Metasys-Adapter_Inst..

Metasys-Adapter_Inst..
Installation Guide
Bacharach Communications Adapter
HGM-MZ to Johnson Controls’ Metasys N2 Network
(Electrically Isolated N2 Port Version)
621 Hunt Valley Circle
New Kensington, PA 15068
Tel:
724-334-5000
Fax: 724-334-5001
1.
Instruction 3015-5514
Revision 1
October 2012
Introduction
The Bacharach HGM-MZ to Johnson Metasys N2 Communications Adapter enables an HGM-MZ Refrigerant
Monitor to communicate with a Metasys building management system. The following may be viewed on
Metasys operator stations.
• Zone PPM readings
• Flow status
• Refrigerant selections
• HGM internal health.
In addition, each HGM zone supports three levels of alarming through Metasys.
• Leak
• Spill
• Evacuate
Each alarm threshold can be set through Metasys.
The N2 Communications Adapter can be used in conjunction with the MZ-RD Remote Display if desired.
Wiring details and operational limitations when using the MZ-RD are discussed below.
CAUTION: The adapter is powered from the 120/240V Universal Power Supply connection on
the HGM main board. 120/240V is present on the lower left corner of this adapter within the
area shown on the board silkscreen. Keep fingers away from this area when HGM is powered.
2.
Adapter Installation Inside HGM-MZ
The communications adapter board will normally be installed in the HGM-MZ at the factory. It can, however,
be field installed by following the instructions below.
The following installation materials are needed for field installation of the adapter:
• Qty (5)
6-32 x ¼” screws (standard finish)
Rev 1 (P/N 3015-5514)
1
HGM-MZ to N2 Communications Adapter
Step
1.
2.
3.
Description
The adapter board mounts on the rear of the HGM-MZ enclosure door. Position the adapter board
over the five standoffs on the door and install with 6-32 fasteners through the board and into the
standoffs.
Connect power wiring from the HGM-MZ’s 120/240V Universal Power Supply terminal block to the
adapter board’s POWER terminal block. Use UL approved wire. Wire polarity does not matter.
If an MZ-RD remote display is NOT used with the adapter, refer to Figure 1 for wiring details. In this
case, all wiring between the HGM-MZ and the only external cable is the N2 communications cable.
4.
If an MZ-RD remote display IS to be used with the adapter, refer to Figure 2 for wiring details. Note
that when the MZ-RD is used, TWO RS-485 cables must be run between the HGM-MZ and MZ-RD,
so plan accordingly.
5.
In either case, be sure to set the HGM-MZ’s internal “terminator” slide switch next to the RS-485
terminal block to the “In” position.
Figure 1 – Wiring w/o Remote Display
2
Rev 1 (P/N 3015-5514)
HGM-MZ to N2 Communications Adapter
Figure 2 – HGM-MZ to N2 Communications Adapter: Wiring w/Remote Display
3.
Field Hookup of N2 Communications
The “BAS BUS” (N2) RS-485 communications port on the adapter is electrically isolated from the HGM-MZ
and from earth ground. This prevents problems with potential differences in “ground” between physically
separate locations.
Connect the N2 ‘+’ wire to the BAS BUS N+ terminal block screw. Connect the N2 ‘-‘ wire to the BAS BUS
N- terminal block screw. Connect the N2 REF wire to the BAS BUS REF terminal block screw. Shield
connection practices vary. Refer to Johnson Controls Metasys N2 documents for Johnson-recommended
practices. Options are to hard-terminate the shield to the case, soft-terminate (through a small-value capacitor)
the shield to the case, or leave the shield floating.
If the adapter is the last device on the N2 line, the RS-485 TERM jumper just below the BAS BUS terminal
block should be installed. Otherwise leave the RS-485 TERM jumper disconnected.
Rev 1 (P/N 3015-5514)
3
HGM-MZ to N2 Communications Adapter
4.
