Technical Data; Fault Finding Chart - Grundfos LON Module Instrucciones De Montaje

5. Technical data

Transceiver type FTT - 10.
Recommended cable Unscreened twisted-pair cable.
Transmission speed 78 kBits/s.
Protocol LonTalk
Supply voltage External 24 VDC ±25%, see section 2.2.
Current consumption Maximum 200 mA.

6. Fault finding chart

Before removing the terminal box cover, make sure that the elec-
tricity supply has been switched off and that it cannot be acciden-
tally switched on.
Fault Cause
The pump One fuse in the installation
does not run. is blown.
None of the in-
External mains switch
dicator lights
switched off.
are on.
Current-/voltage-operated
earth-leakage circuit
breaker has tripped out.
Missing phase (only three-
phase pumps).
The pump is defective.
The basic module or the
LON module is defective.
The pump The pump has been stopped
does not run. in one of the following ways:
The green indi-
1. External on/off switch in
cator light is
position off.
flashing.
2. Via BUS signal.
The red indica-
tor light is off.
The pump The pump is running with
runs. wrong direction of rotation
The green and (only three-phase pumps).
red indicator
lights are on.
The basic module has lost
its data.
8

.
Remedy
Replace the fuse.
Switch on the mains switch.
Repair insulation defects and cut in the
circuit breaker.
Check fuses and connections.
Repair or replace the pump.
Repair or replace the defective
module.
1. Switch on the on/off switch.
2. Start the pump via BUS signal.
Switch off the electricity supply by
means of the external mains switch
and interchange two phases in the ter-
minal box.
Replace the basic module.