Terminal assignments
for the controller
1. RTD 1 source
2. RTD 1 sense
3. RTD 1 common
4. Shield
5. RTD 2 source
6. RTD 2 sense
7. RTD 2 common
(Inhibit/override)
9. External Input –
(Inhibit/override)
10. Communications
11. Communications
12. Shield
13. Digital common (to
Limiter 1)
14. +12Vdc out
(to Limiter 2)
15. TX data (to Limiter 3)
16. RX data
(from Limiter 4)
23. PE
24. SSR control output +
25. SSR control output –
26. Load Current CT input
27. Load Current CT input
29. GF CT input
30. GF CT input
Terminal assignments
of the limiter
1. Digital common
(from HTC 13)
2. +12Vdc in (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 1 common
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
17. Mains Input (L1)
neutral)
19. Control relay output
20. Control relay output
21. Alarm relay output
22. Alarm relay output
Alarm availability
An alarm can be generated if the actual measured value is
higher or lower than the value specified in the controller’s
set-up. Alarms are available for:
temperature, voltage, current, power, earth leakage current,
etc… refer to HTC-915 operating manual for details. A copy of
this manual can be downloaded from nVent.com (Doc-2106)
OPERATOR CONSOLE & OPERATION
ALPHA-NUMERIC DISPLAY
The Console incorporates LED display. Messages and
prompts that are greater than 6 characters long are scrolled.
KEYPAD
The local keypad consists of 6 keys that allow you to select
the console mode function. For certain keys, the SHIFT key
selects an alternate function, as shown by the text above
Quick Notes on Operation
Basic rules for efficient Console use:
• use the SHIFT key followed by the appropriate function
key -- ALARM,
MONITOR, or CONFIG -- to select the operating mode
• use Íand to move around in the menu
• use Ëto enter a new menu, enter a new value, or
select a menu item
• use Áto exit the current menu or cancel an edit
Key Function
SHIFT • Press to activate a SHIFT function -- the
next key pressed uses the alternate
(shifted) function.
• The SHIFT LED illuminates, indicating
the next key uses the alternate (shifted)
function pressing SHIFT again cancels the
alternate (shifted) function.
TEST • Turns on tracing for 30 seconds when
prefixed by the SHIFT key, this key
switches the console to the Alarm mode.
ÁBACK
[shift
MONITOR]
• Exits the current menu (or cancels the
new setting when editing a parameter).
• Moves the cursor to the left when editing
an alpha-numeric parameter.
• When prefixed by the SHIFT key, this
key switches the console to the Monitor
mode.
ËENTER
[shift
CONFIG]
• Selects the item in the display (or accepts
the setting when editing a parameter).
• Moves the cursor to the right when editing
an alpha-numeric parameter.
• When prefixed by the SHIFT key, this key
switches the console to the Configure
mode.
• Moves to the previous item in a menu
increments the value when editing.
• Moves to the next item in a menu
decrements the value when editing.
LED INDICATORS
The console includes eight LED indicators:
Four LEDs indicate the Console operating mode.
(SHIFT function, ALARM, MONITOR, or CONFIGure modes).
There are two status LED’s which indicate the alarm and
control output status of the controller:
The output LED, the alarm LED will flash
(approximately once per second) when the controller has
detected an alarm condition. The two additional LEDs are
used to indicate external communications activity.
nVent.com | 4
