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Control and monitoring relays
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The new family of RM17 & RM35 Zelio control & monitoring relays provide a comprehensive range of: Phase, voltage, current, frequency, level, pump, speed and temperature control relays. |
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Phase Control relays:
Phase loss & phase sequence are two of the most basic functions that these relays can provide protection against, stopping a motor or preventing it from starting avoiding costly and time consuming damage.
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Other functions include: |
- Unbalance level
- Voltage between phases and neutral
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Voltage control relays: monitor the input voltage level compared to a high or low threshold preset by the user. These then simply check that the voltage remains within a predetermined high and low level limit.
Current control relays: dedicated to the measurement of under and over current, without external sensors, up to 15A current control relays enable continuos monitoring of the operation of electrical and mechanical loads such as motors and resistors. Simple to install and adjust, these control relays are for applications as varied as ventilation, pumping, and conveying.
Frequency control relays: monitor positive or negative frequency variation of 50 or 60Hz alternating signals entering their measurement circuits.
Speed control relays: can receive pulses from all types of sensors such as:
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- Inductive sensors on gear wheels
- Photoelectric sensors on conveyors
- Microswitches on cams.
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Dependant upon rotation or movement speed, the pulse rate supplied to the relay varies. By monitoring the pulse rate, the relays control over or under speed. Applications include monitoring of rotation speed, transporter or conveyor belt speed, pump rotation, etc.
Lift temperature control relays (Lift application): monitor the temperature in control or pulley rooms to check that it remains within the regulated limits. (Conforming to EN81) A combined temperature and phase control version of the relay is available.
Level control: These devices monitor the levels of conductive liquid or non-conductive material. (Resistive level probe or discrete sensor) They control the actuation of pumps or valves to regulate levels. They are also suitable for protecting submersible pumps against dry running, or protecting tanks from "overflow". They can also be used to control dosing of liquids in mixing processes and to protect heating elements in the event of non-immersion.
Pump control: control pumps (single or 3-phase) using discrete control inputs and monitor current (dry operation and overload protection) and the state of supply phases. |
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