BWDK-S201EF Thermostat

Functional combinations
- Basic functions: three-phase tour/maximum value display, fan automatic/manual start/stop, over-temperature alarm, ultra-high temperature trip, sensor failure alarm, black box (status record before power-down), fan timed self-test, analog test, digital compensation, cabinet door open alarm.
- Extended functionality:
- E: 3 independent 4-20 mA analog current outputs
- F: RS-485/RS-232 serial communication (Modbus-RTU)
consequently BWDK-S201EF = Basic function + 4-20 mA output + communication interface for direct access to DCS/SCADA.

technical specification
- Measuring range: -30.0 ℃ ~ 240.0 ℃, resolution 0.1 ℃, accuracy ±1 ℃ (0.5 grade meter + B grade Pt100)
- Operating power: AC 220 V (+10 %/15 %), 50/60 Hz, power consumption ≤ 8 VA
- Contact capacity:
- Fan output AC 220 V/7 A (or AC 125 V/10 A)
- Alarm/trip output AC 220 V/7 A
- Environment: -20 °C to +55 °C, < 95 % RH (25 °C)

Mounting Dimensions
- Panel cutout: 152⁺¹ mm × 76⁺¹ mm
- External dimensions: 160 mm × 80 mm × 120 mm (molded case recessed)

Typical Wiring Terminals (Rear View)
1-2: Over-temperature alarm contact (normally open)
3-4: Ultra-high temperature trip contact (normally open)
5-6: AC 220 V power input
7: Grounding
8: External zero wire
10-12: Parallel connection of 3-6 single-phase active unitsCooling Fans

Factory default temperature setting (adjustable range)
- Fan off T1: 80 °C (50-100 °C)
- Fan start T2: 100 °C (60-110 °C)
- Over-temperature alarm T3: 130 °C (75-165 °C)
- Ultra-high temperature trip T4: 150 °C (90-170 °C)
Settings follow T4 > T3 > T2 > T1+4 °C.

application scenario
- 35 kV and below SC(B) series dry-type transformers
- Data centers, subways, power distribution rooms, box transformers and other occasions requiring remote monitoring or DCS access.

Setup and Commissioning
- Panel 4-key operation, PIN 232 to access menus
- Support analog temperature input self-test, fan timing 0-199 h rust detection
- Black box view of 3 winding temperatures and status before power failure