer. A selector switch is provided when units
are manufactured without timer.
 The DC reversing is accomplished
by heavy-duty contactors specifically designed for high current DC switching. Micro switches ensure correct
switching.
All units can be operated at remote location or easily connected to system controls or PLC.
AC line requirement for the reversing units is 115 volt, 1 phase.
- Timers
The use of timers with DC power supplies offers unlimited possibilities for controlling not only the
power supply but also additional related systems.
Timers can be supplied in either mechanical types with a preset range or microprocessor based, adjustable
between .01 seconds to 999 hours.
Typically switching circuits are provided to select the timer in or out of the control circuit.
Timers are commonly used for reversing output polarity or shutting the power supply off or on at the
end of the timed cycle. Buzzers and pilot lights can be provided to operate at the end of the timed cycle.
- Ground Fault Protection
 Darrah offers industrial quality
ground fault circuit detectors for personnel and equipment protection for their line of DC power supplies.
For higher voltage DC outputs, typically over 100 volts DC, Darrah offers personnel protection. This
unit is designed to shut the DC power supply off when either the positive or negative DC output touches
ground. Its trip point is set to operate at 15 milli amp trip current.
Circuits are provided for daily testing.
- PLC Programming
Control DC output current and voltages. Start processes or polarity reverse.
- Adjustable DC Voltage Ramp Control
Repeatable accuracy in processes requiring a preset DC voltage rise over an adjustable time period.
- Ripple Filtering
Available to maximum 5%, 2%, and 1% throughout entire DC output range.
- Adjustable Transformer Taps
 Many applications for DC
Power Supplies require at times one third or one half the DC output voltage for prolonged periods of
time.
By use of voltage adjustment taps with switching circuits, Darrah can offer beyond 50% power savings
and offer wider flexibility for DC power supply applications.
Use of transformer adjustment taps is recommended and can offer tremendous cost savings for a variety
of applications such as; hard chrome plating and test stations.
- 12 Pulse Designs
High efficiency, ultra low output ripple, lower harmonics.
- Other Popular Darrah Options
304 or 316 SS Enclosures
U/L and CSA Approves Model
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