Honeywell PM7600B Manual page 16

PM7600B
PM7600B INPUT AND OUTPUT OPTIONS
SETPOINT PARAMETERS (continued)
Variable Name
Temperature Integral Gain
Temperature Derivative
Gain
Minimum Velocity Limit,
Two Speed Fan
Minimum Velocity
Time Delay,
Two Speed Fan
Low To High Speed Fan
Switch Setpoint
High To Low Speed Fan
Hysteresis
High to Low Speed Fan
Time Delay
Return Fan
CFM Offset
63-4309—2
Variable Label Functional Description/Program Options
T_KI Integral gain factor for discharge air temperature
control. Integral gain factor responds based on
length of time that discharge air temperature has
deviated from discharge air temperature setpoint
Range 0 to 10.
T_KD Derivative gain factor for discharge air
temperature control. Derivative gain factor causes
temperature control output of W7600 to respond
based on rate of change of discharge air
temperature.
Range 0 to 10.
MIN_VEL_LIM Defines minimum allowable velocity pressure
(S_VEL) when fan digital output is energized.
If velocity pressure is below Minimum
Velocity Limit for longer than Minimum
Velocity Time Delay, W7600 will turn on
Alarm digital output, turn off all other outputs,
send an alarm message to S7600 and disable the
control.
Range = 100-300 feet per minute.
NOTE: W7600 must be reset if Velocity Pressure
MIN_VEL_DEL Defines length of time velocity pressure
is allowed to be below Minimum Velocity
Limit while fan output is energized before an
alarm is generated (see Minimum Velocity Limit
functional description).
Range = 0-60 seconds.
LO_HI_SWITCH Defines velocity pressure setpoint at which
low speed fan will de-energize and high speed
fan will energize.
Range = 100-600 feet per minute.
LO_HI_HYSTER With high speed fan energized, this setpoint
defines the amount of velocity pressure below
Low to High Speed Fan Switch Setpoint that
velocity pressure sensor must sense before high
speed fan will de-energize. After High to Low
Speed Fan Time Delay has elapsed, low speed
fan will energize.
Range = 20-100 feet per minute.
HI_LO_TIME Defines length of time after high speed fan has
de-energized before low speed fan is energized.
Range = 0 to 30 seconds.
RET_CFM_OFFSET Defines the Return Fan Air Flow Setpoint as a
percentage of Supply Fan Air Flow. For example, if
supply air is 4000 CFM, and the RET_CFM_
PFFSET is 80%, Return Air Setpoint is 3200 CFM
(80% or 4000 CFM). Available range is 0.0 to 100%.
Applicable to PM7600B, Version 2.0 or later.
drops below the Minimum Velocity Limit.
16
Rec-
ommended
Value
1
0
200 FPM
3 seconds
400 FPM
50 FPM
10 sec-
onds
80