Specifications

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der.t – (2.0) Derivative Time in seconds.
The derivative time, in combination with the dAC, is responsible for keeping the
environment moving toward the set-point, following a pre-determined curve (set
by the dAC in combination with the bAnd). The curve is followed to help avoid
set-point overshoots.
Shortening the derivative time will cause the controller to recover slowly from
disturbances. Lengthening the derivative time may cause oscillations.
dAC – (1.0) Recommended. The Derivative Approach Control determines how
quickly the unit will reach the set- point, without overshooting. The dAC creates a
gently sloping, exponential curve that the system must follow when approaching
the set-point. The smaller the number, the quicker the unit will allow the set-point
to be reached. The dAC multiplied by the band determines where the beginning
of the approach curve will be located. A larger dAC setting will cause the
beginning of the dAC curve to be further away from the set point. The larger
setting will control overshoots better, but will cause responses to disturbances to
be slower.
CYC.t – (1.0) Recommended. Cycle time means how often the unit can
potentially be turned on and then off in succession. The ETS Model 562 and
Model 572 Humidifiers may each be safely turned on and off once a second. DO
NOT DECREASE CYCLE TIME BELOW 1.0 SECOND when operating these
systems.
The shorter the cycle time, the greater the degree of precision that may be
achieved with the controller.
If using any other humidification system, determine the minimum cycle time at
which the unit can safely operate (consult the manufacturer’s instructions for the
unit).
oFSt – (0.0) Do Not Change. The Offset / Manual Reset control is only usable
when the integral time (int.t) is turned off. Since the integral time is being used,
the offset control may be ignored.
SP.LK – (oFF) Locks the set-point preventing unauthorized adjustment.
SP2 OPERATING PARAMETERS
The SP2 parameters can be configured in a variety of ways. In the Model 518
Humidity Controller, the SP2 parameters are used to tailor the Dehumidification
System output for best RH control.