Troubleshooting - Lochinvar ARMOR 101 Series Instructions Manual

8

Troubleshooting

Should you encounter problems communicating over
ModBus, the following items should be checked in this order:
1. Physical Layer
2. Communications Confi guration and Port Settings
3. ModBus Error Codes
4. Unit Status / Blocking / Lockout Codes
Physical Layer
1. Check that all components have power (Unit, Gateway,
BAS Master)
2. Check all wire lengths. Are any drops too long?
3. Check proper shield grounding
4. Check A, B terminal connections
5. Check for Terminating Resistors (120 ohms)
6. Check for broken wires
Communications
1. Check Dip Switch Confi guration of MTR-01 Board
2. Check Baud Rate (9600, 19200, 38200, 76800)
3. Check Parity
4. Check Slave ID
5. Check Port Setting on Master, Gateway, and Computers
ModBus Error Codes
1. Check ModBus communication for error codes (see page
6 for ModBus Exception Codes)
2. Check ModBus PDU
3. Check Slave ID
4. Check ModBus Command
5. Check Confi guration bits for Holding Register 40001
6. Check Commands and data for Holding Registers
40002 - 40007
Unit Status Codes
See Codes in this section
Appliance Status
Th e Armor displays a unit state code on the Building Screen to
help aid in troubleshooting. Th e unit state indicates what the
unit is actually doing. Th is state should be compared to the
command issued and what is expected. If the unit state does
not agree with the command issued, check communication
and confi guration.
22
Status Codes (Input Register 30014 / Analog Input AI13)
2 = Heat Demand blocked due to high outlet temperature
3 = Heat Demand blocked due to high fl ue temperature
4 = Heat Demand blocked due to high Delta T temperature
7 = Heat Demand blocked due to diff erent Personality Plug
code
8 = Heat Demand blocked due to Low 24 VAC
10 = Blocked due to switch OFF (ON/OFF of Display)
16 = Service Mode active
18 = Water Heater DHW Demand active
23 = Heat Demand active from Cascade
30 = Freeze Protection Heat Demand active
32 = DHW Pump Delay active
34 = Standby
40 = Lockout
Blocking Codes (Input Register 30015 / Analog Input AI14)
0 = No blocking is present/active
1 = Blocked Due to Flow Switch open
5 = Blocked Due to a Low 24 VAC supply
6 = Blocked Due to Manual Reset High Limit
8 = Blocked Due to Appliance Turned off
10 = Blocked Due to High Delta T Temperature
11 = Blocked Due to High Outlet Temperature
12 = Blocked Due to Anti-Cycling
13 = Blocked Due to diff erent Personality Plug setting
15 = Blocked due to High Flue Temperatures
ModBus and BACnet Instructions