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Trouble shooting
6. Trouble shooting
6.1 PRC487 error messages
If a fault occurs, the MEDICS
causes. Some messages can have several causes. The following possible errors are indicated
by messages in the PRC487 display.
If you cannot trigger a test function on the PRC487, an alarm message may already be pend-
ing, or there may be an open circuit at terminal 9-Ub of the PRC487.
PRC message
Failure line 1
Failure line 2
Failure distribution
board
Failure K3
K1/2 manual mode Contactor control has been changed to manual mode. Auto-
Short-circuit distri-
bution board
Wire break K1 on
Wire break K1 off
Wire break K2 on
Wire break K2 off
Fault K1 on
Fault K1 off
Fault K2 on
Fault K2 off
Failure K1
TGH1322en/06.2009
All manuals and user guides at all-guides.com
®
system messages will enable you to narrow down the possible
Possible causes
Power supply failure on line 1. SUE487 failure. Open circuit, ter-
minal 6-GND3. Defective fuse 1-L1, 1-L2.
Power supply failure on line 2. SUE487 failure. Open circuit, ter-
minal 5-GND3. Defective fuse 2-L1, 2-L2.
Power supply failure downstream of the changeover module.
SUE487 failure. Open circuit terminal 4-GND3
Failure of the internal relay K3 (SUD487). Open circuit terminal
IN3-GND3
matic changeover will no longer be performed!
Short-circuit downstream of changeover module. Following a
failure on line 1 and changeover to line 2, line 2 drops out and
voltage is present on line 1 again.
Open circuit when controlling K1 via terminals 11/14 of the
PRC487, auxiliary contact K2 or resistor R1.
Open circuit when controlling K1 via terminals 21/24 of the
PRC487 for the purpose of shutting down the latching module.
Open-circuit when controlling K2 via terminals 31/34, auxiliary
contact K1 or resistor R2.
Open circuit when controlling K2 via terminals 41/44 of the
PRC487 for the purpose of shutting down the latching module.
K1 cannot be activated. K1 is jammed. Open circuit, auxiliary
contact at terminal GND1 or IN1 of PRC487.
K1 cannot be switched off via latching module. K1 is jammed.
Open circuit, auxiliary contact at terminal GND1 or IN1 of
PRC487.
K2 cannot be activated. K2 is jammed. Open circuit, auxiliary
contact at terminal GND2 or IN2 of PRC487.
K2 cannot be deactivated via latching module. K2 is jammed.
Open circuit, auxiliary contact at terminal GND2 or IN2 of
PRC487.
K1 on, but no voltage downstream of K1. Open circuit, main
contacts K1 or line upstream or downstream of K1. SUE487 fail-
ure.
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