Xylem IM255 AQUAVAR Intelligent Pump Controller - Manual (Page 121)

Troubleshooting
Start up and operation troubleshooting
Table 31: Troubleshooting
Symptom Possible cause Test Solution
Display dark/No function
Missing or open fuses or circuit
breaker tripped
See Pre-startup inspections table
in this manual.
Check the input power source
No power to the LCP Check the LCP cable for proper
connection or damage
Replace the faulty LCP or
connection cable
Shortcut on control voltage
(terminal 12 or 50) or at control
terminals
Check the 24 V control voltage
supply for terminals 12/13 to 20-
39 or 10 V supply for terminals 50
to 55
Wire the terminals properly
Wrong LCP Use only LCP #9K651.
Wrong contrast setting Press [status] + [▲]/[▼] to adjust
the contrast
Display (LCP) is defective Test using a different LCP Replace the faulty LCP or
connection cable
Internal voltage supply fault or
SMPS is defective
Contact supplier
Intermittent display Overloaded power supply (SMPS)
due to improper control wiring or
fault within the frequency
converter
To rule out a problem in the
control wiring, disconnect all
control wiring by removing the
terminal blocks.
If the display stays lit, then the
problem is in the control wiring.
Check the wiring for shorts or
incorrect connections. If the
display continues to cut out, follow
the procedure for display dark.
Motor not running
Service switch open or missing
motor connection
Check if the motor is connected
and the connection is not
interrupted (by a service switch or
other device)
Connect the motor and check the
service switch
No mains power with 24 V DC
option card
If the display is functioning but no
output, check that mains power is
applied to the frequency converter
Apply mains power to run the unit
LCP Stop Check if [Off] has been pressed Press [Auto On] or [Hand On]
(depending on operation mode) to
run the motor
Missing start signal (Standby) Check 5–10 Terminal 18 Digital
Input for correct setting for
terminal 18 (use default setting)
Apply a valid start signal to start
the motor
Motor coast signal active
(Coasting)
Check 5–12 Coast inv. for correct
setting for terminal 27 (use
default setting)
Apply 24 V on terminal 27 or
program this terminal to No
operation
Wrong reference signal source Check reference signals: Local,
remote or bus reference? Preset
reference active? Terminal
connection correct? Scaling of
terminals correct? Reference
signal available?
Program correct settings. Check 3–
13 Reference Site. Set preset
reference active in parameter
group 3–1* References. Check for
correct wiring. Check scaling or
terminals. Check reference signal.
Troubleshooting
Aquavar ® Intelligent Pump Controller INSTRUCTION MANUAL 119