6 Maintenance and Troubleshooting
6.1 Maintenance
The devices are maintenance-free. Only the manufacturer
(www.ZIEHL.de) is allowed to perform repair work. Observe
EN 60079-17 Explosive atmospheres - Part 17: Electrical
installations, inspection, and maintenance.
6.2 Troubleshooting
•
The resistance in the sensor circuit must have a
value 50 Ω <R <1500 Ω. The terminal voltage
must be <2.5 V with the resistors attached.
•
If terminal T1-T2 is open, the relay must shut off.
The terminal voltage must be approximately 9 V.
6.2.1 Alarm/Warning Code List
Num-
ber
Descrip-
tion
Warning
Alarm/
Trip
Alarm/
Trip lock
Para-
meter
refe-
rence
68
Safe Stop
Activated
X
X
1)
Parameter
5-19 Termi
nal 37 Safe
Stop
71
PTC 1 Safe
Stop
X
X
1)
Parameter
5-19 Termi
nal 37 Safe
Stop
72
Dangerous
Failure
X
1)
Parameter
5-19 Termi
nal 37 Safe
Stop
Table 6.1 Alarms and Warnings Directly Related to STO
1) Cannot be auto reset via 14-20 Reset Mode.
NOTICE
Alarm 11, Motor Thermistor overtemp.
relates to
1-93 Thermistor Resource
and not to the MCB 112.
6.2.2 Description of Alarm Word, Warning
Word, and Extended Status Word
Bit Hex
Dec
Alarm
word
Alarm
word2
Warning
word
Warning
word2
30
4000
0000
10737
41824
Safe
Stop
[A68]
PTC 1
Safe Stop
[A71]
Safe Stop
[W68]
PTC 1
Safe Stop
[W71]
31
8000
0000
21474
83648
Dangerous
Failure
[A72]
Alarm 68, Safe Stop
STO has been activated. To resume normal operation,
apply 24 V DC to terminal 37, then send a reset signal (via
bus, digital I/O, or by pressing [Reset]).
Warning 68, Safe Stop
STO has been activated. Normal operation is resumed
when STO is disabled.
Warning:
Automatic Restart
.
Alarm 71, PTC 1 Safe Stop
STO has been activated from the MCB 112 (motor too
warm). Normal operation can be resumed when:
•
The MCB 112 applies 24 V DC to terminal 37
again (when the motor temperature reaches an
acceptable level), and
•
The digital input from the MCB 112 is
deactivated.
When that happens, send a reset signal (via bus, digital I/O,
or by pressing [Reset]).
Warning 71, PTC 1 Safe Stop
STO has been activated from the MCB 112 (motor too
warm). Normal operation can be resumed when:
•
The MCB 112 applies 24 V DC to terminal 37
again (when the motor temperature reaches an
acceptable level), and
•
The digital input from the MCB 112 is
deactivated.
Warning:
Automatic Restart
.
Alarm 72, Dangerous Failure
STO with trip lock. If the combination of STO commands is
unexpected, the dangerous failure-alarm is issued. This
situation occurs if the MCB 112 enables X44/10 without
STO being enabled. Furthermore, if the MCB 112 is the
only device using STO (specified by
[4] PTC 1 Alarm
or
[5]
PTC 1 Warning
in
parameter 5-19 Terminal 37 Safe Stop
), an
unexpected combination activates the STO without
activating the X44/10.
Table 6.2
summarises the
unexpected combinations that trigger this alarm.
Maintenance and Troubleshoo...
Operating Instructions
MG33V302
Danfoss A/S © 01/2015 All rights reserved.
19
6
6
