ECO In
ECO Out
ESD In
ESD Out
Copyright © 1996 - Bebco Industries, Incorporated - All Rights Reserved
Operation Control Features
FIELD-ADJUSTABLE
PRESSURE & ALARM SETPOINTS
PFS - (Primary Fan Speed) Adjusts primary fan speed to
set desired pressure. CW (Clockwise) to decrease.
Factory setpoint:
0.25"
Normal range of adjustment:
0.10" to 0.40"
ASP - (Alarm Setpoint) Adjusts alarm setpoint to activate
alarm at desired pressure. CW (Clockwise) to decrease.
Factory setpoint:
0.15"
Normal range of adjustment:
0.05" to 0.25"
FIELD-ADJUSTABLE
SECONDARY FAN & ALARM DELAYS
SFD - (Secondary Fan Delay) adjusts time delay cycle to
prohibit secondary fan from engaging when pressure falls
below alarm setpoint.
Factory setpoint:
0 seconds
Normal range of adjustment:
0-35 seconds
ASD - (Alarm Signal Delay) adjusts time delay cycle to
prohibit alarm relay from deenergizing when pressure falls
below alarm setpoint.
Factory setpoint:
15 seconds
Normal range of adjustment:
0-35 seconds
Notes: Time delay cycles reset automatically if "safe"
building pressure is restored before cycles end.
All controls permit real-time adjustment.
Emergency Remote Control
OPTIONAL USER INPUTS
ESD - (Emergency Shutdown) When VFD Interface Board
jumper is installed, unit allows user to remotely disengage
primary and secondary fans, regardless of primary and
secondary fan control switch positions.
Typical input devices: emergency shutdown switches, fire
extinguishing or alarm systems and stack mounted
combustible gas or hydrogen sulfide sensors.
ECO - (Emergency Control Override) When VFD Interface
Board jumper is installed, unit allows user to remotely
engage primary and secondary fans, regardless of primary
and secondary fan control switch positions.
Typical input devices: control room mounted combustible
gas, hydrogen sulfide, or oxygen deficiency sensors.
OPTIONAL WIRING METHODS
HW - (Hard Wiring) Selection of this option requires the
use of conduit, seals and wiring approved for the location.
IS - (Intrinsically Safe) Selection of this option allows use
of intrinsically safe cabling approved for the location.
NOTE: Loops are self-powered 5 VDC 20 ma signals,
regardless of wiring method selection. Signals
must be maintained independently by normally
closed switches to prevent shutdown or override.
PRIORITY SELECTION SWITCH
In cases where both optional inputs are utilized, VFD
Interface Board jumper allows user to select the preferred
action (shutdown or override) in the unlikely event of
simultaneous loss of signal. When VFD Interface Board
priority (PTY) jumper is installed, priority is given to the
Emergency Control Override function.
See rear cover for ESD & ECO input ordering information.
VFD Interface Card
Explosion Proof
Control Enclosure Door
Electrical Field Wiring Diagrams
Transducer
Interface
Cable Header
ESD & ECO
Interface
Cable Header
Microprocessor
Door Card
Interface
Cable Header
ECO Enable Pin
ESD Enable Pin
Priority Select Pin
Alarm Relay
20 Amp T1 & T2
Output Fuses
Sec. Fan Relay
Alarm Relay
Terminals
Explosion Proof
Control Enclosure
Variable
Frequency Drive
VFD Interface
Card
Control Operators
& Indicators
Operator Wiring
Cable Interface Card
VFD
Interface
Cable Header
Alarm Signal
Delay Timer
(ASD)
Primary Fan
Speed Control
(PFS)
Alarm Setpoint
Control
(ASP)
Secondary Fan
Delay Timer
(SFD)
Transformer
1 Amp L1
Input Fuse
220 VAC Power
In (Gnd, L1 & L2)
Secondary Motor
Output (T1 & T2)
Intrinsically
Safe Version
Optional ESD & ECO Inputs
1
2
3
4
ESD Out
ESD In
ECO Out
ECO In
Hard Wire
Version
AC Power & Primary Fan
VFD Controller Terminal - TM2
L2
(hot)
L1
(hot)
T1
T2 T3
Unit Power In
208-240 VAC
Power Out
to DS-1
Primary Motor
Disconnect Switch
Alarm Relay & Secondary Fan
VFD Interface Card Terminal - P4
NC
C
NO
T1
T2
Power out
to DS-2
Secondary
Motor
Disconnect
Switch
Alarm Relay
Contacts
15 amps @ 120 VAC
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
Normally
Closed
Contacts