13
Installation
3
3
3.3 Installing the temperature sensors
The temperature sensor cables must be routed separately from
mains voltage cables, and must not, for example, be routed in the
same cable duct!
Caution
The controller operates with Pt1000 temperature sensors which are accu-
rate to the degree, thus ensuring optimal control of system functions.
Caution
If desired the sensor cables can be extended to a maximum of 30m
using a cable with a cross-section of at least 0.75mm². Make sure
that there is no contact resistance!
Position the sensor precisely in the area to be measured!
Only use immersion, pipe-mounted or
fl
at-mounted sensor suitable
for the speci
fi
c area of application with the appropriate permissible
temperature range.
3.4 Installing the RS485 interface cable
- optional only
A 2-strand twisted-pair cable must be used for the RS485 interface.
The cable must be routed separately from mains voltage cables.
The WPC5 must be equipped with a special additional circuit board
Caution
for the RS485 interface; this board is available as an accessory.
The interface cable for the bus connection is then routed from the WPC5
basic unit to the speci
fi
c EMC... expansion module. This connection is
made on the terminals provided for this purpose; ensure proper polarity (a
/ b). If more than two units are to be connected, the cable must be routed
from one device to another and connected in an open ring.
Caution
The
fi
rst and the last unit in the sequence must be
fi
tted with a
jumper for the RS485 interface. Please consult the installation
instructions for the expansion modules for details.
The controller offers the possibility to display an external error condition
via the S5 sensor input terminals. Similiarly sensor input S4 can be usedto
interlock the heat-pump for a pre-programmed time should an external
error condition arise. Both these functions are achieved by connecting the
sensor inputs to voltage free normally open contacts of external relays.
A short circuit across S4 stops the heat-pump after a programmed blocking
delay and keeps the heat pump locked out until a programmed lock-out
time has elapsed, while a short circuit across S5 shuts down the heat pump
while the short circuit is in place. The relevant error condition is displayed
on the controller screen.
3.5 External error messages and Voltage interlock