Maintenance And Troubleshooting; Maintenance; Troubleshooting; Test The Sensor Circuit And Relay Function - Danfoss VLT PTC Thermistor Card MCB 112 Operating Manual

VLT® PTC Thermistor Card MCB 112
Operating Guide

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

6.2.1 Test the Sensor Circuit and Relay Function

Procedure
1. Test the resistance in the sensor circuit.
The resistance must be 50 Ω <R <1500 Ω. The terminal voltage must be <2.5 V with the resistors attached.
2.
Test the relay function.
If terminal T1-T2 is open, the voltage level of terminal X44/12 changes to low=0. The terminal voltage must be approxi-
mately 9 V.

6.2.2 Alarm/Warning Code List

Table 5: Alarms and Warnings Directly Related to STO
Number Description
68 Safe stop activated
71 PTC 1 safe stop
72 Dangerous failure
Cannot be auto reset via parameter 14-20 Reset Mode.
1

6.2.3 Description of Alarm Word, Warning Word, and Extended Status Word

Table 6: Bit Descriptions
Bit Hex Dec
30 40000000 1073741824
31 80000000 2147483648

6.2.4 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]).

6.2.5 Warning 68, Safe Stop

STO has been activated. To resume normal operation, disable STO.
AUTOMATIC RESTART
When the conditions of the PTC circuit and/or emergency stop circuit have returned to normal, the motor restarts automatically.

6.2.6 Alarm 71, PTC 1 Safe Stop

STO has been activated from the VLT
• 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.
Send a reset signal via bus, digital I/O, or by pressing [Reset].
Danfoss A/S © 2022.08
Warning Alarm/trip
(1)
X X
x x
Alarm word Alarm word2
Safe stop [A68] PTC 1 safe stop [A71]
Dangerous failure [A72]
W A R N I N G
PTC Thermistor Card MCB 112 (motor too warm). Normal operation can be resumed when:
®
Maintenance and Troubleshooting
Alarm/trip lock Parameter reference
(1)
Parameter 5-19 Terminal 37 Safe Stop
Parameter 5-19 Terminal 37 Safe Stop
X
Parameter 5-19 Terminal 37 Safe Stop
Warning word
Safe stop [W68]
AQ267038105120en-000101 / 130R0104 | 27
Warning word2
PTC 1 safe stop [W71]