This is an obsolete product, no longer available for purchase.
The Model 556 is an Automatic Transfer switch and Mains controller with comprehensive
instrumentation and load control features.
The module is used to monitor a mains supply and automatically start and stop the system’s generating sets (controlled by DSE 550 load sharing controllers). It indicates the operational status by means of an
LCD display, and LEDs on the front panel.
The system is used to ‘manage’ the generator bus, which is fed by DSE 550 load sharing controllers.
The 556 instructs the 550 controllers to make precise changes to the generating set outputs which can be used in many applications including Peak lopping.
The generating sets are used to ensure the mains load is kept below a specific, configurable level.
No-break return to mains supply. The generator bus is voltage matched and synchronised with
the returned mains supply to allow transfer back to mains with no break in supply to the load.
Selected operational sequences, timers and alarms can be altered by the customer. Alterations to the
system are made using the 810 interface and a PC. This interface also provides real time diagnostic
Operation of the module is via pushbutton controls (with security locking facility) mounted on the front
panel with STOP/RESET, AUTO, TEST, MANUAL and START functions. The first four pushbuttons
feature LED ‘selected’ indications.
Further pushbuttons provide MUTE/LAMP TEST, LCD PAGE and DISPLAY SCROLL functions.
The module features 32-Bit Microprocessor control and a comprehensive list of timers and preconfigured sequences. User configurable expansion facilities are also provided.
The 556 module provides the following instrumentation LCD displays, accessed via the LCD PAGE and DISPLAY SCROLL push buttons:
Mains Volts L1-N, L2-N, L3-N
Mains Volts L1-L2, L2-L3, L3-L1
Mains Amps L1,L2,L3
Mains Frequency Hz
Mains kVA L1,L2,L3, Total
Mains kW L1,L2,L3, Total
Mains pf L1,L2,L3,Average
Mains kVAr L1,L2,L3, Total
Mains KWh, KVAh, KVArh
Mains Phase Sequence
Bus Volts L1-N, L2-N, L3-N
Bus Volts L1-L2, L2-L3, L3-L1
Bus Frequency Hz
Bus kW total and % of capacity
Bus kVAr total and % of capacity
Bus Phase Sequence
CONTINUOUS VOLTAGE RATING
8V to 35V Continuous.
Able to survive 0V for 50mS, providing supply was at least 10V before dropout and supply recovers to 5V. This is achieved without the need for internal batteries.
MAXIMUM OPERATING CURRENT
513mA at 12V. 263mA at 24V.
MAXIMUM STANDY CURRENT
370mA at 12V. 210mA at 24V.
GENERATOR BUS INPUT RANGE
15V(L-N) to 277V(L-N) AC (+20%)
GENERATOR BUS INPUT FREQUENCY
50Hz - 60Hz at rated engine speed
(Minimum: 15V AC L-N)
MAINS SENSING INPUT RANGE
15V(L-N) to 277V(L-N) AC (+20%)
MAINS SENSING INPUT FREQUENCY
50Hz - 60 Hz (Minimum: 15V AC L-N)
AUXILLIARY RELAY OUTPUTS
5 Amp DC at supply voltage.
GENERATOR BUS LOADING RELAY OUPUT
8 Amp AC 250V – normally open.
MAINS LOADING RELAY OUTPUT
8 Amp AC 250V – changeover
192mm x 144mm x 162.5mm
(7.6” x 5.7” x 6.4”)
185mm x 138mm (7.3” x 5.5”)
BS EN 61000-6-2
EMC Generic Immunity Standard for
the Industrial Environment
BS EN 61000-6-4
EMC Generic Emission Standard for the Industrial Environment
BS EN 60950
Safety of Information Technology Equipment, including Electrical Business Equipment
BS EN 60068-2-1
Ab/Ae Cold Test -30 °C
BS EN 60068-2-2
Bb/Be Dry Heat +70 °C
BS EN 60068-2-6
Ten sweeps in each of three major axes
5 Hz to 8 Hz @ +/-7.5 mm,
8 Hz to 500 Hz @ 2 gn
BS EN 60068-2-30
Db Damp Heat Cyclic 20/55 °C
@ 95% RH 48 Hours
BS EN 60068-2-78
Cab Damp Heat Static 40 °C
@ 93% RH 48 Hours
BS EN 60068-2-7
Three shocks in each of three major axes
15 gn in 11 mS
DEGREES OF PROTECTION
PROVIDED BY ENCLOSURES
BS EN 60529
IP65 - Front of module when installed into the control panel with the supplied sealing gasket.