Fireye BurnerLogiX BLL510, Руководство пользователя

Страница: 36 / 80

36
®
FIGURE 12.
FIGURE 13.
Standby Water
When a steam boiler is operating as the Lag Boiler in a Lead/Lag setup, the BurnerLogix can be pro-
grammed to monitor the boiler water of the Lag steam boiler and bring the boiler on-line when the
boiler water temperature falls below a programmed setpoint. This way, the Lag boiler will be ready
to come online to support the Lead boiler and be ready to generate steam pressure as needed. See
SEQUENCE OF OPERATION - STANDBY WATER section.
ALTERNATE USES FOR LAG2 INPUT
In addition to providing a second lag input on terminal 21, where this is not necessary, the LAG2
input may be user programmed for alternate uses. These alternate uses are
RESET , P-HOLD , I-
HOLD , PROCESS and FRCD ON . Terminal 21 is a line voltage isolated input operating at 120
VAC. These are selected through the BOILER PARMS menus inside the LAG2 sub-menu and are
described as follows:
1.
RESET – Depressing and releasing a reset push button will cause the unit to reset from lockout
or cause the control to shut down the burner and recycle.
80
PSIG
100 PSIG
110 PSI
80
PSI
90
PSI
Lag Boiler Lead Boiler
EXAMPLE 1: The Lead Boiler will attempt to control the steam pressure at 100 PSI. As demand increases and steam pressure drops, the Lag Boiler
will cut in at 80PSI at the low fire position. The Lag Boiler will modulate from low to high fire between 80 PSI (low fire) and 65 PSI (high fire). As
steam pressure rises, the Lag Boiler will cut out at 90 PSI. At 90 PSI, the Lead Boiler is at mid range of its firing rate.
100%
20ma
0%
4ma
LAG SP = 80 PSI
CUT IN = 0 PSI
CUT OUT = 10 PSI
MOD RANGE = 15 PSI
LAG STRT = 0 MIN.
STM SP = 100 PSI
CUT IN = 0 PSI
CUT OUT = 10 PSI
MOD RANGE = 20 PSI
Firing
Rate
65
PSI
HIGH
FIRE
LOW
FIRE
100%
20ma
0%
4ma
Firing
Rate
HIGH
FIRE
LOW
FIRE
BOILER
FIRING
RATE MOTOR
BOILER
FIRING
RATE MOTOR
EXAMPLE 2: The Lead Boiler will attempt to control the steam pressure at 100 PSI. As demand increases and steam pressure drops, the Lag Boiler
will cut in at 80PSI and immediately drive to the high fire position. As steam pressure increases, both boilers will decrease their firing rate. At 105
PSI the Lag Boiler will cut out and not cut in until steam pressure again drops to 80 PSI. The Lead Boiler will cut out at 110 PSI and cut in at its
steam pressure set point (100 PSI).
80
PSI
100 PSI 110 PSI
Lead Boiler
100%
20ma
0%
4ma
STM SP = 100 PSI
CUT IN = 0 PSI
CUT OUT = 10 PSI
MOD RANGE = 20 PSI
Firing
Rate
HIGH
FIRE
LOW
FIRE
80
PSI
100 PSI
105 PSI
Lag Boiler
100%
20ma
0%
4ma
Firing
Rate
HIGH
FIRE
LOW
FIRE
LAG SP = 100 PSI
CUT IN = 20 PSI
CUT OUT = 5 PSI
MOD RANGE = 20 PSI
LAG STRT = 0 MIN.
BOILER
FIRING
RATE MOTOR
BOILER
FIRING
RATE MOTOR