RM4TG20 TELEMECANIQUE, RM4TG20 Datasheet - Page 18

• Manufacturer Part Number: RM4TG20
• Description: PHASE MONITORING RELAY, DPDT-2CO, 484VAC
• Manufacturer: TELEMECANIQUE
• Series: RM4r

Specifications of RM4TG20

• Contact Configuration: DPCO
• Phase Type: 3 Phase
• Supply Voltage Max: 484VAC
• Switching Voltage Max: 440VAC
• Relay Mounting: DIN Rail
• Length/height, External: 78mm
• External Width: 22.5mm
• External Depth: 80mm
• Carry Current: 8A

Characteristics :
page 3/47
References :
page 3/48
Dimensions, schemes :
page 3/49
Zelio Control - measurement and control relays
3-phase supply control relays RM4-T
Presentation
Operating principle
The supply voltage to be monitored is connected to terminals L1, L2, L3 of the product.
There is no need to provide a separate power supply for RM4-T relays; they are self-powered by terminals L1, L2, L3.
i Monitoring rotational direction of phases and detection of complete failure of one of more of the phases
i Overvoltage and undervoltage detection (RM4-TR):
Function diagram (RM4-TR31, RM4-TR32)
t: time delay
Function diagram (RM4-TR33, RM4-TR34)
t: time delay
Function
Function
Function
Function
(RM4-T all models)
When terminals L1, L2, L3 are energised, the relay is energised and the yellow LED comes on if the rotational direction
of phases is correct and if all 3 phases are present.
If one or more of the phases have failed or if the rotational direction is incorrect, the relay is not energised at switch-
on. In normal operation (no fault) the relay is energised; it de-energises instantaneously in the event of failure of one
or more of the phases (any time delay set is not active on these faults).
In the event of failure or absence of a single phase, a voltage greater than the detection threshold ( 130 V on RM4-TG,
undervoltage threshold setting on RM4-TU and RM4-TR) can be generated back through the control circuit, thus
preventing detection of the phase failure. In this case, we recommend the use of RM4-TA relays.
The absence of a phase is signalled, on RM4-TR and RM4-TA, by illumination of led “P”.
In normal operation, the relay is energised and LEDs “U” and “R” are illuminated.
If the average of the 3 voltages between phases goes outside the range to be monitored, the output relay is de-
energised:
- overvoltage: the Red LED “> U” illuminates.
- undervoltage: the Red LED “< U” illuminates.
When the supply returns towards its rated value, the relay is re-energised according to the hysteresis value (5%) and
the corresponding red LED goes out.
A selector switch allows selection of an adjustable time delay from 0.1 s to 10 s. With function
“under” voltages are not taken into account. With function
re-energisation of the relay is delayed.
In all cases, in order to be detected, the duration of the overvoltage or undervoltage must be greater than the measuring
cycle time (80 ms).
TR33
242 V
230 V
208 V
198 V
0.95 x Setting > U
1.05 x Setting < U
RM4-TR31
RM4-TR32
RM4-TR33
RM4-TR34
Setting > U
Setting < U
TR34
U
15/18 25/28
15/16 25/26
15/18 25/28
15/16 25/26
U
15/18 25/28
15/16 25/26
15/18 25/28
15/16 25/26
440 V
418 V
378 V
360 V
L1 L2 L3
L1 L2 L3
(continued)
t
t
t
t
t
t
t
t
all variations above or below are taken into account and
t
t
< t
t
< t
t
< t
< t
t
t
Te
0 Volt
0 Volt
transient “over” or
3/45
3