Setting the HGM Communications Address on the Adapter
See Figure 3 for the location of adapter DIP switches A and B. Switches 5-8 on the adapter’s ‘A’ DIP switch
are used to match the node address set on the HGM’s address DIP switch (on the HGM main board). Values
from 0-15 are possible. Refer to the table that follows.
Figure 3 – HGM-MZ to N2 Communications Adapter: DIP Switches
4
Rev 1 (P/N 3015-5514)
HGM-MZ to N2 Communications Adapter
HGM
Addr
A5
A6
A7
A8
HGM
Addr
A5
A6
A7
A8
0
Off
Off
Off
Off
8
On
Off
Off
Off
1
Off
Off
Off
On
9
On
Off
Off
On
2
Off
Off
On
Off
10
On
Off
On
Off
3
Off
Off
On
On
11
On
Off
On
On
4
Off
On
Off
Off
12
On
On
Off
Off
5
Off
On
Off
On
13
On
On
Off
On
6
Off
On
On
Off
14
On
On
On
Off
7
Off
On
On
On
15
On
On
On
On
Switch Positions
Switch Positions
Since the HGM is the only node on the adapter-to-HGM interface, address 1 is normally used. Be sure to set
the same address on the adapter and the HGM main board DIP switches.
5.
Configuring the HGM-MZ with MZ-RD or Laptop PC
The only HGM parameters that are changeable through Metasys are the alarm thresholds. Configuring the
HGM for refrigerant type and length of tubing for each zone (zero length to disable a zone) must be done with
the MZ-RD remote display or a laptop PC. Refer to the appropriate Bacharach instructions for configuring
these items. HGM’s are commonly custom-configured at the factory per the customer’s needs, so field
configuring these parameters may not be necessary.
If configuring the HGM-MZ with an MZ-RD, the communications adapter’s presence will not affect the
standard configuration procedure. If configuring with a laptop PC, temporarily disconnect the HGM-MZs
RS-485 cable from the adapter until configuration is complete and the laptop is disconnected.
Rev 1 (P/N 3015-5514)
5
HGM-MZ to N2 Communications Adapter
6. Setting the Metasys N2 Address on the Communications Adapter Board
Switches 1-8 on the adapter’s ‘B’ DIP switch are used to set the Metasys N2 node address. Possible addresses
are 1-255. Use the following technique to set switches B1-B8.
Step
Description
1.
Divide the desired N2 address by 16.
2.
Take the integer part of the result (0-15) and use the following table to set switches B1-B4.
B1
B2
B3
B4
N2 Address
Upper Half
B1
B2
B3
B4
0
Off
Off
Off
Off
8
On
Off
Off
Off
1
Off
Off
Off
On
9
On
Off
Off
On
2
Off
Off
On
Off
10
On
Off
On
Off
3
Off
Off
On
On
11
On
Off
On
On
4
Off
On
Off
Off
12
On
On
Off
Off
5
Off
On
Off
On
13
On
On
Off
On
6
Off
On
On
Off
14
On
On
On
Off
7
Off
On
On
On
15
On
On
On
On
3.
Take the value 0-15 from above and multiply that times 16.
4.
Subtract the result from the desired N2 address.
5.
This gives another number 0-15. Use this number and the table to set switches B5-B8.
Example:
6
N2 Address
Upper Half
N2 Address
Lower Half
B5
B6
B7
B8
N2 Address
Lower Half
B5
B6
B7
B8
0
Off
Off
Off
Off
8
On
Off
Off
Off
1
Off
Off
Off
On
9
On
Off
Off
On
2
Off
Off
On
Off
10
On
Off
On
Off
3
Off
Off
On
On
11
On
Off
On
On
4
Off
On
Off
Off
12
On
On
Off
Off
5
Off
On
Off
On
13
On
On
Off
On
6
Off
On
On
Off
14
On
On
On
Off
7
Off
On
On
On
15
On
On
On
On
Desired N2 address:
Divide by 16:
Integer part of answer:
Use table entry for ‘2’ to set B1-B4:
Multiply 2 (from above) by 16:
Subtract result (32) from desired address:
Use table entry for ‘3’ to set B5-B8:
35
(35 ÷ 16) = 2.1875
2
B1=Off
B2=Off
(2 x 16) = 32
(35-32) = 3
B5=Off
B6=Off
B3=On
B4=Off
B7=On
B8=On
Rev 1 (P/N 3015-5514)
HGM-MZ to N2 Communications Adapter
7.
