Samlexpower Evolution EVO-2212 Owner's Manual page 66

SECTIOn 4 |
Switching of hot output (outPut line)
70A rated DPDT relays K2 and K3 are used to switch the hot Output Connector (outPut line) to
o
either the Inverter Section or to the Grid / Generator. Please note that in this relay, each of the 2 poles is
rated for 35A. The 2 poles are used in parallel to increase the contact current carrying capacity to 70A
When Grid / Generator Power is available, relays K2 or K3 will be energized and contacts 7
o
and 9 will switch over to contacts 4 and 6 respectively (Grid has PrIOrITy over Generator if
both are present simultaneously). The bidirectional Transformer works as a battery Charger.
The hot AC input from the Grid (GrID LINE) or from the Generator (GEN LINE) is fed to the
hot input of the bi-directional Transformer for battery charging and at the same time, it is
passed through to the hot Out (OuTPuT LINE) for powering the AC loads
When Grid / Generator power fails, relays K2 / K3 will be de-energized and contacts 7 and 9 will
o
switch back to contacts 1 and 3 respectively. Output from the Inverter Section is fed to the bi-
directional Transformer and onwards to the hot Out (OuTPuT LINE) for powering the AC loads
Switching of bonding of output neutral to chassis ground bonding
70A rated DPDT relay K4 is used to switch the bonding of the Output Neutral Connector (OuT-
o
PuT NEuTrAL) to the chassis of the unit. Please note that in this relay, each of the 2 poles is rated
for 35A. The 2 poles are used in parallel to increase the contact current carrying capacity to 70A
When Grid / Generator Power is available, relay K4 will be energized and contacts 7 and 9
o
will switch over to contacts 4 and 6 respectively. Neutral input from the Grid (GrID NEuTrAL)
or from the Generator (GEN NEuTrAL) is fed to the Neutral input of the
bi-directional Transformer for battery charging and at the same time, it is passed through to
the output Neutral (OuTPuT NEuTrAL) for powering the AC loads. Please note that in this
condition, the Output Neutral (OuTPuT NEuTrAL) is isolated from the chassis of the unit
When Grid / Generator power fails, relay K4 will be de-energized and contacts 7 and 9 will
o
switch back to contacts 1 and 3 respectively. Neutral output from the Inverter Section is fed
the Neutral of the bi-directional Transformer and onwards to the output Neutral (OuTPuT
NEuTrAL) for powering the AC loads. At the same time, the output Neutral (OuTPuT
NEuTrAL) gets bonded to the chassis of the unit through the mated contacts of the
Insulated Quick Disconnect "QD" located in the AC Wiring Compartment (13, fig 3.9)
NEUTRAL
INVERTING
CHARGING
BI-DIRECTIONAL
TRANSFORMER
LINE
fig 4.1(a) operation of transfer relay and neutral to ground bond Switching of evo-2212 and evo-2224
66 | SAMLEX AMErICA INC.
general Description & Principles of Operations
K4
3
4
5
K2
3
4
5
K3
3
4 5
(See legend on the next page 67)
QD
METAL CHASSIS
GROUND OF THE EVO
GEN OUTPUT GRID GEN
LINE LINE LINE GND
OUTPUT GRID GEN OUTPUT
GND GND NEUTRAL NEUTRAL
GRID
NEUTRAL