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Changing the Configuration
To change the Controller configuration:
• Position the desired parameter (menu item) in the display.
• Press the Ë key to initiate an edit session.
• If the console is "locked" you are prompted to enter the passcode.
• The present setting will flash on the display to indicate that you are editing the
parameter.
• Use the È and Í keys to change the value.
• The operation of the Ë and Á varies depends on the type of data being edited.
Note: Once you have initiated an edit session, you must end it before switching to
another mode or invoking another function.
Changing a Numeric Parameter
To change a numeric parameter (e.g. the control setpoint):
• Position the appropriate parameter in the display.
• Press the Ë key to initiate the edit session.
• If the console is "locked" you are prompted to enter the passcode.
• The present value is displayed and the last (rightmost) digit blinks.
• The blinking digit identifies the digit that you are editing.
• Use È or Í to set the desired value.
• Use Á or Ë to move to a different digit.
• To enter a negative value, scroll to the first (leftmost) digit until
a "-" appears in the display.
• Pressing Ë while on the last (rightmost) digit saves the new value.
• Pressing Á while on the first (leftmost) digit ends the edit session without
altering the parameter.
Passcode Protection
The HTC-915 Series Controller provides a passcode for protection of its
configuration. You may view any portion of the configuration with the
console "locked", however, when you attempt to initiate an edit session by
pressing Ë, you are prompted to enter the passcode. A new unit will not be
password protected.
USE OF ThE hTC-915-CONT CONTROLLER WITh AN
OPTIONAL hTC-915-LIM LIMITER
LIMITER CONNECTION DIAgRAM TERMINAL ASSIgNMENTS
To external alarm annunciater /
DCS or PLC input Max 3 A 250V
Heating cable
12 VDC power supply
can be obtained from
HTC-915-CONT
Terminal assignments of the limiter
1.
Digital common (from HTC 13)
2.
+12Vdc out (from HTC 14)
3. RX data (from HTC 15)
4.
TX data (to HTC 16)
5. RTD 1 source
6. RTD 1 sense
7. RTD 2 common
8.
Shield
9.
Control relay output
10. Control relay output
11. Alarm relay output
12. Alarm relay output
13. Load current CT input
14. Load current CT input
PROgRAMMINg ThE LIMITER
In order to protect the settings of the limiter for unwanted changes the user
interface provides some special restrictions.
Changing the Limiter set point
The limiter set point is changed through the user interface of the
HTC-915-CONT in exactly the same manner as for the controller. However, before
the new value will be copied in the limiter memory the user has to press and
release the SHIFT key followed by CONFIG. This additional requirement avoids
unwanted changes of the limiter set point.
Uninstalling the limiter from a hTC-915 control system
Once a limiter is added to the system it can only be removed (from software) by
uninstalling it. This can be done through the Misc. Setup Sub-menu of the HTC-
915-CONT. However, unlike for installing the limiter the user now will need to hit
the SHIFT key before pressing the CONFIG button to confirm the removal of the
limiter.
Limiter Current sensor input
For specific installations the limiter can be configured such that it will allow for
a temperature overshoot as long as there is no current flowing to the heating
system. This would be the case when the high temperature is caused by an
external heat source such as steam cleaning, exothermal processes, etc..
Sensors are permanently monitored for short circuit and cable breakage.
In case an open / short input is detected, the limiter will trip instantaneously.
LIMITER OUTPUTS
Limiter Control output
* Wiring for
Communications
The relay output of the limiter is typically used to operate an external electro
with HTC-915-
mechanical relay (EMR). This relay will in case of excessive over temperature
CONT Controller
isolate the load from the mains supply.
ornitted for clarity
Limiter Alarm output
** Current sensor
optional and not
The limiter alarm output relay will change state (from NC to NO) if
included.
The limiter is powered up the first time after a power outage.
The limiter set point is exceeded and thus the limiter has tripped.
An RTD failure is detected.
A limiter current transformer failure (if the limiter CT is being used) is detected.
Limiter reset
Once the limiter has tripped it has to be reset manually. Resetting the limiter will
only be possible if the actual temperature measured by the Pt100 is below the
limit temperature minus the unit hysteresis.
The limiter can be reset using one of the following methods:
1. From the control panel on the HTC-915-CONT by pressing alarm and SHIFT +
RESET (assuming presence of the digital communication between controller
and limiter).
2. Via pushing and holding the RESET key on the limiter unit for t > 2 seconds.
3. Remotely via the external input of the HTC-915 and a remote contact.
4. Remotely via DCS system. (5 to 24 Vdc).
5. Remotely via the serial interface and the supervisor software.
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