Alarm Acknowledge Options
Two alarm acknowledge options are supported. DIP switch A1 on the adapter board selects which alarm
acknowledge option is used.
•
•
Auto Acknowledge
Manual Acknowledge
(A1 On)
(A1 Off)
In the Auto Acknowledge mode, the HGM-MZ will clear its alarm outputs the next time the alarmed zone is
sampled and its PPM has dropped below the alarm thresholds. No intervention from the Metasys network is
necessary.
In the Manual Acknowledge mode, the HGM-MZ will never clear its alarm outputs until the Metasys network
connection has acknowledged the Change-of-State alarms reported to Metasys. Once Metasys has
acknowledged the alarm messages, the HGM will clear its alarm outputs the next time the alarmed zone is
sampled and its PPM has dropped below the alarm thresholds. Please note that the Metasys acknowledgement
is a field-level acknowledgement that takes place automatically (typically within a few seconds). It is not a
human operator acknowledging that the alarm was seen on a console. The Metasys acknowledgement does,
however, mean that the system has caught the alarm and that it will be reported to some higher level.
8.
Setting up the Metasys Database
The Metasys Point Map included with this document will provide the information needed to set up AI (analog
input), BI (binary input), and ADI (internal integer) points in the Metasys database. Additional comments are
provided below to supplement the map. The HGM-MZ can support up to 16 zones in groups of 4 zones, but a
particular HGM-MZ may not have all zones installed. It is not necessary to include points in the Metasys
database for zones that are not installed in the HGM-MZ.
Each monitored zone in the HGM supports three levels of alarming: Leak, Spill, Evacuate. Since the Metasys
N2 architecture does not support three different levels of high alarming per AI point, each HGM zone is set up
as THREE AI points. The first AI point for a zone supports a Leak Alarm, the second AI point for a zone
supports a Spill Alarm, and the third AI point for a zone supports an Evacuate Alarm. All three AI points for a
zone return the same PPM reading, it’s the alarm thresholds that differ.
Alarm thresholds in PPM are set through Metasys by setting each AI point’s “High Alarm Limit.” Each alarm
threshold may be set to a value of 1-65535 PPM. Please note that for a particular zone, the Spill threshold must
be set higher than the Leak threshold, and the Evacuate threshold must be set higher than the Spill threshold.
All Metasys warning/alarm limits other than “High Alarm Limit” are ignored. Because the HGM samples
slowly, alarm “differential” to prevent alarm chattering is not needed. Therefore the Metasys “Differential”
parameter for each AI may be written but will be ignored.
Certain HGM faults will cause various points to be marked unavailable/unreliable. For example, a global flow
fault will cause ALL AI PPM values to be marked unreliable, whereas a flow fault on a single zone will only
cause the three AI PPM values associated with that zone to be marked unreliable. Note that any time power is
cycled to the HGM, it goes through a 15-minute warm-up cycle (even if it was already warm!). During this
time, all AI PPM values will be marked unreliable. Don’t cycle HGM power needlessly if you would like to get
valid PPM readings with the next 15 minutes!
There are several ADI points which can provide useful information such as type of refrigerant programmed for
each zone, number of zones actually installed in the HGM, the number of zones in alarm, HGM operating
mode, etc.
