Bruker BVTE3900, Technical Manual

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Technical Manual Version 003 BRUKER 11 (41)
Description of the BVTE3900
The heater is turned on when the relay is closed. When an overheat fault (over-
heating of heater by missing gas flow or safety thermocouple break for example)
occurs the relays turns off and heating is stopped.
The thyristor bridge, for heater power control, is placed on the case with a heat
sink. The voltage delivered to the heater is filtered by a coil to reduce voltage rip-
ple.
On the front panel, a red led lights when the heater is on when using a BVT3000.
Figure 2.2. BVTE3900 power electronics block diagram
Power regulation
HEATER
U x I
TRANSFORMER
THYRISTOR BRIDGE
WITH PHASE
CONTROL
POWER
COMMAND
INPUT RELAY
COMMAND
INPUT
AC LINE
THERMO-
COUPLE
OUTPUT
SAFETY THERMOCOUPLE
HEATER
RELAY
SHUNT A
DC POW-
ER SUP-
PLY