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Generator operation
For proper operation of the system it is necessary to
have a generator equipped with an automatic start
function controlled by closing the contact 11-12 of the
SZR-277 controller
In case of incorrect parameters of the main line, the startup
process of the generator is carried out according to the following
scheme: 15 seconds after disconnecting the main line, the 11-12
contacts that start the generator are closed.
Then, for the time Tk, the controller waits for the start and
stabilization of the generator voltage. In case of a proper start-up,
contacts 3-9 are closed and the power supply from the generator is
connected to the receiving line. If the start-up is not completed
correctly, the generator is shut down for a time 3×Tk, followed by
another attempt at start-up. Four consecutive unsuccessful
attempts to start the generator block further attempts to protect
the battery of the generator against discharge.
Resetting of the lock is possible by switching off and on
the controller power supply, short pressing of the lock
resetting button (input 5) or automatically after 3 minu-
tes of correct operation of the main power supply line.
After disconnecting the receiving line from the generator, its ope-
ration is maintained for a time 3×Tk, after which the generator is
switched off (opening of contact 11-12).
The battery connected to terminal 4 is used to power the
controller when there is no main power supply and the generator
has not yet started.
- 5 -
In other cases, the controller is powered from the main line or
generator. If the voltage on the main line is correct, it is also used to
charge the battery.
Mounting
1. Switch off the power supply of the switchgear.
2. Connect the controller according to one of the following diag-
rams. It is recommended to use additional contactors for swi-
tching the power line (diagram 2). In the case of small loads
lower than 16 A (AC-1), the system from scheme 1 can be used.
3. Set the desired controller operation parameters.
4. Switch on the power supply of the switchgear.
Description of leads
1
neutral line (N), common for the generator and the main
power line
2
phase line (L) of the main supply network
3
phase line (L ') from the generator
4
"+" from the battery
5
lock input; closing of the contact between 5 and N
causes an emergency shutdown of all relays, switching
off of the generator and disconnection of the receiving
line
6
input of output voltage control; line switching is possible
if there is no voltage on input 6
WARNING!
The controller can work without a connected control
input, but in this case the protection against gluing
contacts of the actuator relays does not work.
7, 9
power output from the main line and generator
11-12
relay contacts of generator start-up
Connection scheme
connection with load current <16 A (AC-1)
L
generator
12 V
1.2 Ah
N/-
lock
1 2 3
4
5
6
L
L'
START
AL
180
60
5
10
150
210
1
15
5
120
U
(V)
T(s)
T
(s)
min
k
SZR-277
7
8
9 10
11 12
to the load
start of the
generator
2
7
3
9
11
12
- 7 -
connection with contactors at current load >16 A (AC-1)
L'
L
N/-
12 V
1.2 Ah
N/-
lock
1 2 3
4
5
6
L
L'
START
AL
180
60
5
10
150
210
1
15
5
120
U
(V)
T(s)
T
k
(s)
min
SZR-277
7
8
9 10
11 12
2
7
3
9
11
12
- 8 -
generator
L
L'
to the load
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