DRAKE MCS-Magnum User manual

www.drakechillers.com
2900 Samuel Drive | Bensalem, PA 19020
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MCS – Magnum
Error / Alarm
Manual

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MCS – Magnum Error / Alarm Manual
Version: 1.0
Table of Contents
General Troubleshooting..............................................................................................1
Microprocessor Features .............................................................................................2
Display Features............................................................................................................3
Unit States .....................................................................................................................4
Unit in Power Up..........................................................................................................4
Scheduled Off..............................................................................................................4
Run / Stop Switch Off...................................................................................................5
Off - No Flow................................................................................................................5
No Run - I/O Lost.........................................................................................................6
Unit is Holding..............................................................................................................6
Unit Unloading .............................................................................................................7
Unit is Loading............................................................................................................. 7
Unit is Unloaded........................................................................................................... 8
Unit is Loaded..............................................................................................................8
Unit in Lockout............................................................................................................. 9
Alarms..........................................................................................................................10
Freeze........................................................................................................................10
Low Suction Superheat.............................................................................................. 11
High Discharge Pressure...........................................................................................12
Low Discharge Pressure............................................................................................13
Low / Unsafe Suction Pressure..................................................................................14
No Flow......................................................................................................................15
Phase Loss................................................................................................................ 16
Emergency Stop ........................................................................................................17
Low Discharge Superheat.......................................................................................... 18
High Discharge Temperature.....................................................................................19
High Motor Temperature / Motor Fault....................................................................... 20
High Motor Amperage................................................................................................ 21
Low Motor Amperage................................................................................................. 22
No Compressor Proof ................................................................................................23
Dirty Filter and Low / Unsafe Oil Differential ..............................................................24

MCS – Magnum Error / Alarm Manual
Version: 1.0
Oil Float...................................................................................................................... 25
Sensor Fault............................................................................................................... 26
Appendices..................................................................................................................26
Appendix A: Magnum Board Troubleshooting............................................................26
Appendix B: Diagnosing Sensor Errors...................................................................... 30
Appendix C: Phase Monitor Faults............................................................................. 36
Appendix D: Enter Password.....................................................................................38
Appendix E: Enable Run / Stop and Reset Emergency Stop.....................................39
Appendix F: Change Date / Time...............................................................................41
Appendix G: Setting Schedules and Holidays............................................................ 42

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1 | Page
MCS – Magnum Error / Alarm Manual
Version: 1.0
1. Before calling Drake, make sure you:
a. Have ready:
i. Chiller’s serial number (located on
the exterior of the chiller, inside the
electrical panel door, and, on the
sticker shown to the right)
ii. Multimeter
iii. Ambient readings, temperature
probes, and pressure transducers
iv. Small flathead screwdriver
v. Laptop, for in-depth diagnostics
using MCS-Connect
vi. An RS-485 to USB cable (shipped
in the manilla folder with the chiller)
b. Check all fuses
c. Check fluids
i. Verify freeze point
ii. Check tank level
d. Make sure unit is correctly wired (no loose
wires) and receiving power matching that
found on the data tag
2. For component locations, refer to the included
wiring and piping diagrams
WARNING!
Make sure to shut down AND disconnect chiller, waiting for ALL
displays or indicator lights to turn off, BEFORE making wiring
changes or replacing fuses
Failure to follow could result in serious injury or death
General Troubleshooting

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2 | Page
MCS – Magnum Error / Alarm Manual
Version: 1.0
Microprocessor Features
Standard Features
•Operates within +/- 0.1°F accuracy
•Powered from chiller 24 VAC (or 12 VDC) control circuit, eliminating high voltage interference
•Can support up to 20 compressors
•Can be set up to use either °F or °C and PSI or Bar
•Can control chiller using inlet or outlet temperature
•Compressor short-cycling reduction to increase compressor lifespan
•Compressor pump-down capability
•Alarm lockouts for chiller protection
•Automatic compressor lead-lag on dual circuit chillers
•Basic chiller functionality for easy setup and operation
•Custom factory configurations
oProgrammable for VFDs
oProgrammable for EC fans
•Two RS-485 serial communication ports and one ethernet port
•Can communicate with Modbus RTU or BACnet/IP
•Wet contact supply for field-installed Run / Stop switch
•Dry contact for alarm output
•Scheduled shutdown capabilities
•Integrates with MCS-Connect, a simple, free to use chiller monitoring computer software
•Custom programmable control logic (call Drake for more information)
•Remote control capabilities
•Expansion boards for additional inputs and outputs
•Can add Gateway Card for BACnet MSTP, LonTalk, and Johnson N2
12 Sensor Inputs
(INPUTS – SI)
RS485 Serial
Communication
24 VAC Input
(optional 12VDC)
10 Relay Outputs
(OUTPUTS - RO)
12 VDC Output
4 Analog Outputs
(OUTPUTS – AO)
4 Digital Inputs
(INPUTS – SI)
Ethernet Port
MCS IO
Magnum Keypad

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MCS – Magnum Error / Alarm Manual
Version: 1.0
Standard Features
•LED-backlit display with a 9-button navigation menu
oDisplays current unit status and lockout alarms
oDisplays full range of sensor inputs, relay outputs, and setpoints
oSuction / discharge pressure and superheat monitoring
oMonitors compressor runtime and cycles per day
•Data logging capabilities, setpoint changes, and sensor calibration
•Alarm history of previous 99 alarms and events
•Capable of extracting data from the last 90 minutes of runtime
•Password authorization for setpoint changes
•NEMA4 gasket seal for extreme weather protection
•Saves operational data of last five alarms
Note
All changes, modifications, and alarm resets
require a supervisor password (2112) to be
entered first
Display Features
LCD Backlit
Display
9 Button
Menu Keypad
ENTER
Button

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MCS – Magnum Error / Alarm Manual
Version: 1.0
A 60-second delay (configurable) during chiller
startup in which all Relay Outputs are shut off and
ensures the board is receiving stable power.
When the unit is shut off due to a user set
schedule, the unit displays this status. In this state,
all relays are disabled, and their statuses will read
“OFF.” The schedule can be viewed or modified in
the Service Tools menu.
Unit in Power Up
1.
Scheduled Off
Magnum Unit States
2.

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MCS – Magnum Error / Alarm Manual
Version: 1.0
This status is displayed when the Run/Stop Switch
has been turned off. In this state, all relays are
disabled, and their statuses will read “OFF.”
To enable the Run/Stop, refer to Appendix E.
This status is displayed when the Flow Switch does
not detect any flow through the evaporator. In this
state, all relays are disabled
until flow is
reestablished, and their statuses will read “OFF.”
Magnum Unit States
Run/Stop Switch
Off
Off – No Flow
3.
4.

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MCS – Magnum Error / Alarm Manual
Version: 1.0
Magnum Unit States
This state is displayed when the connection with
an expansion board (whether a relay or sensor
expansion board) has been lost. The board will
keep trying to reconnect and will display a LOST
I/O RESTART if it reconnects to board. In this
state, all relay outputs except the alarm relay will
be turned off.
This state is displayed when:
- The unit is at the target temperature, and is
maintaining the temperature
- The unit temperature is above the target,
but no additional cooling levels are needed
because Setpoint #27 is satisfied
- The unit temperature is below the target,
but the current level of cooling is adequate
because Setpoint #28 is satisfied
No Run – I/O Lost
Unit is Holding
5.
6.