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RM17- Zelio Control

RM17TG0 measurement and control relays for 3-phase supplies monitor the correct sequencing of phases L1, L2, and L3 and the total loss of two or more of these phases.

Function-RM17TG

Depending on the model, RM17TG control relays: 

  • Accept different nominal 3-phase voltage values
  • 208…480 V ∿ for RM17TG00
  • 208…440 V ∿ for RM17TG20 
  • Are designed for clip-on mounting on a rail

The control status is indicated by an LED

RM17TG0

Applications

  • Control for connection of moving equipment (site equipment, agricultural equipment, refrigerated trucks)
  • Control against reverse motor operation (lifting, handling, elevators, escalators, etc.)
  • Control of sensitive 3-phase supplies b Emergency power supply switching in abnormal conditions

Operating Principle

3 Phase supply control relays monitor:

  • Correct sequencing of phases L1, L2, and L3 
  • Fault signaling by LEDs 
  • Total loss of two or more of the phases

Phase Control

  • The relay monitors:
    • That the phase sequence and voltages are correct (> 183 V), the output relay(s) is/are closed and the yellow LED is on. 
    • If a sequencing fault or total loss of two or more phases is detected (detected as soon as two of the voltages drop below 100 V), the relay opens instantly and the LED goes off. 
    • On energization of the device with a detected measured fault, the relay stays open
RM17-phase-control-graph
RM17-phase-control-graph-legend

Description of RM17TG00, RM17TG20

  1. Spring for clip-on mounting on 35 mm/1.38 in. rail
RM17TG00
RM17TG20
FunctionRated 3-phase supply voltageOutputReferenceWeight
  • Phase sequence
  • Phase loss
208…480 ∿ V1 CO 5 ARM17TG000.080kg/0.176lb
208…480 ∿ V2 CO 5 ARM17TG200.085kg/0.187Ib

Multifunction 3-phase supply control relays 

RM17TT, RM17TA, RM17TU, and RM17TE

RM17TT, RM17TA, RM17TU, and RM17TE multifunction control relays monitor the following on 3-phase supplies:

3-phase-supply-control-relay-functions

Depending on the model, RM17T●00 control relays: 

  • Accept different nominal 3-phase voltages: 208…480 V ∿
  • Monitor their power supply measured as a true RMS value 
  • Are designed for clip-on mounting on a rail

They feature:

  • A sealable cover to help protect the settings 
  • A control status indicator LED
RM17T

Applications

  • Control for connection of moving equipment (site equipment, agricultural equipment, refrigerated trucks) 
  • Control against reverse motor operation (lifting, handling, elevators, escalators, etc.) 
  • Control of sensitive 3-phase supplies 
  • Emergency power supply switching in abnormal conditions

Description of RM17TT00, RM17TA00, RM17TU00, RM17TE00

1. Voltage range selector switch (208, 220, 380, 400, 415, 440, and 480 V ∿

2. Time delay adjustment potentiometer Tt

3a. Asymmetry threshold setting potentiometer Asy

3b. Undervoltage setting potentiometer <U

3c. Undervoltage/overvoltage setting potentiometer ∆U

4. Asymmetry threshold setting potentiometer Asy

5. Spring for clip-on mounting on 35 mm/1.38 in. rail

RM17TT00_desc
RM17TU00_desc
RM17TA00_desc
RM17TE00_desc

Operating Principles

3-phase supply control relays monitor:

  • Correct sequence of phases L1, L2, and L3 
  • Phase loss, including voltage regeneration 
  • Undervoltage from – 2…- 20% of the supply voltage Un 
  • Overvoltage from 2…20% of the supply voltage Un
  • Asymmetry from 5…15% of the supply voltage Un 
  • Fault signaling is by LED

Voltage switch operation: 

  • Set the switch to the 3-phase supply voltage Un. 
  • The position of this switch is taken into account on energization of the device. 
  • If the switch position is changed while the device is operating, all the LEDs flash, but the product continues to operate normally with the voltage selected at the time of energization preceding the change of position. 
  • If the selector switch is returned to the original position selected prior to the last energization, the LEDs return to their normal state.
RM17_func_diagram

RM17TT00

Phase + Voltage regeneration

RM17TT00_diagram

The relay monitors:

  • correct sequence of the three phases 
  • phase loss of at least one of the three phases (U measured < 0.7 x Un) 
  • If a sequencing or phase loss fault is detected, the relay opens instantly. 
  • On energization of the device with a detected measured fault, the relay stays open.

RM17TA00

Phase + Asymmetry

RM17TA00_diagram

The relay monitors:

  • correct sequence of the three phases 
  • phase loss of at least one of the three phases (U measured < 150 V) v asymmetry adjustable from 5…15% of Un 
  • If a sequencing or phase loss fault is detected, the relay opens instantly.
  • If an asymmetry fault is detected, the relay opens at the end of the time delay set by the user. 
  • On energization of the device with a detected measured fault, the relay stays open.

RM17TU00

Phase + Undervoltage

RM17TU00_diagram_1
RM17TU00_diagram_2

The relay monitors:

  • correct sequence of the three phases 
  • phase loss of at least one of the three phases (U measured < 150 V) 
  • undervoltage adjustable from – 2…- 20% of Un (- 2… – 12% in the range 3 x 208 V a and – 2%…- 17% in the range 3 x 220 V a due to the minimum voltage 183 V a) 
    • If a sequencing or phase loss fault is detected, the relay opens instantly. 
    • If a voltage fault is detected, the relay opens at the end of the time delay set by the user. 
    • On energization of the device with a detected measured fault, the relay stays open.

RM17TE00

Phase + Asymmetry + Undervoltage/overvoltage

RM17TE00_diagram_1
RM17TE00_diagram_2

The relay monitors:

  • correct sequence of the three phases 
  • phase loss of at least one of the three phases (U measured < 150 V) 
  • asymmetry adjustable from 5…15% of Un 
  • the overvoltage and undervoltage difference in window mode, adjustable from 2…20% of Un
    • If a sequencing or phase loss fault is detected, the relay opens instantly.
    • If an asymmetry or voltage fault is detected, the relay opens at the
      end of the time delay set by the user.
    • On energization of the device with a detected measured fault, the
      relay stays open.

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