I have used a 24v power pack from Jaycar on both my EM200 and EM400 mounts. Slewing speed increases with 24v.
The one I bought is a 24v, 2 amp switchmode, MP-3244 but I think they're discontinued.
You should be ok using your 24v, just check your DC polarity.
My mounts accept the centre +.
(sorry about the bad photo)
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