Input frequency range
Input frequency range accepted by the MultiPlus-II. The MultiPlus-II synchronises within this range with the AC input frequency.
The output frequency is then equal to the input frequency.
Adjustability: 45 – 65 Hz; 45 – 55 Hz; 55 – 65 Hz
Input voltage range
Voltage range accepted by the MultiPlus-II. The MultiPlus-II synchronises within this range with the AC input. The output voltage
is then equal to the input voltage.
Adjustability:
Lower limit: 90 – 120 V
Upper limit: 120 – 140 V
The standard lower limit setting of 90V/180V is intended for connection to a weak mains supply, or to a
generator with unstable AC output. This setting may result in a system shut down when connected to a
‘brushless, self excited, externally voltage regulated, synchronous AC generator’ (synchronous AVR
generator). Most generators rated at 10kVA or more are synchronous AVR generators. The shut down is
initiated when the generator is stopped and revs down while the AVR simultaneously ‘tries’ to keep the output
voltage of the generator at 120V/230V.
The solution is to increase the lower limit setting to 110/220VAC (the output of AVR generators is generally very stable), or to
disconnect the MultiPlus-II from the generator when a generator stop signal is given (with help of an AC contactor installed in
series with the generator).
Inverter voltage
Output voltage of the MultiPlus-II in battery operation.
Adjustability: 110 – 130 V
Stand-alone / parallel operation / 2-3 phase setting
Using several devices, it is possible to:
• increase total inverter power (several devices in parallel)
• create a split-phase system with a separate autotransformer: see VE autotransformer datasheet and manual.
• create a 3-phase system.
The standard product settings are for standalone operation. For parallel, three-phase or split phase operation see section 5.3.
AES (Automatic Economy Switch)
If this setting is turned ‘on’, the power consumption in no-load operation and with low loads is decreased by approx. 20%, by
slightly 'narrowing' the sinusoidal voltage. Applicable in stand-alone configuration only.
Search Mode
Instead of the AES mode, the
search mode
can also be chosen. If search mode is ‘on’, the power consumption in no-load
operation is decreased by approx. 70%. In this mode the MultiPlus-II, when operating in inverter mode, is switched off in case of
no load or very low load, and switches on every two seconds for a short period. If the output current exceeds a set level, the
inverter will continue to operate. If not, the inverter will shut down again.
The Search Mode ‘shut down’ and ‘remain on’ load levels can be set with VEConfigure.
The standard settings are:
Shut down: 40 Watt (linear load)
Turn on: 100 Watt (linear load)
Ground relay (see appendix B)
With this relay, the neutral conductor of the AC output is grounded to the chassis when the back feed safety relays are open.
This ensures the correct operation of earth leakage circuit breakers in the output. If required an external ground relay can be
connected (for a split-phase system with a separate autotransformer). See appendix A.
Battery charge algorithm
The standard setting is ‘Four-stage adaptive with BatterySafe mode’. See Section 2 for a description.
This is the recommended charge algorithm for lead acid batteries. See the help files in the software configuration programs for
other features.
Battery type
MultiPlus-II 48V 3kVA 120V
Page 17
Configuration
