Danfoss iC7 Series Design Manual page 115

Design Guide | iC7 Series Liquid-cooled System Modules
Table 42: Maintenance Schedule for Liquid-cooled Drives (continued)
Component Inspection
interval
Insulator gaskets 1 year
Batteries 1 year
Spare parts
Spare parts 1 year
Exchange units 1 year
Coolant
Log Commissio
ning/startu
p, or when
replacing
coolant
Glycols 1 year
Corrosive in- 1 year
hibitors
Pre-mixed coolant 1 year
with glycol and in-
hibitor
Demineralized 1 year
water
Liquid-cooling system
Pipes, hoses, and 1 year
connections
Leak detector 1 year
Danfoss Drives Oy © 2024.03
Service Preventive maintenance actions
(1) (2)
schedule
10–15 Inspect the insulators for signs of degradation due to high temperature and ag-
years 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.
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.
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.
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.
– 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.
Based on Measure and record the level of glycol in the cooling system. The minimum con-
findings centration level is always 75/25% demineralized water/glycol.
Based on Measure and record the level of Danfoss recommended corrosive inhibitor (Cortec-
findings 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.
Based on The pre-mixed coolants contain specific percentages of glycol and inhibitor for
findings 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.
Based on Only use demineralized or deionized water in the coolant solution. Record and
findings compare the chemical composition values when replacing or adding coolant.
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.
10 years Test the functioning of the leak detector.
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