Rockwell Automation 7000L PowerFlex Medium Voltage AC Drive (C-Frame) - ForGe Control - Manual (Page 340)

340 Rockwell Automation Publication 7000L-UM301D-EN-P - June 2014
Chapter 5 Component Definition and Maintenance
4. Open valves V8 and V9 (if provided) after cleaning. The high
conductivity warning will stop once the conductivity decreases to its
normal level.
Reservoir Circuit
The reservoir is a cross-linked, polyethylene 57 L(15 gal) container. Level switch
LS (see
Figure 283 ) is a warning switch that annunciates when the fluid drops
down below the first level switch.
Level switch LSDL (see Figure 283 ) triggers the drive and cooling pumps to shut
down when the fluid drops below critical level.
Fluid Top-up
Keep the coolant at the proper level in the reservoir. There are two float switches
within the reservoir: one indicates a low coolant level (LS-alarm) and requires a
top-up of the fluid, and the other indicates a very low coolant level (LSDL-trip)
and triggers a shut down of the drive. De-ionized water and chloride-free
ethylene glycol or a mixture of the two may be added to the reservoir. Use the
200 L(55 gal) barrel to mix coolant and/or to premix the de-ionized water and
glycol. Check the freeze protection concentration with a glycol tester and add
fluid accordingly. Add coolant by pouring it into the top of the reservoir.
Strainers
Cleaning the Pump Suction Strainer (if provided)
1. Open valve V1, shown in Figure 285 , to ensure flow to the pumps.
2. Close valve V2 and V3. Loosen strainer by hand. Clean it properly in water
and dry it before putting it back.
3. Open V2 and V3 slowly to avoid a rush of air into the pumps. The air will
gradually be purged from the system by flowing through the reservoir.
4. Close valve V1.
IMPORTANT Pour the coolant slowly into the reservoir to avoid disturbing the coolant level
switches and causing a trip fault.