~ 7 ~
PEF-
321АВР
NOVATEK-ELECTRO
If the tightening torque decreases the connection site heats up, the terminal board may melt and the wire may
flame up. With an increase in the tightening torque, there may be breakage in the thread of the terminal block
screws or pinching in the connected wire.
To improve the operational properties of the product, it is recommended to install circuit breakers in
the 321
АВР power supply circuit rated for current of 0.5 A
.
The option of the 321ABP connection is shown in Figure 3.
If the neutral wires of various inputs are isolated, then contactors with four contact groups must be used. The
measuring circuits of various inputs inside the device are galvanically isolated from each other.
It is recommended for additional protection against simultaneous connection of two inputs, to switch on
additional groups of contacts on the contactors (normally closed) in the power supply circuit of the opposite
inputs (as shown in Fig, 3).
To ensure MODBUS communication in the absence of voltage at two inputs, it is recommended to connect a
12 V 2 A h battery to terminals
39 - 40
.
Attention! When working with the generator, terminals 39
-
40 must get supply from an external
battery.
6.2 Operation of the device
6.2.1
Modes of operation
321
АВР supports 6 operating modes:
– two equivalent three-phase inputs;
– two three-phase inputs with priority
input 1
;
– two three-phase inputs with priority
input 2
;
– three-phase
input 1
and a three-phase generator at
input 2
;
– work only with
input 1
;
– work only with
input 2.
6.2.1.1
With equivalent inputs and with normal voltages at the both inputs, the device connects the load to
input 1
by contactor
K1
.
Fig. 4
– Diagram of
work with equivalent
entries
Figure 4 shows the diagrams of work with equivalent inputs. Detailed description of Figure 4:
1
– Normal voltages are present at
inputs 1 and 2
. The 321ABP connects the load to
input 1
by contactor
K1
.
2
– At input 1, the voltage went beyond the limits set by the user (a failure occurred). The device
disconnects the load from
input 1
by contactor
K1
and counts the transition time to another input
(
«
»
,
table 5).
3
–
After completion of the countdown
«
»
,
the device connects the load to
input 2
by the contactor
K2
.
4
–
Some voltage appeared at
input 1
.
5
– At input 2, the voltage went beyond the limits set by the user (a failure occurred). The device
disconnects the load from
input 2
by the contactor
K2
and counts the transition time to another input
(«
»,
table 5).
6
–
After completion of the
«
»
countdown, the device connects the load to
input 1
by the contactor
K1
.
6.2.1.2
Figure 5 shows the diagrams of work with priority input 1 (Work with priority input 2 is similar).
Fig. 5
– Diagrams of work
with priority
input 1
