Ropex RESISTRON RES-5009, User Manual, Page: 35 / 98

Device functions
Version 1 RES-5009 Page 35
9.3.4 Warning active (WA)
The WA bit can be set in addition to the AL bit. If the WA bit is set, the current alarm is a warning. In this case, the
alarm relay is not active.
9.3.5 Temperature reached (TE)
The TE bit is set when the actual temperature has reached 95% of the setpoint temperature. As soon as the con-
trol mode is ended (Start request = 0) or an alarm occurs (AL bit = 1), this status bit will be reset again.
9.3.6 Temperature OK (TO)
The RESISTRON
®
Temperature Controller RES-5009 checks whether the actual temperature lies within a set-
table “good window” tolerance band around the setpoint temperature. The lower ( ) and upper ( )
tolerance band limit can be changed separately through the parameter data (  section 9.4 "Parameter data" on
page 37). The following settings are possible:
1.
“Off”
The TO bit is always reset.
2. “active when Tact = Tset” (factory setting)
The TO bit is set when the actual temperature is within the set temperature monitoring band. If the actual tem-
perature is outside the monitoring band, the TO bit is reset (see following graphic).
The actual temperature is hereby evaluated independently of the control mode, in contrast to the “Temperature
reached” (TE bit) status bit.
3. “Active when Tact = Tset”, with latch function
A welding cycle begins with setting the start request (ST bit).
The TO bit is set if the actual temperature reaches the temperature monitoring band for the first time within a
welding cycle. If the start request is still active and the monitoring band is left again, the TO bit will be reset (see
Image a.). If the start request is still active and the actual temperature no longer leaves the monitoring band,
the TO bit will not be reset until the start of the next welding cycle (latch function, see Image b.). The switching
status of the TO bit can thus be queried after resetting of the ST bit and before the start of the next welding
cycle.
Δϑ
unten
Δϑ
oben
Setpoint
Set-
Δϑ
unten
Set-
Δϑ
oben
Actual value
Time
Time
0
1
TO bit