Rev 1 (P/N 3015-5514)
7
HGM-MZ to N2 Communications Adapter
9. Communications LED Indicators
The communications adapter board has four LED communications status indicators numbered 1-4. The
meanings of these indicators are shown below. See Figure 3 for the locations of the communications LED
indicators.
LED
Adapter
Function
1
Tx
Adapter is transmitting a poll/command to the HGM-MZ
2
Rx
Adapter is receiving a response from the HGM-MZ
3
Tx
Adapter is transmitting a response to Metasys N2 (because poll/command was directed to this slave)
4
Rx
Adapter is receiving a poll/comm from Metasys N2 (directed to ANY N2 slave, not necessarily this one)
Meaning When LED Is in the “ON” State
Under normal conditions, you would expect to see a lot of activity on LED 4 since the N2 master is continually
polling all N2 slaves on the line. LED 3 will show activity based on how often the N2 master is polling the
adapter (versus other N2 slaves on the line). If there are few N2 slaves on the line, a lot of polls will be directed
to the adapter and LED 3 will blink frequently and LED 3 will blink less frequently.
LED 1 and LED 2 will only show occasional activity. Since the refrigerant monitoring process is fairly slow
and new data is only available every 15 seconds or so, the adapter polls the HGM at a slow rate to reduce the
communications burden on the HGM main processor.
Figure 4 – HGM-MZ to Metasys N2 Adapter: Communications LEDs
8
Rev 1 (P/N 3015-5514)
HGM-MZ to N2 Communications Adapter
10. Operating Limitations When Using MZ-RD Remote Display
When an MZ-RD remote display is used, the N2 network will have access to the HGM-MZ as long as the MZRD is in either the SYSTEM or ZONE VIEW screen. If the MZ-RD is set to display any other screen, it will
respond to polls from the N2 adapter with an HGM BUSY exception code. The N2 adapter will handle the
exception by marking most points as Unavailable and setting the Unavailable Reason point = HGM Busy.
When the MZ-RD is returned to the SYSTEM or ZONE VIEW screen, normal N2 monitoring will resume.
If the operator leaves the MZ-RD in some screen other than SYSTEM or ZONE VIEW for an extended period
of time (10 minutes default), the MZ-RD times out and automatically returns to either the SYSTEM or ZONE
VIEW screen. This will restore normal N2 monitoring.
11. Miscellaneous Notes
RS-485 communications wires ARE polarity sensitive. If the adapter does not communicate on the N2 RS-485
port, try swapping the communications wires on the N+ and N- terminal block screws. The HGM port uses the
same labels as the HGM main board, so if you match the wires to the labels, polarity should not be an issue
there.
If the adapter seems to not be functioning correctly, it can be restarted without restarting the HGM simply by
pressing the CPU RST button just below the “A” DIP switch. If you restart the adapter by cycling the HGM’s
power, you will have to wait for the HGM’s 15-minute warm-up cycle to end before PPM readings are
available! If restarting the adapter alone doesn’t help, try cycling power to the entire HGM.
When the adapter software first starts, it attempts to establish communications with the HGM before attempting
to communicate on the N2 port. Do not be concerned after cycling power or pressing CPU RST that no N2
activity is shown on the LEDs immediately. The software delays about 20 seconds after a restart before
attempting to establish N2 communications.
The LEDs are driven by adapter software states, not by the RS-485 hardware. If an RS-485 connection stops
working in the middle of receiving a message, the RX LED may stay on indefinitely until the connection starts
working again.
∇ ∇ ∇
Rev 1 (P/N 3015-5514)
9
HGM-MZ to N2 Communications Adapter
Headquarters:
621 Hunt Valley Circle, New Kensington, PA 15068-7074
Toll Free: 1-800-736-4666 • Tel: +1-724-334-5000 • Fax: +1-724-334-5001
Website: www.MyBacharach.com • E-mail: [email protected]
Printed in U.S.A.
10
® Registered Trademark of Bacharach Inc.
Rev 1 (P/N 3015-5514)
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