Power Supply; Analogue Input; Functions - MarelliMotori MEC-20 Manuel Utilisateur

4.1. Power supply

Type 1-phase
❖
From
❖
❖
From 170 to 277Vac ± 10% (@ 50 – 400Hz)
Range
Self-excitation 10Vac
4.2. Sensing
❖
Voltage
❖
❖
Current From 0 to 1Aac (@ 50/60Hz)

4.3. Analogue input

Range 1 From -5 to +5Vdc for a variation from -15% to +15% of the voltage reference
Range 2 Suitable for connection to Power Factor Regulator M50FA400A
1.1kΩ
Input impedance
4.4. Excitation field data
From 3Ω to 20Ω
Resistance
Continuity From 0 to 7 Adc
Forcing 10s From 0 to 15 Adc

4.5. Functions

Soft start Ramp time adjustable from 0 to 60s
❖
Parallel between
❖
generators
❖
Overexcitation
❖
limiting device
10s)
❖
to the characteristic
❖
❖
Under frequency
❖
limiting device
4.6. Accuracy
From 0 to 100% load ±0.5% @ PF 0.8 - balanced and non deforming load and constant frequency
With ±4% engine
±1% @ steady state conditions for load and speed
governing
Steady state ±0.1% @ at constant load and frequency
Thermal drift ±0.5% for a change of 30°C at T
V/Hz ±2%
963857154_U
Mains
Auxiliary winding
Permanent magnet generator (PMG)
1-phase, 2 terminals
3-phases, 3 terminals
From 220Vac to 480Vac ± 10%, @ 50/60Hz
Type: Reactive droop compensation
Droop: from 0 to 15%
Type: Inverse time characteristic
1 maximum fixed threshold of 15A, above which de-energizing occurs (after about
1 minimum settable threshold, above which the limiting device operate according
1 open collector output per signal
Corner frequency adjustable from 40 to 60 Hz
Zero Volt frequency adjustable from 0 to 40 Hz
in 10 minutes
AMB
23