Page 103 - EPR Catalog 2015

Three-phase monitoring relays
Function diagrams

CM-PSS.xx, CM-PVS.xx, CM.PAS.xx, CM-MPS.xx, CM-MPN.xx CM-MPS.11, CM-MPS.21, CM-MPS.23 2
Interrupted neutral monitoring
Phase sequence monitoring and phase failure detection The interruption of the neutral in the main to be monitored is
Applying control supply voltage begins the fixed start-up delay detected by means of phase unbalance evaluation.
tS. When tS is complete and all phases are present with cor- Determined by the system, in case of unloaded neutral, i.e.
rect voltage, the output relays energize and the yellow LED symmetrical load between all three phases, it may happen
R/T glows. that an interruption of the neutral will not be detected.
If the star point is displaced by asymmetrical load in the
Phase sequence monitoring three-phase main, an interrupted neutral will be detected.
If phase sequence monitoring is activated, the output relays
de-energize as soon as a phase sequence error occurs. The Displacement of the star point
fault is displayed by alternated flashing of the LEDs F1 and
F2. The output relays re-energize automatically as soon as the
phase sequence is correct again.

Phase failure detection
The output relays de-energize instantaneous if a phase failure
occurs. The fault is indicated by lightning of LED F1 and flash-
ing of LED F2. The output relays re-energize automatically as
soon as the voltage returns to the tolerance range.

L1, L2, L3 L1, L2, L3 L1, L3, L2 L1, L2, L3 L1, L2 L1, L2, L3 L1 L1, L2, L3 2CDC 252 094 F0207
Measuring value ts L3 L2, L3

15-18
15-16
25-28
25-26
F1: red LED
F2: red LED
R/T: yellow LED

ts = start-up delay fixed 200 ms

CM-MPS.x3, CM-MPN.x2 L1 L1
L2 L2
Automatic phase sequence correction L3 L3
This function can be selected only if phase sequence moni-
toring is activated k and operating mode 2x1 c/o (SPDT) K1 K1
contact j is selected. 15 15
Applying control supply voltage begins the fixed start-up
delay tS1. When tS1 is complete and all phases are present with 18 18
correct voltage, output relay R1 energizes. Output relay R2 16 16
energizes when the fixed start-up delay tS2 is complete and all 2CDC 253 008 F0014
phases are present with correct phase sequence. Output relay 2CDC 253 009 F0014
R2 remains de-energized if the phase sequence is incorrect.
If the voltage to be monitored exceeds or falls below the set 25 25
threshold values for phase unbalance, over- or undervoltage
or if a phase failure occurs, output relay R1 de-energizes and K1 K1
the LEDs F1 and F2 indicate the fault. 28 26 28 26
Output relay R2 is responsive only to a false phase sequence.
In conjunction with a reversing contactor combination, this K1 A1 A1 H1 K1 A1 A1 H1
enables an automatic correction of the rotation direction. See N K2 K3 N K2 K3
circuit diagrams on the right.
A2 A2 A2 A2

Control circuit diagram Control circuit diagram
(K1 = CM-MPS.23) (K1 = CM-MPS.43 or CM-MPN.xx)

L1 L2 L3 2CDC 252 087 F0b07

135

-F1

246

L1, L2, L3 2CDC 252 085 F0207 135 135
Measuring value
-K2 2 4 6 -K3 2 4 6
15-18
15-16 L1, L2, L3 L1, L2 L1, L2, L3 L1, L3, L2
25-28 tS1 L3
25-26 tS2 tS1
F1: red LED tS2
F2: red LED
R/T: yellow LED 154 97 95
98 96
-F2

326

-M1

tS1 = start-up delay of R1 fixed 250 ms W1
tS2 = start-up delay of R2 fixed 200 ms
V1 M

U1 3 ~

Power circuit diagram

2CDC 110 004 C0210 | Catalog Electronic Products and Relays 2015 | ABB 2/36