DRAKE MCS-MicroMag User manual

www.drakechillers.com
2900 Samuel Drive | Bensalem, PA 19020
[phone] | [phone]
MCS – MicroMag
Error / Alarm
Manual

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MCS – MicroMag Error / Alarm Manual
Version: 02/21/2020
Table of Contents
General Troubleshooting .........................................................................1
Microprocessor Features.........................................................................2
Display Features.......................................................................................3
Unit States.................................................................................................4
PowerUpDelay.........................................................................................4
OFF SCHEDULE .....................................................................................4
OFF RUN/STOP ......................................................................................5
COOLING ................................................................................................5
MACH LOCKOUT....................................................................................6
PUMP ONLY............................................................................................6
Alarms .......................................................................................................7
Supply Freeze..........................................................................................7
Low Suction Superheat............................................................................8
High Discharge Pressure.........................................................................9
Low Discharge Pressure........................................................................10
Low / Unsafe Suction Pressure..............................................................11
No Flow..................................................................................................12
Phase Loss............................................................................................13
No Battery..............................................................................................14
Sensor Fault...........................................................................................15
Appendices .............................................................................................16
Appendix A: Cooling States....................................................................16
Appendix B: Diagnosing Sensor Errors..................................................17
Appendix C: Phase Monitor Faults.........................................................21
Appendix D: Enter Password and Enable Run / Stop.............................23
Appendix E: Change Date / Time...........................................................25
Troubleshooting Notes...........................................................................27

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1 | Page
MCS – MicroMag Error / Alarm Manual
Version: 02/21/2020
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 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 – MicroMag Error / Alarm Manual
Version: 02/21/2020
Microprocessor Features
Standard Features
•Operates within +/- 0.1°F accuracy
•Powered from chiller 24 VAC (or 12 VDC) control circuit, eliminating high voltage
interference
•Dual-circuit control capability
•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-845 serial communication ports
•Can communicate with Modbus RTU or BACnet MSTP
•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
10 Sensor Inputs
(INPUTS – SI)
RS485 Serial
Communication
24 VAC Input
(optional 12VDC)
2A 250V
Mini Fuse
6 Relay Outputs
(OUTPUTS - RO)
5 A 250V
Mini Fuse
12 VDC Output
4 Analog Outputs
(OUTPUTS – AO)

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MCS – MicroMag Error / Alarm Manual
Version: 02/21/2020
Standard Features
•LED-backlit display with a 6-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
Note
Any and all changes, modifications, and alarm
resets require a supervisor password (2112) to be
entered first
Display Features
LCD Backlit
Display
6 Button
Menu Keypad

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MCS – MicroMag Error / Alarm Manual
Version: 02/21/2020
A 60-second delay 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.
PowerUpDelay
1.
OFF SCHEDULE
MicroMag Unit States
2.

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MCS – MicroMag Error / Alarm Manual
Version: 02/21/2020
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 D.
When the fluid inlet or outlet temperature sensor
reads a value higher than the value of Setpoint #8
(CWIN/OUT Target), the unit displays this state and
is starting to or is currently running in order to drop
the fluid temp below the setpoint. For cooling sub-
states, refer to Appendix A.
MicroMag Unit States
OFF RUN/STOP
COOLING
3.
4.

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MCS – MicroMag Error / Alarm Manual
Version: 02/21/2020
This state is entered whenever a critical situation
is encountered that could cause harm tothe chiller.
In this state, all RelayOutputs except the alarm are
turned off and will read “LOCKOUT.”
Lockouts can be reset from the keypad or with the
MCS-Connect program; however, if the lockout
condition has not been corrected, the system will
again be forced into this state.
Note - If the Lockout Reset is used more than 6
times in one day, the unit cannot be reset except
with Factory authorization. Call Drake for support.
This state is entered when all compressors have
been shut down, either due to normal operating
conditions or due to a lockout, and only the chilled
fluid pump is running.
MicroMag Unit States
MACH LOCKOUT
PUMP ONLY
5.
6.

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MCS – MicroMag Error / Alarm Manual
Version: 02/21/2020
This alarm will trip if the fluid out temperature drops
below the value of Setpoint #86. The chiller will
lockout and all Relay Outputs will be disabled to
avoid damage to the chiller.
Note: Supervisor password (2112) is
required to reset lockouts
Possible Causes
Solutions
Sensor fault on fluid out See Appendix B to troubleshoot
Setpoint #86 is incorrect
for operating conditions
Change setpoint to a lower value
IMPORTANT! If supply fluid is water, do NOT change setpoint to a
value lower than 40°F (4.5°C) as the liquid may freeze and cause
severe damage to the chiller!
Ambient temperature is
cold enough to affect
fluid temperatures
Verify insulation thickness is suitable for the lowest ambient
operating temperature
Add more glycol to lower freezing point, and then adjust Setpoint
#86 accordingly
Lack of flow through the
evaporator
Check that all valves are opened and that
there are no blockages or restrictions in the y-
strainer (shown to the right) or process
plumbing
Supply Freeze
MicroMag Alarms
1.