Page 96 - EPR Catalog 2015

Three-phase monitoring relays
Benefits and advantages, Applications

Characteristics of the CM range three-phase monitors Extended functionality
ABB’s new generation of three-phase monitoring relays feature
– Adjustable phase unbalance threshold value 1) additional functions making the application field for the de-
vices considerably larger.
– Adjustable ON-delay/OFF-delay time 1)
Selectable phase sequence monitoring
– Dual frequency measuring 50/60 Hz The phase sequence monitoring can be switched off by
means of a rotary switch or a DIP switch. This enables moni-
2 – Powered by the measuring circuit toring of three-phase mains where phase sequence is not
relevant for the application, for example in case of motors with
– 1 n/o contact, 1 or 2 c/o contacts forward and reverse rotation, heating applications, etc.

– LEDs for the indication of operational states Automatic phase sequence correction
The automatic phase sequence correction is activated by
– Multifunctional and single-functional devices means of a DIP switch. With activated phase sequence
correction, it is ensured that for any non-fixed or portable
– Phase failure detection equipment, e.g. construction machinery, the correct phase
sequence is always applied to the input terminals of the load.
– Phase sequence monitoring 1) For details regarding the wiring, please see function descrip-
tion / diagrams.
– Over- and undervoltage monitoring (fixed or adjustable)1)

– Wide-range operating voltage guarantees world-wide operation

– Approvals / Marks a b2)
AC RK E /

1) depending on device type
2) Applicable in rail application following the latest standards for rail applications: NF

F 16-101/102 (I2/F2 classified), EN 45545 (Hazard Level 3), DIN 5510, EN 50155,
IEC 60571. Further information is available in our rail segment brochure
2CDC110084B0201.

Phase unbalance monitoring Structure of the type designation
If the supply by the three-phase system is unbalanced due to CM-_ _ x.yz
uneven distribution of the load, the motor will convert a part of x: width of enclosure
the energy into reactive power. This energy gets lost unex- y: Control supply voltage / measuring range
ploited; also the motor is exposed to higher thermal stress.
Other thermal protection devices fail to dete ct continuing 1 110, 115, 120, 127 V supply systems (phase-
unbalances which can lead to damage or destruction of the neutral)
motor. The CM range three-phase monitors with phase unbal-
ance monitoring can reliably detect this critical situation. 2 220, 230, 240 V supply systems (phase-neutral)
3 200, 208, 220, 230, 240, 257, 260 V supply sys-
Phase sequence
Changing the phase sequence during operation or a wrong tems (phase-phase)
phase sequence prior to startup causes a change of the rota- 4 440, 460 V supply systems (phase-phase)
tional direction of the connected device. Generators, pumps 5 480, 500 V supply systems (phase-phase)
or fans rotate in the wrong direction and the installation is no 6 575, 600 V supply systems (phase-phase)
longer working properly. Especially for moveable equipment, 7 660, 690 V supply systems (phase-phase)
such as construction machinery, phase sequence detection 8 200, 400 V supply systems (phase-phase)
prior to the startup process is highly reasonable.
z: Rated frequency / output circuit
Phase loss
In case of phase loss, undefined stats of the installation are 1 50/60 Hz – 1x2 c/o
likely to occur. E.g. the startup process of motors is disturbed. 2 50/60 Hz – 1x2 or 2x1 c/o
All three-phase monitors of the ABB CM range detect a phase 3 50/60/400 Hz – 1x2 oder 2x1 c/o
loss as soon as the voltage of one phase drops below 60% of
its nominal value.

Voltage monitoring
All electric devices can be damaged when operated continu-
ously in a network with out-of-range voltages. For example,
safe starting is not ensured in case of undervoltage. Also,
the switching state of a contactor is not clearly defined when
operated in a „forbidden“ voltage range. This can lead to un-
defined states of the installtion and cause damage or destruc-
tion of valuable parts.

2/29 ABB | Catalog Electronic Products and Relays 2015 | 2CDC 110 004 C0210