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Temperature Integral Gain
T_KI
Integral gain factor for discharge air temperature
1
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.
Temperature Derivative
T_KD
Derivative gain factor for discharge air
0
Gain
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.
Minimum Velocity Limit,
MIN_VEL_LIM
Defines minimum allowable velocity pressure
200 FPM
Two Speed Fan
(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
drops below the Minimum Velocity Limit.
Minimum Velocity
MIN_VEL_DEL
Defines length of time velocity pressure
3 seconds
Time Delay,
is allowed to be below Minimum Velocity
Two Speed Fan
Limit while fan output is energized before an
alarm is generated (see
Minimum Velocity Limit
functional description).
Range = 0-60 seconds.
Low To High Speed Fan
LO_HI_SWITCH
Defines velocity pressure setpoint at which
400 FPM
Switch Setpoint
low speed fan will de-energize and high speed
fan will energize.
Range = 100-600 feet per minute.
High To Low Speed Fan
LO_HI_HYSTER
With high speed fan energized, this setpoint
50 FPM
Hysteresis
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.
High to Low Speed Fan
HI_LO_TIME
Defines length of time after high speed fan has
10 sec-
Time Delay
de-energized before low speed fan is energized.
onds
Range = 0 to 30 seconds.
Return Fan
RET_CFM_OFFSET Defines the Return Fan Air Flow Setpoint as a
80
CFM Offset
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.
PM7600B
PM7600B INPUT AND OUTPUT OPTIONS
SETPOINT PARAMETERS (continued)
Rec-
ommended
Variable Name
Variable Label
Functional Description/Program Options
Value