Ropex RESISTRON RES-5007, Operating Instructions Manual

Page: 15 / 41

Commissioning and operation
Version 1 RES-5007 Page 15
7.2.2 Configuration of the rotary coding switch for temperature range and alloy
This configuration is available as standard.
When the switch position “9” is selected, additional temperature ranges and alloys can be set through the ROPEX
visualisation software (
 see section 8.11 "USB interface for visualisation software ROPEXvisual
®
" on page 27).
7.2.3 Configuration of the alarm output
When the “Alarm output opens with Alarm/PC CONFIGURATION” is selected, additional configurations for the
behaviour of the alarm output can be set through the ROPEX visualisation software (

section 8.11 "USB inter-
face for visualisation software ROPEXvisual
®
" on page 27).
7.3 Changing and burning in the heating element
7.3.1 Burning in the heating element
The heating element is an important component in the control circuit, as it is both a heating element and sensor.
The geometry of the heating element cannot be discussed here due to its diversity. Accordingly, only some impor-
tant physical and electrical characteristics are pointed out here:
The measurement principle used here requires from the heating element alloy a suitable temperature coefficient
TCR, ie an increase in resistance with temperature. A TCR that is too small results in vibrating or overheating of
the heating element.
If the TCR is large, the controller must be calibrated for it. The RESISTRON
®
temperature controller is suitable for
temperature coefficients in the range 400…4000 ppm/K.
The first time it is heated to approx. 200…250 °C, the usual alloy undergoes a one-time change in resistance
(burn-in effect). The cold resistance of the heating element is reduced by about 2…3%. But this small change in
0
5
1
2
3
4
6
7
8
9
AUX
CONF IG URA TIO N
ALARM OU TP UT
ENE RG IZ ED
( ) AT ALARM
- DEE NE RG IZ ED
SWIT CH PO S.
1
0
4
5
8
9
TE MP. RA NGE
300° C
300° C
500° C
500° C
300° C
PC C ONF IGU RA TION
780p pm /K
1100p pm /K
(L)
(A2 0)
1100 pp m/K (A 20)
780p pm /K
350 0ppm /K
(L)
0
5
1 2
3
4
6
7
8
9
Switch
position
0
1
4
5
8
300°C
300°C
500°C
500°C
300°C
1100ppm/K
780ppm/K
1100ppm/K
780ppm/K
3500ppm/K
e.g. Alloy-20
e.g. Alloy L
e.g. Alloy-20
e.g. Alloy L
Temp.
range
Temp.
coefficient
Band
alloy
0 = Factory settings
9 PC-CONFIGURATION
TEM P . CO EFF ICIE NT
0
5
1 2
3
4
6
7
8
9
AU
X
CONF IG URA TIO N
ALARM O UT PU T
ENER GIZ ED
(A T AL AR M )
DE-E NER GIZ ED Alarm output opened
by alarm/
PC-CONFIGURATION
Alarm output closed
by alarm.
(factory setting)