Bench Testing Modules; Digital Input (Di) Modules - Eaton MTL5501-SR Instruction Manual

8
The following methods have been devised to permit the user to perform simple module tests
on the bench and confirm basic input to output operation. Field units that do not perform as
described below, or modules that have 'unusual' operating behaviour, should be replaced and
returned to Eaton.
Consult individual module wiring diagrams for terminal connections.
Unless stated specifically, the module will require dc power, as if under normal
operating conditions.
8 .1
8 .1 .1
Input Conditions
1.
2. For multi-channel modules with LFD, connect a 22kΩ resistor across the other channel
3. Where appropriate test with phase reversal switch in both OFF and ON conditions.
Figure 8 .1:
DI input
test circuit
Model
MTL5501-SR
Table 8 .1:
MTL5510/5510B
Input test MTL5511
conditions MTL5513
MTL5514/5514D
MTL5516C
MTL5517
Output Results
1.
2. The phase reversal switch will reverse the channel output conditions, but not the LFD.
3. With LFD disabled (OFF) the Status LED should respond as shown in Table 8.2.
4. With LFD disabled (ON) the LEDs and relay should respond as shown in Table 8.3.
Table 8 .2:
Output test
results
60

BENCH TESTING MODULES

Digital Input (DI) modules

Modules: MTL 5501-SR, MTL5510, MTL5510B, MTL5511, MTL5513, MTL5514(-T),
MTL5514D, MTL5516C, MTL5517
Connect the appropriate input test circuit to the channel under test (see Figure 8 .1 &
Table 8 .1).
input(s) to prevent the signalling of an unwanted open-circuit line fault.
Resistor values
R = 10kΩ,
1
R = 22kΩ,
1
For MTL5510 and MTL5510B modules refer to pages 13-15 of this manual.
Channel contacts
Input switch
positions
NC
a Closed
b Open
c Open
d Closed
Channel contacts
Input switch
positions
NC
a Closed
b Open
c Closed
d Closed
+
R
1 a
b
–
R
c
2
d
Switch – simulation conditions
R = 1k4Ω
2
a) Normal - field switch open
b) Normal - field switch closed
R = 680Ω
c) Line Fault - Test for short circuit
2
d) Line Fault - Test for open circuit
Status
LED
NO
Open OFF
Closed ON
Closed ON
Open OFF
LEDs
NO Status LFD
Open OFF OFF
Closed ON OFF
Open OFF ON
Open OFF ON
LFD relay
MTL550x MTL551x
Energised De-energised
Energised De-energised
De-energised Energised
De-energised Energised
INM 5500 Rev 10