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4.2 ELECTRICAL CONNECTION TO THE TERMINAL STRIP
(installer-set)
P 140 - 200 - 300 T/G
DIRECT MOTOR STARTING
(A)
P 300 - 450 T/G
STAR-DELTA MOTOR STARTING
(B)
THERMAL RELAY
(C)
NOTE:
Check the lock-out by darkening the
photo-cell after removal of the cover.
ATTENTION: HIGH VOLTAGE
LAYOUT (A) - Electrical connection P 140-200-300 T/G
burners with direct motor starting
P 140 T/G
230 V
400 V
F
A
25
L
2
2,5
mm
LAYOUT (B) - Electrical connection P 300-450 T/G burners
with star-delta motor starting
F
L
LA
KEY TO LAYOUTS (A) - (B)
IN - Burner manual stop switch
MA - Star-delta starter terminal strip
MB - Burner terminal strip
S - Remote lock-out signal
TL - Load limit remote control system:
shut down the burner when the boiler
temperature or pressure reaches the
maximum preset value
TS - Safety load control system:
operateds when TL is faulty
nd
T2 - 2
rd
T3 - 3
SCHEMA (C) - Calibration of thermal relay
This is required to avoid motor burn-out in the
event of a significant increase in power
absorption caused by a missing phase.
• If the motor is star-powered, 400 V, the cursor
should be positioned to "MIN".
• If it is delta-powered, 230 V, the cursor should
be positioned to "MAX".
If the scale of the thermal relay does not include
rated motor absorption at 400 V, protection is
still ensured.
43
Cables cross-section
P 200 T/G
230 V
400 V
230 V
25
35
25
2,5
4
2,5
Cables cross-section
P 300 T/G
230 V
400 V
230 V
A
50
35
2
6
4
mm
2
4
2,5
mm
stage load control system
stage load control system
P 300 T/G
400 V
63
50
6
4
P 450 T/G
400 V
63
50
10
6
6
4
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