and three-phase monitor
with protective cover
The DSP-1L or DSP-1LM is used to protect your three-phase motors against loss, imbalance or inversion. It continuously monitors each phase of your power supply. In case of phase loss, imbalance or inversion, the DSP-1L cuts off the power to the control circuit and thus protects the motor concerned.
The DSP-1LM is used to transmit a signal to a PLC. As soon as the three-phase power supply returns to normal, the DSP-1L enables the engine to restart normally and safely. However, the DSP-1LM’s Optomosfet contact will trip again.
Would you dare to connect your electrical equipment to a power supply not protected by fuses or circuit breakers? So now that
you know about the DSP-1L and DSP-1LM detectors, you know how to protect the production of your business against phase failures.
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Technical sheet of Phase Imbalance Detector (DSP-1L)
Also, our DSP-1L or DSP-1LM, in addition to being resistant to normal voltage fluctuations, is also equipped with a visual alarm indicator (LED).
For specific situations, a remote indicator light (GB-Kit Option) can be installed on the front of the control panel. The GB-Kit lights up regardless of the phase that is missing because it is not powered by the control transformer.
▶Two (2) years warranty
▶CSA and UL approved
▶Fully cast in epoxy
▶Requires no secondary power source
▶Self-checking electronic circuit
▶Easy to install
▶No adjustment needed
No, because the DSP-1L or DSP-1LM works only with three-phase voltage.
2- To which three-phase voltages can a DSP-1L or DSP-1LM be connected?
All three-phase voltages between 208 volts and 600 volts (do not forget to specify the desired voltage when ordering).
3- Can a DSP-1L or DSP-1LM still be connected to a voltage of 1200 volts or more?
Yes, with the use of a PT (Potential Transformer) because what is occurring on the primary side of the transformer is the same as the secondary side. So if there is a loss, an inversion, or a phase imbalance at the transformer input, it will be automatically analyzed by the DSP-1L or DSP-1LM at the output of these transformers.
4- What are the switch-on and switch-off times of the DSP-1L or DSP-1LM?
The delay is between 2 and 3 seconds, both for switching on and off.
5- The DSP-1L or DSP-1LM is adjusted to have an imbalance between 8 and 9% because, during a phase loss, there is a regeneration that reach up to 90% of the nominal voltage on the missing phase. This results in very rapid heating of the engine, which will eventually burn out.
Our detector is adjusted to an imbalance between 8 and 9% for maximum protection.
6- The DSP-1L or DSP-1LM works on voltage and not current, so it can be installed on engines with 1 hp or 2000 hp and more.
7- The GB-KIT or the LED light on the DSP-1L or DSP-1LM turns on to indicate a phase loss, phase inversion, phase imbalance or internal malfunction in the device.
8- The GB-Kit or the LED light on the DSP-1L or DSP-1LM turns on regardless of the missing phase because it is not powered by the control transformer, but by the internal power supply of the detector.
9- If GB-KIT oscillates, there may be two reasons.
a) An imbalance between phases that is close to the tripping threshold of the unit.
b) A change in the values of the internal components that affects the sensitivity calibration, making it increasingly sensitive (So instead of 8 to 9%, it will trend towards zero).
10- Even if the LED light or GB-KIT oscillates, the DSP-1L or DSP-1LM contact will not oscillate. When the oscillation reaches a certain speed, the contact will open to interrupt the starter circuit.
11- The DSP-1L triac contact has a capacity between 24 VAC / 240 VAC, with a 4.0 amp maximum.
The triac contact can only operate with an AC supply, and not DC.
12- The DSP-1LM OptoMosfet contact has a capacity of 30 VDC / 120 VAC, with 120 milliamps. The maximum contact resistance of the OptoMosfet is 35 ohms.
13- How can the DSP-1L triac contact be tested?
a) Never test the triac contact with an ohmmeter because it will always produce a resistance value, whether it is open or closed.
b) With the diode tester, the triac contact can be tested.
c) By placing a light in series with the triac contact.
d) Normally, if the LED light or GB-Kit on the DSP-1L or DSP-1LM is turned on, the contact is open and if the LED light is off, the contact is closed and functional.
DSP-1L is delivered “ready-to-install”; all calibrations have been performed with precision during manufacture. The DSP-1L is also adjusted to avoid false alarms. No need for auxiliary power, no rails, no plug-in modules to install. Due to its small size, it can be installed inside most control boxes.
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