MASTER HE
SPTMHEE3T16FREN
13
Frequency regulation
The inverter output frequency is generated autonomously by an internal oscillator in synch with that of the by-pass mains;
the frequency stability towards the load therefore depends on the operating conditions:
a) Frequency stability
a. With mains available: the internal oscillator follows the variations in frequency of the by-pass mains,
according to the set value, which is normally ±2% (can be calibrated form ±1% al ±6%).
b. With mains not available: the inverter generates the output current frequency autonomously with a stability
of ±0,05%.
b) Speed of frequency variation
The maximum output frequency variation of the inverter to reach onto that of the backup by-pass mains is 2Hz/s
for the single UPS and 1Hz/s for the parallel version.
Output voltage distortion
The regulation of the inverter guarantees the output voltage distortion with linear loads within 1% (maximum 2% with battery
nearly discharged). With non-linear loads, as defined by standard EN 62040-3, the output voltage distortion does not
exceed 3%.
Output power
The Inverter is sized to supply 100% of active power with nominal load pf 1 in the temperature operating range without
downgrading.
MASTER HE supplies capacitive loads with PF form 1 to 0,9 with no any power downgrading applied.
Overload
The inverter is sized to supply a power overload (kVA) of 110% for 1 hour, 125% for 10 minutes and 150% for 1 minute,
on the three phases. On one phase, the limit is 200% for 6 s.
If the time or power limits are exceeded, the load is transferred onto the by-pass mains.
Short circuit capacity
In the event of a short circuit on the load and with power supply from the battery, the inverter can supply a current limited
to 180% for 1 s in the event of a short circuit on the three phases, and 300% for 1 s in the presence of a short circuit
between phase and neutral.
Symmetry of output voltage
In all conditions, the symmetry output voltage is guaranteed within ±1%, for balanced loads and ±2% for 100% unbalanced
loads (e.g. one phase at nominal load, the other two without load).
Phase displacement
The inverter three phase output voltages are guaranteed with a phase shift angle of 120° ±1° for 100% balanced and
unbalanced loads.
