CONNECTION DIAGRAM
TERMINAL ASSIGNMENTS
SHIF T
TEST
BACK
ENTER
MONITOR
ALARM
CONFI G
ALAR M
OUTPU T
915 SERIES HEA T-TRACING CONTROLLER
Tx
Rx
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
30 29 28 27 26 25 24 23 22 21 20 19 18 17
Gr
ound fault C
T input
1 t
o 0.001 A
Load C
T input 100 t
o 0.1 A
SSR out
Alarm output
NO or NC
Contr
ol r
ela
y output
100 t
o 250 V
ac / 277 V
ac.
(+10 / –10%)
- +
Connection t
o limiter
RS 485 comm
Ext input
TS2
(optional)
TS1
Alarm output relay
CE/EAC: Relay contact rated 3 A/250 Vac, 50/60 Hz
CSA: Relay contact rated 3A/277Vac, 50/60 Hz
Output is user programmable to open or to close on alarm.
Power output
12 Vdc, 200 mA max.
TEMPERATURE SENSOR
Type
100 Ω platinum Pt 100, 3-wire, α = 0.00385 Ω/°C. Can be extended with a three core
shielded cable of maximum 20 Ω lead resistance per conductor.
Quantity
2 RTD inputs available
COMMUNICATIONS
Protocol
Modbus RTU or ASCII
Topology
Multidrop/daisychain
Cable
Single shielded twisted pair, 0.5 mm
2
(24 AWG) or larger
Length
Typical 2.7 km max @ 9600 Baud
Quantity
Up to 32 devices
Address
Programmable
For technical support call nVent or write an E-mail to [email protected]
FUNCTIONAL OVERVIEW
The nVent RAYCHEM HTC-915 is a full featured temperature control system for
heattracing applications.
Power supply
100 to 250V
±10% at 50/60Hz
(also used
for voltage
measurements)
2 three wire
PT100 inputs
HTC-915
Controller
Digital
communication
Configuration
and set-up
Software (RS485)
Control
Relay output
(250V/277V/3A)
Current
Transformer
Load current
Control
Solid state output
(0 – 12Vdc)
Alarm output
(relay 250V/277V/3A)
Configurable to open
or to close on alarm
Current
Transformer
Earth leakage current
Scrolling display
Current
Transformer
Load current
3-wire PT100
input
HTC-915
Limiter
Alarm output
(relay 250V/277V/3A)
NC opening on alarm
Trip
Relay output
(250V/277V/3A)
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