Agilent Technologies TV70 Navigator 969-8970, User Manual

Page: 158 / 182

18
Technical Information
Interconnections
158/182 Controller TV70 Navigator User Manual / 87-900-956-01 (G)
If a continuous signal is applied (pin 5 fixed at +24 V and pin 6 fixed
to ground) the pump speed is set to “Low Speed”. The Low Speed
frequency is settable by window “117” (see “RS232/RS485
Communication Description”).
PROGRAMMABLE ANALOG SIGNAL: this output signal is a voltage
(from 0 to 10 Vdc) linearly proportional to a reference quantity
(frequency or power) set by the user (0V = 0W or 0Hz; 10V = 100W or
1250Hz). The default setting is the frequency.
FAULT: this open collector output signal is closed when a controller
fault condition is detected.
PROGRAMMABLE SET POINT: this open collector output signal is
enabled when the reference quantity chosen (frequency, current or
time) is higher than the set threshold. The signal can be "high level
active" (that is the output is normally at 0 Vdc and becomes 24 Vdc
when activated), or "low level active" (that is the output is normally
at 24 Vdc and becomes 0 Vdc when activated). Moreover, if the
reference quantity is the frequency or the current, it is possible to set
the hysteresis (in % of the threshold value) to avoid bouncing.
For example:
ƒ
reference quantity: frequency
ƒ
threshold: 500 Hz
ƒ
hysteresis: 1%
ƒ activation type: "high level"
ƒ
mask time: 10 sec
Figure 8