Dwyer MTL5045 - Manual (Page 16)

12 INM5000-6 Jul 2010
6.1.2 Testing
Make the safe- and hazardous-area connections shown in figure 6.2
and check status LEDs and relay contacts as follows:
6.2 MTL5011B single-pole changeover
relay single-channel switch/
proximity detector with line fault
detection and phase reversal
The MTL5011B is similar to the MTL5011 but with added line fault
detection (LFD) facilities.
6.2.1 Wiring connections
See figure 6.3 for wiring connections.
Note: Reactive loads must be adequately suppressed.
6.2.2 Line fault detection
(See section 3.1.4 for definition of a line fault)
Input line faults (open- or short-circuit) are indicated by an LED and the
de-energising of the output relay. LFD is enabled/disabled by a switch
located on top of the module. Note that if the LFD facility is enabled for
switch inputs, the resistors shown in figures 6.3 and 6.4 MUST be fitted.
6.2.3 Testing
Make the safe- and hazardous-area connections shown in figure 6.4
and check the status of the output contacts as shown in table 6.1
Table 6.1
6.3 MTL5012 solid-state single-channel
switch/proximity detector with line
fault detection and phase reversal
The MTL5012 enables a safe-area load to be controlled, through a solid-
state output, by a switch or proximity detector in a hazardous area. Line
fault detection (LFD) and output phase reversal (see 3.1.3) facilities are
included.
Input Phase Status Relay
switch reverse switch LED contacts
Closed Normal On Closed
Closed Reverse Off Open
Open Normal Off Open
Open Reverse On Closed
Vs–
Vs+
20 to 35V dc
+
–
3
2
1
6
5
4 7
8
9
10
11
12
13
14
Phase Input Output Output Channel Line fault
reverse Line fault switch relay relay LED LED
switch detection (SW) (11-12) (10-11) (yellow) (red)
Normal Off a Closed Open On Off
Reverse Off a Open Closed Off Off
Reverse Off Open Closed Open On Off
Normal On Open Open Closed Off On
Normal On a Open Closed On On
Normal On b Open Closed Off Off
Normal On c Closed Open On Off
Terminal Function
1 Input –ve
2 Input +ve
3 Earth leakage detection
10 Normally-closed contact
11 Common
12 Normally-open contact
13 Supply –ve
14 Supply +ve
6
5
4
3
2
1
7
8
9
10
11
12
13
14
Vs–
Vs+
20 to 35V dc
Ch1
To earth
leakage
detector
SW
Ch1
22kW
680W
a
b
c
+
–
Figure 6.2: Test circuit for MTL5011
Figure 6.4: Test circuit for MTL5011B
6
5
4
3
2
1
7
8
9
10
11
12
13
14
Vs–
Vs+
20 to 35V dc
Outpu
To earth
leakage
detector
22kW
680W
+
–
Resistors required only
for line fault detection
Figure 6.3: MTL5011B wiring diagram and connections
Hazardous area Safe area