Digital Output (Do) Modules - Eaton Crouse-Hinds Series Instruction Manual

62
DRAFT - 22 March 2018
8 .2

Digital Output (DO) modules

Apply tests per channel.
8 .2 .1 Loop powered: - MTL4521 & MTL4521L, MTL4521Y & MTL4523L
Figure 8 .2:
Loop powered
V
DO test circuit
1. Connect a voltmeter between the + & – output terminals of the module, observing polarity.
2. Apply 24V between the supply terminals (Vs+, Vs–)
3. The voltmeter should indicate a value between 21.4 and 24 volts
4. Switch off the power to the module
5. Connect an ammeter between the + & – output terminals of the module, observing
polarity
6. Apply 24V between the supply terminals (Vs+, Vs–)
7. The ammeter should indicate no less than 48mA (or 70mA for MTL4621)
8 . 2 . 2 Powered: - MTL4523, MTL4523R, MTL4523V, MTL4523VL, MTL4523Y, MTL4524 & MTL4524S
& MTL4525
Figure 8 .3:
Powered
DO test circuit
V
1. Connect a voltmeter between the + & – output terminals of the module, observing polarity
2. Apply 24V between the supply terminals Vs+, Vs–
3. The voltmeter should now indicate no more than 4V
4. Close the Control switch or, for the MTL4523V ot MTL4523VL apply the 24V source
5. The voltmeter should now indicate a value between 21.4 and 24 volts
6. Switch off the power to the module
7 . Connect an ammeter between the + & – output terminals of the module, observing polarity
8. Apply 24V between the supply terminals (Vs+, Vs–)
9. Close the Control switch or, for the MTL4523V or MTL4523VL apply the 24V source
10. The ammeter should indicate no less than 48mA (or 70mA for equivalent MTL4600 models)
8 .2 .3 Relay: - MTL4526
Figure 8 .4:
DO test circuit
for relay type
1. Set in 2-channel mode (SW1 - SW4 respectively to Off, On, On, On)
2. Confirm continuity between NC and Common
3. Apply 24V between the supply terminals Vs+, Vs–
4. Close the Control switch
5. Confirm continuity between NO and Common
+
o/p i/p
A
–
+
A i/p
o/p
–
NO
o/p
NC
Common
Vs–
Vs+
MTL4523V/VL
+
+
Control 24V
–
–
+
Control
i/p
–
INM 4500/4600 Rev 12