GF Welding Weld334m - Setting the External Synchronism

Weld334m - User’s manual
21
Power feeder type F370-PSM
Temperature
* (°C)
20° 40° 50° 60°
Current (A) 2.5 2.03 1.8 1.58
* Characteristics refer to the operating temperature of the component itself.
3.4 Setting the external synchronism
For the firing pulse to the SCRs to be synchronised with the mains of the SCRs, the two
jumpers for the line synchronism must be set on the card.
Line synchronism selection jumpers (internal/external)
PS
F350 PSM
1. When the control device is powered from the a.c. mains taken directly
from the power line of the SCRs, jumpers are to be set to PWR-RTN,
(standard configuration).
2. If the synchronism signal is to be taken directly from the power group
through an attenuation/insulation transformer, the jumpers are to be set
on S1-S2. This configuration is compulsory when the device is powered
from the d.c. mains.
NOTE: The secondary of the insulation transformer is not to be
earthed
Example of connection for the external synchronism
WELD334m
PS
1
2
3
4
P21
Firing device
SCR
1
2
Vdc power supply or Vac
privileged
Insulation tranformer
Welding tranformer
380Vac line
Power supply
External
synch
Pulse
control
12-33Vac
PWR RTN
S1 S2
PWR RTN
S1 S2