The unit is designed for continuous monitoring of three-phase electrical equipment parameters (primarily 3-phase asynchronous induction electro motors):
• mains voltage, phase/line RMS currents,
• wattage,
• positive and negative sequence voltages and currents,
• isolation resistance to frame,
• differential ground leak currents (zero sequence currents),
• temperature operation modes.
The unit has been designed for wide range of applications in the buildings engineering systems (heating, ventilation, water supply, air-conditioning), Automatic Process Control Systems and industrial automation systems, systems of control, accounting and scheduling.
It is equipped with complete set of protections implemented in UBZ-301 version. It additionally provides protection against long lasting start and rotor blockage, as well as motor winding overheating monitoring with use of temperature sensors.
Availability of another output relay allows for an additional operation mode:
• wye-delta switching;
• «delayed start» power-on (for example, cascade motor energizing);
• remote signaling system relay.
General specification
| Purpose of device | Control and distribution equipment. Asynchronous
motor protection control. |
| Assembly (mounting) type | mounted on standard 35 mm DIN bar |
Protection degree:
- device
- terminal block |
IP40
IP20 |
| Climate zone category | N3.1 (moderate, indoors) |
| Operating temperature range | from - 35 to +55 °C |
| Storage temperature | from - 45 to +70 °C |
| Pollution degree | III |
| Overvoltage category | III |
| Diameter of adapters on terminals | 0.5-2 mm² |
| Maximum torque of terminal screws | 0.4 N*M |
Technical Specifications
| Rated supply voltage: three-phase | 380 V 50 Hz |
| Mains frequency, Hz | 48-62 |
| Rated currents range (when using integrated current transformers), A | 5-63 |
| Voltage hysteresis, (phase/line), V | 10/17 |
| Thermal hysteresis, % of accumulated heat at shutdown | 33 |
| Current tripping threshold detection accuracy, % of rated current, ≤ | 2 |
| Voltage tripping threshold detection accuracy, V, at least | 3 |
| Voltage based phase imbalance detection accuracy, V, at least | 3 |
Minimum operational voltage:
- single-phase voltage power supply, with connected neutral wire, V, at least
- three-phase power supply voltage, V, no more than |
180
450 |
Main outputs:
- load relay – two groups of changeover contacts for motor starter control - 8A, 250V at cos φ=1;
- functional relay – one group of changeover contacts - 16 A, 250 V at cos φ=1 (relay function assigned by the user) | |
Analog inputs:
- two analog inputs for temperature sensors (type Pt100, Ni100,Ni120)
- analog input for sensor with 0-10 V output
- analog input for sensor with 4 mA (0mA) – 20 mA output
- three analog inputs for standard CT with 5A output (type T-0.66 or similar)
- input for differential current transformer (zero sequence transformer) | |
| Temperature sensor resolution, °C | 1 |
| Power consumption (under load), VA, no more than | 5.0 |
| Weight, kg, no more than | 0.5 |
| Dimensions - nine S type modules | 86 х 156.5 х 56.8 mm |
| Mounting – on a standard 35 mm DIN bar |
| Mounting position – any |
Characteristics of output terminals of integrated relays
| Relay | Operation mode | Max. current at U~250 V | N of tripping х1000 | Max. commutated power | Max. additional alternating voltage | Max. current at Uconst=30 V (N of tripping) |
|---|
functional
relay | cosφ = 0.4
cosφ = 1.0 | 5 A
16 A | 100 | 4000 VA | 440/300 V | 3 A |
| load relay | cosφ = 0.4
cosφ = 1.0 | 2 A
8 A | 100
100 | 1000 VA | 460 V | 3 A (50000) |
Dimensions
