Temperature Set Points; Figure 4.1: Over Temperature Operation - Advanced Power technologies TTC-1000 Instruction & Operation Manual

4.6 Temperature Set Points

The TTC-1000 has four independent temperature set points per temperature
probe and each probe has four calculated winding set points associated with it if
used with a CT and the options for winding temperature calculation are set. Each
set point has its own pick up and drop out temperatures. The pick up and drop
out temperature can be set at different temperatures and allows the controller to
operate as either an under or over temperature controller. The following two
equations describe how the controller reacts depending on the setting of the pick
up and drop out temperature for liquid temperature probes:
If SPpn Pick UP > = SPpn Drop Out then operate as over temperature
If SPpn Pick UP < SPpn Drop Out then operate as under temperature
Where: p = Probe # (1, 2 or 3) & n = Set point # (1, 2, 3, 4)
The equations for winding temperature pickup and drop temperatures are:
If WSPn Pick UP > = WSPn Drop Out then operate as over temperature
If WSPn Pick UP < WSPn Drop Out then operate as under temperature
Where: n = Set point # (1, 2, 3, 4)
The over temperature set point is ideal for handling the pickup of fans or pumps
as well as generating over temperature alarms and trip signals. The under
temperature feature is useful to block the operation of pumps at low
temperatures.
Figure 4.1 and 4.2 show when the SP picks up and drops out for when the
controller is configured to operate in the over and under temperature modes
respectively.
Figure 4.1: Over
Temperature
Operation
Temperature
SPpn Pick Up
Temperature
SPpn Drop Out
Temperature
SPpn
42
Time
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