Design Guide | iC7 Series Liquid-cooled System Modules
Table 42: Maintenance Schedule for Liquid-cooled Drives (continued)
Component Inspection
interval
(1)
Service
schedule
(2)
Preventive maintenance actions
Insulator gaskets 1 year 10–15
years
Inspect the insulators for signs of degradation due to high temperature and ag-
ing. Replacement is based on findings or done at the same time as DC capacitor re-
placement. Only trained service personnel are allowed to perform this action.
Batteries 1 year 7–10 years Replace the batteries according to the manufacturer recommendation. Replace the
real-time clock battery in the control unit every 7–10 years.
Spare parts
Spare parts 1 year 2 years Stock spares in their original boxes in a dry and clean environment. Avoid hot stor-
age areas. Electrolytic capacitors require reforming as stated in the service sched-
ule. The reforming must be performed by trained service personnel.
Exchange units 1 year 2 years Visually inspect for signs of damage, water, high humidity, corrosion, and dust
within the visual field of view without disassembly. The exchange units with
mounted electrolytic capacitors require reforming as stated in the service schedule.
The reforming must be performed by trained service personnel.
Coolant
Log Commissio
ning/startu
p, or when
replacing
coolant
– To create a baseline for future reference before and after adding inhibitor and gly-
col, record the water quality specification values. Also, record the system pressure,
coolant flow rate, and temperature range.
Glycols 1 year Based on
findings
Measure and record the level of glycol in the cooling system. The minimum con-
centration level is always 75/25% demineralized water/glycol.
Corrosive in-
hibitors
1 year Based on
findings
Measure and record the level of Danfoss recommended corrosive inhibitor (Cortec-
VpCI-649) in the liquid coolant (see specification). Measure the level of the inhibitor
every year. If the inhibitor level is below the recommended level of 1%, add more
inhibitor. Before adding more inhibitor, practice caution not to exceed the level of
electrical conductivity.
Pre-mixed coolant
with glycol and in-
hibitor
1 year Based on
findings
The pre-mixed coolants contain specific percentages of glycol and inhibitor for
antifreeze and corrosion protection. The advantage of using a pre-mixed coolant
is that the chemical composition is within Danfoss specifications, and there is no
need for analyzing the coolant.
Demineralized
water
1 year Based on
findings
Only use demineralized or deionized water in the coolant solution. Record and
compare the chemical composition values when replacing or adding coolant.
Liquid-cooling system
Pipes, hoses, and
connections
1 year 1 year Check for external signs of moisture, corrosion, and coolant leaks. Check the tight-
ness of the cooling pipe connections. Check the heat sinks and host pipes in the
cooling system.
Leak detector 1 year 10 years Test the functioning of the leak detector.
Danfoss Drives Oy © 2024.03 AJ475942178716en-000101 / 172K2848A | 115
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