Samlexpower Evolution EVO-2212 Owner's Manual - page 63
62 | SAMLEX AMERICA INC.
SAMLEX AMERICA INC. | 63
Switching of Output Neutral to Chassis Ground Bonding
o 70A rated DPDT Relay K4 is used to switch the bonding of the Output Neutral Connector
(OUTPUT 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
o When Grid / Generator Power is available, relay K4 will be energized and contacts 7 and
9 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
o When Grid / Generator power fails, relay K4 will be de-energized and contacts 7 and 9
will switch over 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)
K2
Transfer Relay (40A) for Grid, Line
K3
Transfer Relay (40A) for Generator, Line
K4
Relay (40A) for Neutral to Ground bond Switching
3, 4
Normally Closed Contacts
4, 5
Normally Open Contacts
QD
Quick Disconnect (13, Fig 3.9) for disconnecting Output Neutral to Chassis Ground bond in
Inverting Mode (Default - connected)
NOTE:
Relays are de-energized in Invertering Mode and are energized in Charging Mode
Fig 4.1(a) Operation of Transfer Relay and Neutral to Ground Bond Switching in EVO-2212 and EVO-2224
SECTION 4 |
General Description & Principles of Operations
NEUTRAL
BI-DIRECTIONAL
TRANSFORMER
LINE
K4
K3
K2
METAL CHASSIS
GROUND OF THE UNIT
3
4
5
3
4 5
3
4 5
INVERTING
CHARGING
OUTPUT
NEUTRAL
GRID
LINE
GRID
GND
GRID
NEUTRAL
GEN
LINE
GEN
GND
GEN
NEUTRAL
OUTPUT
LINE
OUTPUT
GND
QD