Electrical Connection To The Terminal Strip - Riello P 140 T/G Installation, Use And Maintenance Instructions

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 25
L 2 2,5 2,5
mm
LAYOUT (B) - Electrical connection P 300-450 T/G burners
with star-delta motor starting
F A
L
mm
LA
mm
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 stage load control system
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 ÒMINÓ.
¥ If it is delta-powered, 230 V, the cursor should
be positioned to ÒMAXÓ.
If the scale of the thermal relay does not include
rated motor absorption at 400 V, protection is
still ensured.
8
Cables cross-section
P 200 T/G P 300 T/G
230 V 400 V 230 V
35 25 63
4 2,5 6
Cables cross-section
P 300 T/G P 450 T/G
230 V 400 V 230 V
50 35 63
2 6 4 10
2 4 2,5 6
stage load control system
400 V
50
4
400 V
50
6
4