2 4 Power Wiring
2 4 Power Wiring
1
9
2
10
3
11
4
12
5
13
6
14
7
15
8
16
The controller is supplied to operate at 11-28 VAC / VDC or 90-264VAC.Check
that the installation voltage corresponds with the power rating indicated on the
product label before connecting power to the controller.
The controller is supplied to operate at 11-28 VAC / VDC or 90-264VAC.Check
that the installation voltage corresponds with the power rating indicated on the
product label before connecting power to the controller.
90
264 VAC or
11
28 VAC / VDC
~
~
Fuse
Figure 2.4
Power Supply Connections
Figure 2.4
Power Supply Connections
This equipment is designed for installation in an enclosure which provides
adequate protection against electric shock. The enclosure must be connected
to earth ground.
Local requirements regarding electrical installation should be rigidly obser ved.
Consideration should be given to prevent from unauthorized person access to
the power terminals.
This equipment is designed for installation in an enclosure which provides
adequate protection against electric shock. The enclosure must be connected
to earth ground.
Local requirements regarding electrical installation should be rigidly obser ved.
Consideration should be given to prevent from unauthorized person access to
the power terminals.
2 5 Sensor Installation Guidelines
2 5 Sensor Installation Guidelines
Proper sensor installation can eliminate many problems in a control system.
The probe should be placed so that it can detect any temperature change
with minimal thermal lag. In a process that requires fairly constant heat
output, the probe should be placed closed to the heater. In a process where
the heat demand is variable, the probe should be closed to the work area.
S o m e e x p e r i m e n t s w i t h p r o b e l o c a t i o n a r e o f t e n r e q u i r e d t o f i n d t h i s
optimum position.
In a liquid process, addition of a stirrer will help to eliminate thermal lag.
Since the thermocouple is basically a point measuring device, placing more
than one thermocouple in parallel can provide an average temperature
readout and produce better results in most air heated processes.
P r o p e r s e n s o r t y p e i s a l s o a v e r y i m p o r t a n t f a c t o r t o o b t a i n p r e c i s e
measurements. The sensor must have the correct temperature range to
meet the process requirements. In special processes the sensor might need
to have different requirements such as leak-proof, anti-vibration, antiseptic,
etc.
Standard sensor limits of error are +/-4degrees F (+/- 2degrees C ) or 0.75%
of sensed temperature (half that for special ) plus drift caused by improper
protection or an over-temperature occurrence. This error is far greater than
controller error and cannot be corrected on the sensor except by proper
Proper sensor installation can eliminate many problems in a control system.
The probe should be placed so that it can detect any temperature change
with minimal thermal lag. In a process that requires fairly constant heat
output, the probe should be placed closed to the heater. In a process where
the heat demand is variable, the probe should be closed to the work area.
S o m e e x p e r i m e n t s w i t h p r o b e l o c a t i o n a r e o f t e n r e q u i r e d t o f i n d t h i s
optimum position.
In a liquid process, addition of a stirrer will help to eliminate thermal lag.
Since the thermocouple is basically a point measuring device, placing more
than one thermocouple in parallel can provide an average temperature
readout and produce better results in most air heated processes.
P r o p e r s e n s o r t y p e i s a l s o a v e r y i m p o r t a n t f a c t o r t o o b t a i n p r e c i s e
measurements. The sensor must have the correct temperature range to
meet the process requirements. In special processes the sensor might need
to have different requirements such as leak-proof, anti-vibration, antiseptic,
etc.
Standard sensor limits of error are +/-4degrees F (+/- 2degrees C ) or 0.75%
of sensed temperature (half that for special ) plus drift caused by improper
protection or an over-temperature occurrence. This error is far greater than
controller error and cannot be corrected on the sensor except by proper
UM9300 2.0
UM9300 2.0
17