52
®
If the M-8 circuit is not closed at the beginning of a cycle, the top line of a display will switch to
PURGE 10 seconds.
6.
When the prepurge is completed, the firing rate motor is driven toward the low purge damper
position (10-12 circuit made). The BLV512 will display:
7.
Following the minimum 30 second delay (to permit the firing rate motor to get to the low fire
position), the control will wait for the low fire switch (M-D) to close. When it closes, the trial for
ignition sequence will start. If after ten minutes, the M-D circuit is not closed, the control will
lockout unless selected to wait indefinitely.
8.
The trial for ignition period begins with Terminals 5, 6 and W being energized simultaneously.
This is known as PTFI (Pilot Trial for Ignition). The BLV512 will display:
Unless otherwise selected this period is ten seconds in duration. Terminal W will de-energize after 5
seconds. Refer to PTFI*MTFI TIMINGS to determine times selected or timings appropriate for the
application. The test meter jacks on the ZB110 will provide an indication of the flame signal
strength. The flame signal readout is also available on the alpha-numeric display.
9.
With flame proven at the end of PTFI, the main flame trial for ignition (MTFI) period begins.
Terminal 7 is energized. The BLV512 will display:
Terminal 5 is de-energized 10 seconds later and Terminal 6 is de-energized after another 5 seconds.
10.
The firing rate motor is now sent to the automatic modulation position (10-11 circuit made) and
is under the command of the proportional controller. The BLV512 will display:
PURGE 00:10
HIGH FIRE PURGE
PURGE
00:24
LOW FIRE PURGE
PTFI 00:02
IGNITION TIMING
MINIMUM ACCEPTABLE 6mA
6-16
NORMAL
7.5 -20mA
20-80
TEST JACKS
DISPLAY
PTFI 20
FLAME SIGNAL
MTFI
35
FLAME SIGNAL
AUTO 40
FLAME SIGNAL
Содержание BurnerLogiX BLL510
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